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Contents Wiring diagrams Section: Anti-Lock/traction Control All sections

Antilock Brake System Chevrolet Express G2500

Anti-Lock/traction Control 6 illustrations ~17186 words

Fastener Tightening Specifications

ApplicationSpecification
MetricEnglish
BPMV Bracket Bolt25 N.m18 lb ft
BPMV Shield Bolt25 N.m18 lb ft
BPMV Shield Nut25 N.m18 lb ft
Brake Pipe Fitting25 N.m18 lb ft
Brake Pressure Modulator Valve (BPMV) Bolt11 N.m97 lb in
Electronic Brake Control Module (EBCM) Bolt3 N.m27 lb in
Wheel Speed Sensor Bolt- Front18 N.m13 lb ft
Wheel Speed Sensor Bolt- Rear14 N.m124 lb in
Yaw Rate Sensor with Lateral Accelerometer Nut9 N.m80 lb in

Fastener Tightening Specifications

Scheme 1

Scheme 1: Power, Ground, Serial Data, Speed Signals and Indicators (JL9) Wiring Schematics
Scheme 1: Power, Ground, Serial Data, Speed Signals and Indicators (JL9) Wiring Schematics

Scheme 2

Scheme 2: Power, Ground, Serial Data, Indicators and Traction Control Switch (JL4) Wiring Schematics
Scheme 2: Power, Ground, Serial Data, Indicators and Traction Control Switch (JL4) Wiring Schematics

Scheme 3

Scheme 3: Speed Signals (JL4) Wiring Schematics
Scheme 3: Speed Signals (JL4) Wiring Schematics

Scheme 4

Scheme 4: StabiliTrak Steering Wheel Position Inputs and Yaw and Lateral Accelerometer Sensor (JL4) Wiring Sch
Scheme 4: StabiliTrak Steering Wheel Position Inputs and Yaw and Lateral Accelerometer Sensor (JL4) Wiring Sch

Diagnostic Code Index

DTCDescription
DTC B2745DTC B2745 Traction Control Switch Circuit
DTC C0035-C0050 (With JL4)DTC C0035 02 Left Front Wheel Speed Sensor Circuit Short to Ground DTC C0035 05 Left Front Wheel Speed Sensor Circuit Short to Battery or Open DTC C0035 0F Left Front Wheel Speed Sensor Circuit Erratic Signal DTC C0035 18 Left Front Wheel Speed Sensor Circuit Signal Amplitude Less Than Minimum DTC C0040 02 Right Front Wheel Speed Sensor Circuit Short to Ground DTC C0040 05 Right Front Wheel Speed Sensor Circuit Short to Battery or Open DTC C0040 0F Right Front Wheel Speed Sensor Circuit Erratic Signal DTC C0040 18 Right Front Wheel Speed Sensor Circuit Signal Amplitude Less Than Minimum DTC C0045 02 Left Rear Wheel Speed Sensor Circuit Short to Ground DTC C0045 05 Left Rear Wheel Speed Sensor Circuit Short to Battery or Open DTC C0045 0F Left Rear Wheel Speed Sensor Circuit Erratic Signal DTC C0045 18 Left Rear Wheel Speed Sensor Circuit Signal Amplitude Less Than Minimum DTC C0050 02 Right Rear Wheel Speed Sensor Circuit Short to Ground DTC C0050 05 Right Rear Wheel Speed Sensor Circuit Short to Battery or Open DTC C0050 0F Right Rear Wheel Speed Sensor Circuit Erratic Signal DTC C0050 18 Right Rear Wheel Speed Sensor Circuit Signal Amplitude Less Than Minimum
DTC C0035 or C0040 (With JL9)DTC C0035 01 Left Front Wheel Speed Sensor Circuit Short to Ground DTC C0035 04 Left Front Wheel Speed Sensor Circuit Open DTC C0035 05 Left Front Wheel Speed Sensor Circuit Short to Battery or Open DTC C0035 0F Left Front Wheel Speed Sensor Circuit Signal Erratic DTC C0035 26 Left Front Wheel Speed Sensor Circuit Signal Frequency Too Low DTC C0040 01 Right Front Wheel Speed Sensor Circuit Short to Ground DTC C0040 04 Right Front Wheel Speed Sensor Circuit Open DTC C0040 05 Right Front Wheel Speed Sensor Circuit Short to Battery or Open DTC C0040 0F Right Front Wheel Speed Sensor Circuit Signal Erratic DTC C0040 26 Right Front Wheel Speed Sensor Circuit Signal Frequency Too Low
DTC C0055 or P0609DTC C0055 05 Rear Wheel Speed Sensor Circuit Short to Battery or Open DTC C0055 0F Rear Wheel Speed Sensor Circuit Erratic DTC C0055 26 Rear Wheel Speed Sensor Circuit Frequency Too Low DTC P0609 Vehicle Speed Output Circuit
DTC C0110 (With JL9)DTC C0110 04 Pump Motor Circuit Open Circuit DTC C0110 61 Pump Motor Circuit Actuator Stuck
DTC C0110 (With JL4)DTC C0110 04 Pump Motor Circuit Open Circuit DTC C0110 61 Pump Motor Circuit Actuator Stuck
DTC C0131 (With JL9)DTC C0131 01 Antilock Brake System (ABS)/Traction Control System (TCS) Pressure Circuit Short to Battery DTC C0131 04 ABS/TCS Pressure Circuit Short to Ground or Open DTC C0131 5A ABS/TCS Pressure Circuit Plausibility Failure
DTC C0131 (With JL4)DTC C0131 01 Antilock Brake System (ABS)/Traction Control System (TCS) Pressure Circuit Short to Battery DTC C0131 06 ABS/Traction Control System (TCS) Pressure Circuit Short to Ground or Open DTC C0131 0F ABS/Traction Control System (TCS) Pressure Circuit Erratic DTC C0131 55 ABS/Traction Control System (TCS) Pressure Circuit Expected Number of Transition/Events Not Reached DTC C0131 5A ABS/Traction Control System (TCS) Pressure Circuit Plausibility Failure DTC C0131 61 ABS/Traction Control System (TCS) Pressure Circuit Actuator Stuck
DTC C0161 (With JL4)DTC C0161 5A Antilock Brake System (ABS) Brake Switch Circuit Plausibility Failure
DTC C0161 (With JL9)DTC C0161 62 Antilock Brake System (ABS) Brake Switch Actuator Stuck Open DTC C0161 63 Antilock Brake System (ABS) Brake Switch Actuator Stuck Closed
DTC C0179DTC C0179 54 System Thermal Temperature High
DTC C0186 or C0196DTC C0186 55 Lateral Accelerometer Circuit Expected Number of Transition/Events Exceeded DTC C0186 5A Lateral Accelerometer Plausibility Failure DTC C0186 0F Lateral Accelerometer Circuit Erratic DTC C0196 55 Yaw Rate Circuit Expected Number of Transition/Events Exceeded DTC C0196 5A Yaw Rate Plausibility Failure DTC C0196 0F Yaw Rate Circuit Erratic
DTC C0201 (With JL4)DTC C0201 01 Antilock Brake System (ABS) Enable Relay Contact Circuit Short to Battery DTC C0201 04 Antilock Brake System (ABS) Enable Relay Contact Open Circuit
DTC C0201 (With JL9)DTC C0201 01 Antilock Brake System (ABS) Enable Relay Contact Circuit Short to Battery DTC C0201 04 Antilock Brake System (ABS) Enable Relay Contact Circuit Open
DTC C0242 or P0856DTC C0242 75 Engine Control Module (ECM) Indicated TCS Malfunction Signal Above Allowable Range DTC P0856 Traction Control Torque Request Circuit
DTC C0245DTC C0245 00 Wheel Speed Sensor Frequency Error DTC C0245 5A Wheel Speed Sensor Frequency Plausibility Failure
DTC C0292DTC C0292 02 VSES Combination Sensor Circuit Short To Ground DTC C0292 07 VSES Combination Sensor Circuit Voltage Above Threshold
DTC C0558DTC C0558 46 Calibration Data Not Programmed/Learned, vehicle configuration not programmed
DTC C0561DTC C0561 71 System Disabled Information Stored Invalid Serial Data Received invalid serial data received DTC C0561 72 System Disabled Information Stored Invalid Serial Data Received alive counter incorrect/ not updated DTC C0561 74 System Disabled Information Stored Invalid Serial Data Received Value of Signal Protection Calculation Incorrect
DTC C0710DTC C0710 17 Steering Position Signal Shape/Waveform Failure DTC C0710 55 Steering Position Signal Expected Number of Transitions/Events not Reached DTC C0710 5A Steering Position Signal Plausibility Failure DTC C0710 0F Steering Position Signal Erratic

DIAGNOSTIC CODE INDEX

Diagnostic Instructions

  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Diagnostic Fault Information

CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
TCS Switch Signal CircuitB27451
1. Traction control cannot be manually disabled.

Circuit/System Description

The driver may disable the Traction Control System by pressing the traction control switch. The body control module (BCM) supplies a 12 volt signal on the traction control signal circuit. When the traction control switch is pressed, this voltage signal is grounded.

Conditions for Running the DTC

Ignition ON.

Conditions for Setting the DTC

The BCM detects low voltage on the traction control signal circuit for 60 seconds.

Action Taken When the DTC Sets

  1. The BCM sends a serial data message to the electronic brake control module (EBCM) informing the EBCM that the desired TCS state cannot be determined.
  2. A driver information center message and/or warning message may be displayed.

Conditions for Clearing the DTC

  1. The condition for the DTC is no longer present.
  2. The EBCM clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Reference Information

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  4. «Wiring Repairs»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information.

Circuit/System Verification

Ignition ON, observe the scan tool BCM Traction Control Switch parameter while pressing and releasing the Traction Control Switch. The reading should change between Active and Inactive.

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the traction control switch.
  2. Test for less than 5 ohms between the ground circuit terminal C and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify the scan tool Traction Control Switch State parameter is Active. If not the specified value, test the signal circuit terminal F for a short to ground. If the circuit tests normal, replace the BCM.
  4. Install a 3A fused jumper wire between the signal circuit terminal F and the ground circuit terminal C. Verify the scan tool Traction Control Switch State parameter is Inactive. If not the specified value, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the BCM.
  5. If all circuits test normal, test or replace the traction control switch.

Component Testing

  1. Ignition OFF, disconnect the harness connector at the traction control switch.
  2. Test for infinite resistance between the signal terminal F and the ground terminal C with the switch in the open position. If not the specified value, replace the traction control switch.
  3. Test for less than 3 ohms between the signal terminal F and the ground terminal C with the switch in the closed position. If greater than the specified range, replace the traction control switch.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Electronic Traction Control Switch Replacement»(/chevrolet/express-g2500/2013-2013/remont/anti-locktraction-control/#antilock-brake-system)
  2. «Control Module References»(/chevrolet/express-g2500/2013-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Left Front Wheel Speed Sensor SignalC0035 02C0035 05C0035 05C0035 0F, C0035 18
Right Front Wheel Speed Sensor SignalC0040 02C0040 05C0040 05C0035 0F, C0035 18
Left Rear Wheel Speed Sensor SignalC0045 02C0045 05C0045 05C0045 0F, C0045 18
Right Rear Wheel Speed Sensor SignalC0050 02C0050 05C0050 05C0045 0F, C0045 18
Left Front Wheel Speed Sensor Low ReferenceC0035 02C0035 05C0035 05C0035 0F, C0035 18
Right Front Wheel Speed Sensor Low ReferenceC0040 02C0040 05C0040 05C0040 0F, C0040 18
Left Rear Wheel Speed Sensor Low ReferenceC0045 02C0045 05C0045 05C0045 0F, C0045 18
Right Rear Wheel Speed Sensor Low ReferenceC0050 02C0050 05C0050 05C0050 0F, C0050 18
ComponentConditionDTCs
Left Front Wheel Speed SensorPhysical damage Debris on the wheel speed sensor or the encoder ring Loose or improperly mounted sensor Loose or worn wheel bearing Air gap between the wheel speed sensor and the encoder ring too largeC0035 0F, C0035 18
Right Front Wheel Speed SensorPhysical damage Debris on the wheel speed sensor or the encoder ring Loose or improperly mounted sensor Loose or worn wheel bearing Air gap between the wheel speed sensor and the encoder ring too largeC0040 0F, C0040 18
Left Rear Wheel Speed SensorPhysical damage Debris on the wheel speed sensor or the encoder ring Loose or improperly mounted sensor Loose or worn wheel bearing Air gap between the wheel speed sensor and the encoder ring too largeC0045 0F, C0045 18
Right Rear Wheel Speed SensorPhysical damage Debris on the wheel speed sensor or the encoder ring Loose or improperly mounted sensor Loose or worn wheel bearing Air gap between the wheel speed sensor and the encoder ring too largeC0050 0F, C0050 18

The wheel speed sensor receives ignition voltage from the electronic brake control module (EBCM) and provides a square wave signal back to the module. As the wheel spins, the EBCM uses the frequency of the square wave signal to calculate the wheel speed.

C0035 02 and 05-C0050 02 and 05

Ignition ON.

C0035 18-C0050 18

  1. Ignition ON.
  2. No other wheel speed circuit DTCs are set.
  3. The brake pedal is not pressed.
  4. Two or three other wheel speeds are greater than 0 km/h (0 MPH).

C0035 0F-C0050 0F

  1. Ignition ON.
  2. The brake pedal is not pressed.
  3. A DTC is not set for the other wheel speed circuit on the same axle.

C0035 02-C0050 02

A short to ground is detected on the wheel speed signal circuit or low reference circuit.

C0035 05-C0050 05

A short to voltage, or an open is detected on the signal circuit or low reference circuit.

C0035 0F-C0050 0F

  1. A missing wheel speed sensor signal
  2. An erratic signal output of the wheel speed sensor is detected three times in 200 milliseconds.
  3. The EBCM detects a change in wheel speed that exceeds 20 km/h (12 MPH) between two 10 millisecond wheel speed samples. This must be detected three times in 200 milliseconds.

Actions Taken when the DTC Sets

  1. The EBCM disables the ABS and stabilitrak for the duration of the ignition cycle.
  2. A driver information center message and/or a warning indicator may be displayed.
  1. The condition for setting the DTC is no longer present.
  2. The EBCM clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Diagnostic Aids

  1. Inspect the routing of the rear wheel speed sensor harness. The harness should NOT wrap around the brake hose.
  2. Check the wiring and terminal crimps at the rear wheel speed sensor connectors X 413 and X 414.
  3. If the customer comments that the ABS indicator is ON only during moist environmental conditions: rain, snow, vehicle wash, etc., inspect the wheel speed sensor wiring for signs of water intrusion.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  4. «Wiring Repairs»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Observe the scan tool Wheel Speed Sensor parameter. The reading should be the same speed on all sensors when driving in a straight line at a speed greater than 20 km/h (13 MPH).

  1. Ignition OFF, disconnect the harness connector at the EBCM.
  2. Test for less than 1 V between the low reference circuit terminal of the appropriate sensor listed below and ground: Left front sensor circuit terminal 29 Right front sensor circuit terminal 6 Left rear sensor circuit terminal 5 Right rear sensor circuit terminal 2 If greater than the specified value, test the low reference circuit for a short to voltage.
  3. Ignition ON, test for less than 1 V between the signal circuit terminal of the appropriate sensor listed below and ground: Left front sensor circuit terminal 28 Right front sensor circuit terminal 17 Left rear sensor circuit terminal 4 Right rear sensor circuit terminal 3 If greater than the specified value, test the signal circuit for a short to voltage.
  4. Test for infinite resistance between the following low reference circuit terminal of the appropriate sensor listed below and ground: Left front sensor circuit terminal 29 Right front sensor circuit terminal 6 Left rear sensor circuit terminal 5 Right rear sensor circuit terminal 2 If less than the specified value, test the low reference circuit for a short to ground.
  5. Ignition OFF, test for infinite resistance between the signal circuit terminal of the appropriate sensor listed below and ground: Left front sensor circuit terminal 28 Right front sensor circuit terminal 17 Left rear sensor circuit terminal 4 Right rear sensor circuit terminal 3 If less than the specified value, test the signal circuit for a short to ground.
  6. Ignition OFF, disconnect the harness connector at the appropriate wheel speed sensor.
  7. Test for less than 2 ohms between the appropriate signal circuit terminals listed below: Left front sensor circuit terminal 28 at the EBCM harness connector, and terminal B at the wheel speed sensor harness connector Right front sensor circuit terminal 17 at the EBCM harness connector, and terminal B at the wheel speed sensor harness connector Left rear sensor circuit terminal 4 at the EBCM harness connector, and terminal B at the wheel speed sensor harness connector Right rear sensor circuit terminal 3 at the EBCM harness connector, and terminal B at the wheel speed sensor harness connector If greater than the specified value, test the signal circuit for an open or high resistance.
  8. Test for less than 2 ohms between the appropriate low reference circuit terminals listed below: Left front sensor circuit terminal 29 at the EBCM harness connector, and terminal A at the wheel speed sensor harness connector Right front sensor circuit terminal 6 at the EBCM harness connector, and terminal A at the wheel speed sensor harness connector Left rear sensor circuit terminal 5 at the EBCM harness connector, and terminal A at the wheel speed sensor harness connector Right rear sensor circuit terminal 2 at the EBCM harness connector, and terminal A at the wheel speed sensor harness connector If greater than the specified value, test the low reference circuit for an open or high resistance.
  9. If all circuits test normal, replace the appropriate wheel speed sensor. If the DTC resets, replace the EBCM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Wheel Speed Sensor Replacement (AWD)»(/chevrolet/express-g2500/2013-2013/remont/anti-locktraction-control/#antilock-brake-system)
  2. «Rear Wheel Speed Sensor Replacement»(/chevrolet/express-g2500/2013-2013/remont/anti-locktraction-control/#antilock-brake-system)
  3. «Control Module References»(/chevrolet/express-g2500/2013-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for EBCM replacement, programming and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Left Front Sensor SignalC0035 01C0035 04, C0035 05C0035 05C0035 0F, C0035 26
Right Front Sensor SignalC0040 01C0040 04, C0040 05C0040 05C0040 0F, C0040 26
Left Front Sensor Low ReferenceC0035 04, C0035 05C0035 05C0035 0F, C0035 26
Right Front Sensor Low ReferenceC0040 04, C0040 05C0040 05C0040 0F, C0040 26
ComponentConditionDTCs
Left Front Wheel Speed SensorPhysical damage Debris on the wheel speed sensor or the encoder ring Loose or improperly mounted sensor Loose or worn wheel bearing Air gap between the wheel speed sensor and the encoder ring too largeC0035 0F, C0035 26
Right Front Wheel Speed SensorPhysical damage Debris on the wheel speed sensor or the encoder ring Loose or improperly mounted sensor Loose or worn wheel bearing Air gap between the wheel speed sensor and the encoder ring too largeC0040 0F, C0040 26

Mechanical Conditions

The wheel speeds are detected by passive wheel speed sensors. The wheel speed sensor receives a 5 V reference and a low reference from the electronic brake control module (EBCM) and provides a AC signal back to the module. As the wheel spins, the EBCM uses the frequency of the signal to calculate the wheel speed.

  1. The ignition is ON.
  2. Ignition voltage is greater than 10 V.

C0035 01-C0040 01

A short to ground is detected on the wheel speed 5 V reference circuit.

C0035 04-C0040 04

High resistance is detected on the wheel speed 5 V reference or low reference circuit.

C0035 05-C0040 05

A short to voltage, or an open is detected on 5 V reference or the low reference circuit.

C0035 0F-C0040 0F

  1. An erratic signal output of the wheel speed sensor is detected 3 times in 200 milliseconds.
  2. The EBCM detects a change in wheel speed that exceeds 20 km/h (12 mph) between two 10 millisecond wheel speed samples. This must be detected 3 times in 200 milliseconds.
  3. A missing wheel speed sensor signal

C0035 26-C0040 26

An erratic signal output of the wheel speed sensor.

  1. The EBCM disables the Antilock Brake System (ABS) and Traction Control System (TCS) for the duration of the ignition cycle.
  2. A driver information center message and/or a warning indicator may be displayed.
  1. The condition for setting the DTC is no longer present.
  2. The EBCM clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

If the customer comments that the ABS indicator is ON only during moist environmental conditions such as rain, snow, or a vehicle wash; then inspect the wheel speed sensor wiring for signs of water intrusion. If the DTC is not current, clear all DTCs and simulate the effects of water intrusion. Test drive the vehicle over various road surfaces such as bumps and turns, above 40 km/h (25 mph) for at least 30 seconds.

  1. Inspect the back of the wheel bearing on the encoder surface for metal debris that could cause an erratic reading with the sensor. Do not use a magnet to clean the debris, or damage to the encoder ring may occur.
  2. If both of the wheel speed sensors are inoperative diagnose each wheel speed sensor individually.
  3. If the ABS, traction control and/or stabilitrak telltales are ON with no DTCs set, after repairs are made, and DTCs are cleared, operate the vehicle at speeds greater than 15 km/h (10 mph) to complete the self test, and the EBCM should turn off the ABS indicator.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  4. «Wiring Repairs»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, observe the scan tool Wheel Speed Sensor parameter. The reading should be the same speed on all sensors when driving in a straight line at a speed greater than 20 km/h (13 mph).

  1. Ignition OFF, disconnect the harness connector at the EBCM.
  2. Ignition ON, test for less than 1 V between the wheel speed sensor low reference circuit terminal of the appropriate sensor listed below and ground. Left front sensor circuit terminal 16 Right front sensor circuit terminal 27 If greater than the specified range, test the low reference circuit for a short to voltage.
  3. Test for less than 1 V between the signal circuit terminal of the appropriate sensor listed below and ground. Left front sensor circuit terminal 15 Right front sensor circuit terminal 26 If greater than the specified range, test the signal circuit for a short to voltage.
  4. Ignition OFF, test for infinite resistance between the signal circuit terminal of the appropriate sensor listed below and ground. Left front sensor circuit terminal 15 Right front sensor circuit terminal 26 If less than the specified value, test the signal circuit for a short to ground.
  5. Test for infinite resistance between the following low reference circuit terminal of the appropriate sensor listed below and ground. Left front sensor circuit terminal 16 Right front sensor circuit terminal 27 If less than the specified value, test the signal circuit for a short to ground.
  6. Ignition OFF, disconnect the harness connector at the appropriate wheel speed sensor.
  7. Ignition OFF, test for less than 2 ohms between the appropriate signal circuit terminals listed below. Left front sensor signal circuit terminal 15 at the EBCM harness connector, and terminal B at the wheel speed sensor harness connector Right front sensor signal circuit terminal 26 at the EBCM harness connector, and terminal B at the wheel speed sensor harness connector If greater than the specified range, test the signal circuit for an open or high resistance.
  8. Test for less than 2 ohms between the appropriate low reference circuit terminals listed below. Left front sensor low reference circuit terminal 16 at the EBCM harness connector, and terminal A at the wheel speed sensor harness connector Right front sensor low reference circuit terminal 27 at the EBCM harness connector, and terminal A at the wheel speed sensor harness connector If greater than the specified range, test the low reference circuit for an open or high resistance.
  9. If all circuits test normal, replace the wheel speed sensor. If the DTC resets, replace the EBCM.
  1. Disconnect the wheel speed sensor connector.
  2. Ignition OFF, measure for 700-10, 000 ohms across the wheel speed sensor. If the resistance is not within the specified range, replace the faulty wheel speed sensor.
  3. Spin the wheel, with a scan tool measure the AC voltage across the wheel speed sensor for 100 mv AC or greater. If the AC voltage is less than the specified value, replace the faulty wheel speed sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Wheel Speed Sensor Replacement (AWD)»(/chevrolet/express-g2500/2013-2013/remont/anti-locktraction-control/#antilock-brake-system)
  2. «Control Module References»(/chevrolet/express-g2500/2013-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for EBCM replacement, programming and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Rear Wheel Speed Sensor SignalC0055 05C0055 05C0055 0F, C0055 26

The vehicle speed sensor, also called the output shaft speed sensor creates an AC voltage as the rotor teeth pass through the magnetic field of the sensor. The transmission control module (TCM) converts the AC voltage into a vehicle speed signal, which is used to determine shift timing and torque converter clutch scheduling. The TCM also provides a replicated transmission output speed signal to the engine control module (ECM).

The ECM converts the data from the output speed signal to a 128K pulses/mile engine speed signal. The electronic brake control module (EBCM) uses the signal from the ECM in order to calculate the rear wheel speed.

  1. Ignition ON.
  2. Ignition voltage is greater than 10 volts.
  1. The EBCM detects a short to voltage, short to ground or an open/high resistance on the rear wheel speed sensor signal circuit.
  2. The replicated output speed signal is erratic or has electrical noise on the signal causing the 128K pulses/mile engine speed signal to lose pulses.
  3. A defective transmission vehicle speed sensor or output speed sensor can cause inaccurate speed reading, creating faulty replicated output speed signal.
  1. The EBCM disables the Antilock Brake System (ABS) for the duration of the ignition cycle.
  2. A driver information center message and/or a warning indicator may be displayed.
  1. The condition for setting the DTC is no longer present.
  2. The EBCM clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.
  1. Visually inspect the vehicle speed sensor or output speed sensor for cracks or damage.
  2. Ensure the vehicle speed sensor or output speed sensor is properly torqued.
  3. Inspect the internal tone ring or gear teeth for damage.
  4. Check for missing pulses or electrical noise on the replicated transmission output speed signal.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  4. «Wiring Repairs»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Note. A condition may result in a stored history DTC C0055, check the replicated transmission output speed signal circuit for damaged wires, missing pulses or electrical noise that may be passed to 128K pulses/mile engine speed signal.

  1. Verify that no DTCs are set in the ECM or TCM. If DTC is set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) .
  2. Observe the scan tool Rear Wheel Speed parameter. The rear wheel speed reading should be within 2 mph of the front speed sensors when driving in a straight line at a speed greater than 20 km/h (13 mph). If not within the specified range, refer to Circuit/System Testing below.
  3. Operate the vehicle within the Conditions for Running the DTC, to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Note. A condition may result in a stored history DTC C0055, check the replicated transmission output speed signal circuit for damaged wires, missing pulses or electrical noise that may be passed to 128K pulses/mile engine speed signal.

  1. Ignition OFF, disconnect the harness connector at the EBCM.
  2. Ignition ON, test for greater than 10 V between the signal circuit terminal 20 and ground. If less than specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
  3. Ignition OFF, disconnect the appropriate harness connector listed below at the ECM: X1 (LMF, L20, L96 or LU3) X2 (LGH or LMM)
  4. Ignition ON, verify that a test lamp does not illuminate between the appropriate signal circuit terminal listed below and ground. Terminal 50 X1 (LU3) Terminal 57 X1 (LMF, L20 or L96) Terminal 27 X2 (LGH) Terminal 54 X2 (LMM) If the test lamp illuminates, test the signal circuit for a short to voltage.
  5. If the circuit tests normal, replace the EBCM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for EBCM or ECM replacement, programming and setup

  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
B+C0110 04C0110 61
GroundC0110 04C0110 61

The pump motor is an integral part of the brake pressure modulator valve (BPMV), while the pump motor relay is integral to the electronic brake control module (EBCM). The pump motor relay is not engaged during normal system operation. When antilock brake system (ABS) or traction control system (TCS) operation is required the EBCM activates the pump motor relay and ground circuit is provided to the pump motor.

  1. Ignition ON.
  2. Initialization is complete.
  1. The EBCM detects a short to battery positive, or open ground circuit, and a continuously on or off motor.
  2. The pump motor continues to rotate briefly after activation creating a feedback voltage. The EBCM sets the code if the measured feedback voltage indicates a binding or stalled pump motor.
  1. The EBCM disables the ABS/TCS/VSES for the duration of the ignition cycle.
  2. The ABS indicator illuminates.
  3. The Traction Control and VSES indicators illuminate.
  4. The Traction Control and Stabilitrak displayed on the DIC.
  1. The condition for the DTC is no longer present.
  2. The EBCM clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  4. «Wiring Repairs»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Circuit Verification

Ignition ON, perform the Pump Motor Test with a scan tool and listen/feel the Pump Motor turn ON and OFF.

  1. Ignition OFF, disconnect the harness connector at the EBCM.
  2. Test for less than 5 ohms between the ground circuits listed below and ground. Terminal 11 Terminal 28 If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify that a test lamp illuminates between the B+ circuits listed below and ground. Terminal 1 Terminal 18 If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, replace the BPMV.
  4. If all circuits test normal, replace the BPMV and verify DTC does not reset. If the DTC resets, replace the EBCM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Brake Pressure Modulator Valve Replacement (With JL4)»(/chevrolet/express-g2500/2013-2013/remont/anti-locktraction-control/#antilock-brake-system) , «Brake Pressure Modulator Valve Replacement (Without JL4)»(/chevrolet/express-g2500/2013-2013/remont/anti-locktraction-control/#antilock-brake-system)
  2. «Control Module References»(/chevrolet/express-g2500/2013-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for EBCM replacement, programming and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
B+C0110 04C0110 61
GroundC0110 04C0110 61

The pump motor is an integral part of the brake pressure modulator valve (BPMV), while the pump motor relay is integral to the electronic brake control module (EBCM). The pump motor relay is not engaged during normal system operation. When antilock brake system (ABS) or traction control system (TCS) operation is required the EBCM activates the pump motor relay and ground circuit is provided to the pump motor.

  1. Ignition ON.
  2. Initialization is complete.
  1. The EBCM detects a short to battery positive, or open ground circuit, and a continuously on or off motor.
  2. The pump motor continues to rotate briefly after activation creating a feedback voltage. The EBCM sets the code if the measured feedback voltage indicates a binding or stalled pump motor.
  1. The EBCM disables the ABS/TCS/VSES for the duration of the ignition cycle.
  2. The ABS indicator illuminates.
  3. The Traction Control and VSES indicators illuminate.
  4. The Traction Control and Stabilitrak displayed on the driver information center.
  1. The condition for the DTC is no longer present.
  2. The EBCM clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  4. «Wiring Repairs»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, perform the Pump Motor Test with a scan tool and listen/feel the Pump Motor turn ON and OFF.

  1. Ignition OFF, disconnect the harness connector at the EBCM.
  2. Test for less than 5 ohms between the ground circuits listed below and ground. Terminal 1 Terminal 25 If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify that a test lamp illuminates between the B+ circuits listed below and ground. Terminal 13 Terminal 38 If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, replace the BPMV.
  4. If all circuits test normal, replace the BPMV and verify DTC does not reset. If the DTC resets, replace the EBCM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Brake Pressure Modulator Valve Replacement (With JL4)»(/chevrolet/express-g2500/2013-2013/remont/anti-locktraction-control/#antilock-brake-system) , «Brake Pressure Modulator Valve Replacement (Without JL4)»(/chevrolet/express-g2500/2013-2013/remont/anti-locktraction-control/#antilock-brake-system)
  2. «Control Module References»(/chevrolet/express-g2500/2013-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for EBCM replacement, programming and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The brake pressure sensor detects a change in the hydraulic brake system as pressure increases in the front brake circuits. The electronic brake control module (EBCM) uses inputs from the brake pressure sensor and the brake switch signal to control accurate braking. The brake pressure sensor is internal to the brake pressure modulator valve (BPMV).

  1. Ignition ON.
  2. Ignition voltage is greater than 10 volts.
  1. Internal pressure sensor fault.
  2. Brake signal does not correlate to brake pressure sensor.
  3. Signal is erratic and changes faster than physically allowed.
  1. The EBCM disables the ABS for the duration of the ignition cycle.
  2. A DIC message and/or a warning indicator may be displayed.
  1. The condition for the DTC is no longer present.
  2. The EBCM clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  4. «Wiring Repairs»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Apply and release brake pedal. Verify the brake stop lamps operate properly. If the brake stop lamps do not operate properly, refer to «Symptoms - Lighting»(/chevrolet/express-g2500/2013-2013/remont/exterior-lights/#lighting-system__symptoms-lighting) .
  2. Replace the EBCM/BPMV assembly.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for EBCM/BPMV replacement, programming and setup

  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The electronic brake control module (EBCM) uses input from the brake pressure sensor for more accurate control during a vehicle stability enhancement system (VSES) event.

  1. Ignition ON.
  2. Ignition voltage is greater than 10 volts.
  1. Internal pressure sensor fault.
  2. Brake Signal does not correlate to Pressure Signal.
  3. Signal is erratic and changes faster than physically allowed.
  1. The EBCM disables the ABS/Traction Control System (TCS)/Vehicle Stability Enhancement System (VSES) for the duration of the ignition cycle.
  2. A DIC message and/or a warning indicator may be displayed.
  1. The condition for the DTC is no longer present.
  2. The EBCM clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  4. «Wiring Repairs»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Apply and release brake pedal. Verify brake lamps operate properly. If brake lamps do not operate properly, refer to «Symptoms - Lighting»(/chevrolet/express-g2500/2013-2013/remont/exterior-lights/#lighting-system__symptoms-lighting) .
  2. If all circuits test normal, replace the EBCM/brake pressure modulator valve (BPMV) assembly.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Control Module References»(/chevrolet/express-g2500/2013-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for EBCM/BPMV replacement, setup, and programming.
  2. «Brake Pressure Modulator Valve Replacement (With JL4)»(/chevrolet/express-g2500/2013-2013/remont/anti-locktraction-control/#antilock-brake-system) , «Brake Pressure Modulator Valve Replacement (Without JL4)»(/chevrolet/express-g2500/2013-2013/remont/anti-locktraction-control/#antilock-brake-system)
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The electronic brake control module (EBCM) detects inputs from the brake pressure sensor, vehicle speed, and a serial data message from the body control module (BCM) that the brake pedal is applied. When the vehicle is stopping the EBCM monitors for the brake pedal is pressed, with the brake pressure increasing and the vehicle is slowing down, or when the vehicle is accelerating, the brake pedal is not pressed and brake pressure is not increasing.

  1. Ignition ON.
  2. The vehicle speed is greater than 16 km/h (10 mph).
  1. The EBCM detects the vehicle speed greater than 21 km/h (13 mph), the brake pedal is Applied for 1 minute, and brake pressure is not increasing.
  2. The EBCM detects brake pedal is Released and the vehicle speed is decreasing while the brake pressure is increasing.
  1. The EBCM disables the traction control system (TCS) and vehicle stability enhancement system (VSES) for the duration of the ignition cycle.
  2. The Traction Control indicator turns ON.
  3. The driver information center (DIC) displays Service Stability System message.
  4. The antilock brake system (ABS) remains functional.
  1. The condition for the DTC is no longer present.
  2. The EBCM clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

The DTC C0161 00 can be set if the brake pedal is applied while accelerating.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  4. «Wiring Repairs»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON, observe the scan tool EBCM BPP parameter while applying and releasing the brake pedal. The reading should change between Applied and Released. If the parameter does not change between applied and release, replace the EBCM.
  2. Replace the BPMV.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Brake Pressure Modulator Valve Replacement (With JL4)»(/chevrolet/express-g2500/2013-2013/remont/anti-locktraction-control/#antilock-brake-system) , «Brake Pressure Modulator Valve Replacement (Without JL4)»(/chevrolet/express-g2500/2013-2013/remont/anti-locktraction-control/#antilock-brake-system)
  2. «Control Module References»(/chevrolet/express-g2500/2013-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for EBCM replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The electronic brake control module (EBCM) receives a serial data message from body control module (BCM) that the brake pedal is applied and to ensure that the states of their feedback circuits agree.

  1. The ignition is ON.
  2. The vehicle speed is greater than 16 km/h (10 mph).
  3. The ignition voltage is greater than 9.5 volts.
  1. The brake pedal is sensed as applied for 6 minutes.
  2. The vehicle speed is greater than 21 km/h (13 mph).

The ABS remains functional.

  1. The condition for the DTC is no longer present.
  2. The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

The DTC C0161 00 can be set if the brake switch is applied while accelerating.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  4. «Wiring Repairs»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Apply and release brake pedal. Verify brake lamps operate properly. If brake lamps do not operate properly, review brake pedal switch diagnostics in lighting. Refer to Symptoms - Lighting .

  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The electronic brake control module (EBCM) monitors Traction Control System (TCS) activation in order to calculate an estimate of the EBCM solenoid valve temperatures. In most cases high solenoid valve temperatures are caused by extended TCS activation. If the EBCM calculates that the solenoid valve temperatures are too high, the EBCM will temporarily suspend the TCS function until the solenoid valves cool.

  1. Ignition ON.
  2. Ignition voltage is greater than 8 volts.

The estimated solenoid coil temperature reaches 220°C (428°F).

  1. The EBCM disables the TCS for the duration of the ignition cycle.
  2. The driver information center (DIC) displays the SERVICE TRACTION CONTROL message.
  3. The DIC displays the Vehicle Stability Enhancement System (VSES) inhibited.
  1. After the solenoid valves have cooled the EBCM automatically re-enables TCS function.
  2. The EBCM clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Most occurrences of this DTC are caused by excessive TCS activation or braking.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  4. «Wiring Repairs»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

IMPORTANTAllow brakes to cool down before performing test.
  1. With scan tool clear the DTC.
  2. With scan tool connected test drive the vehicle under normal braking conditions and without causing TC or ABS activation. Verify DTC C0179 resets. If the DTC resets replace the EBCM.
  3. Refer to Diagnostic Aids.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for EBCM replacement, setup, and programming

  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The lateral accelerometer and the yaw rate sensors are combined into one sensor external to the electronic brake control module (EBCM). The vehicle stability enhancement system (VSES) uses the lateral accelerometer input when calculating the desired yaw rate. The usable output signal is a serial data signal CAN high and CAN low serial data circuits.

Ignition ON.

  1. The yaw/lateral accelerometer sensor fails an internal self test.
  2. The correlation error between the yaw/lateral accelerometer sensor and steering angle sensor.
  1. The EBCM disables the VSES for the duration of the ignition cycle.
  2. The driver information center (DIC) displays the TRAC/STABILITRAK OFF message.
  3. The ABS/TCS remains functional.
  1. The condition for the DTC is no longer present.
  2. The EBCM clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

An incorrectly mounted sensor can cause these faults.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  4. «Wiring Repairs»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition On, verify that DTC U1826 or C0292 are not set. If any of the DTCs are set, Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) .
  2. With a scan tool, clear the DTC.
  3. Test drive the vehicle while observing the scan tool Yaw Rate and Lateral Accelerometer Sensor parameter. The parameters should vary as the vehicle changes directions. If the parameters are locked or erratic, replace the yaw/lateral accelerometer sensor.
  4. Replace the EBCM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Vehicle Yaw Sensor with Vehicle Lateral Accelerometer Replacement»(/chevrolet/express-g2500/2013-2013/remont/anti-locktraction-control/#antilock-brake-system)
  2. «Electronic Brake Control Module Replacement»(/chevrolet/express-g2500/2013-2013/remont/anti-locktraction-control/#antilock-brake-system)
  3. «Control Module References»(/chevrolet/express-g2500/2013-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for EBCM replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
B+C0201 04C0201 01
GroundC0201 04

The solenoid relay is located within the electronic brake control module (EBCM) and supplies battery voltage to all of the valve solenoids.

  1. Ignition voltage is greater than 9.5 volts.
  2. The solenoid relay is commanded ON.
  1. The EBCM detects an open in the battery positive voltage circuit to the solenoid valve relay.
  2. The EBCM detects a stuck open solenoid valve relay or an open circuit between the solenoid valve relay and solenoid valves.
  1. The EBCM disables the Antilock Brake System (ABS)/Traction Control System (TCS)/dynamic rear proportion (DRP)/Vehicle Stability Enhancement System (VSES) for the duration of the ignition cycle.
  2. The ABS indicator illuminates.
  3. The Traction Control indicator illuminates.
  4. The red Brake Warning indicator turns ON.
  5. The driver information center (DIC) displays the SERVICE ABS/TRACTION and the PANIC BRAKE ASSIST message.
  1. The condition for setting the DTC is no longer present and the DTC is cleared with a scan tool.
  2. The EBCM clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  4. «Wiring Repairs»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, observe the scan tool EBCM Battery Voltage Signal parameter. The reading should be battery voltage.

  1. If not within the specified range, refer to Circuit/System Testing below.
  1. Ignition OFF, disconnect the harness connector at the EBCM.
  2. Test for less than 5 ohms between the ground circuits listed below and ground. Terminal 1 Terminal 25 If greater than the specified range, test the ground circuits for an open/high resistance.
  3. Ignition ON, verify that a test lamp illuminates between the B+ circuits listed below and ground. Terminal 13 Terminal 38 If the test lamp does not illuminate, test the B+ circuits for a short to ground or an open/high resistance.
  4. If all circuits test normal, replace the EBCM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for EBCM replacement, programming and setup

  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
B+C0201 04C0201 01
GroundC0201 04

The solenoid relay is located within the electronic brake control module (EBCM) and supplies battery voltage to all of the valve solenoids.

  1. Ignition voltage is greater than 9.5 volts.
  2. The solenoid relay is commanded ON.

One or more of the following conditions exists

  1. The EBCM detects an open in the battery positive voltage circuit to the solenoid valve relay.
  2. The EBCM detects a stuck open solenoid valve relay or an open circuit between the solenoid valve relay and solenoid valves.
  1. The EBCM disables the antilock brake system (ABS), traction control system, and the dynamic rear proportion for the duration of the ignition cycle.
  2. The ABS indicator turns ON.
  3. The Traction Control and Stabilitrak message may be displayed on the driver information center.
  1. The condition for setting the DTC is no longer present.
  2. The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  4. «Wiring Repairs»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, observe the scan tool EBCM Battery Voltage Signal parameter. The reading should be battery voltage.

  1. Ignition OFF, disconnect the harness connector at the EBCM.
  2. Test for less than 5 ohms between the ground circuits listed below and ground. Terminal 11 Terminal 28 If greater than the specified range, test the ground circuits for an open/high resistance.
  3. Ignition ON, verify that a test lamp illuminates between the B+ circuits listed below and ground. Terminal 1 Terminal 18 If the test lamp does not illuminate, test the B+ circuits for a short to ground or an open/high resistance.
  4. If all circuits test normal, replace the EBCM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for EBCM replacement, programming and setup

  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The electronic brake control module (EBCM) and the engine control module (ECM) simultaneously control the traction control. The EBCM sends a serial data message to the ECM requesting torque reduction. When certain ECM DTCs are set, the ECM will not be able to perform the torque reduction for traction control. A serial data message is sent to the EBCM indicating that traction control is not allowed.

Engine running.

The ECM detects a fault that prevents it from performing a traction control function and sends a serial data message to the EBCM indicating that torque reduction is not allowed.

The EBCM sends a serial data message to illuminate the appropriate warning/indicator message

  1. The condition for the DTC is no longer present.
  2. The EBCM clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  4. «Wiring Repairs»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Verify that no DTCs are set in the ECM.

  1. If DTCs are set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) .
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Wheel Speed Sensor Frequency ErrorC0245 00, C0245 5A

The wheel speed sensor receives a 12-volt power supply voltage from the electronic brake control module (EBCM) and provides an output signal to the EBCM. As the wheel spins, the wheel speed sensor sends the EBCM a DC square wave signal. The EBCM uses the frequency of the square wave signal to calculate the wheel speed.

  1. Ignition ON.
  2. Wheel speed is greater than 8km/h (4mph)
  3. No wheel speed sensor faults exist.
  4. Brake is not applied.
  5. Vehicle is not cornering.
  6. No wheel spinning is detected.
  1. Wheel speed differences between one wheel and the others is greater than 15 percent.
  2. All of the conditions for running and setting the DTC are present for a cumulative time of 3 minutes during a single ignition cycle.
  1. Antilock Brake System (ABS), Dynamic Rear Proportioning (DRP) are disabled for the remainder of the ignition cycle.
  2. The ABS and Stabilitrak indicator illuminates.
  3. The brake warning indicator illuminates.
  1. The DTC becomes history when the conditions for setting the DTC are no longer present.
  2. The history DTC clears after 100 malfunction-free ignition cycles.
  3. The EBCM receives a clear code command from the scan tool.
  1. Faulty wheel speed sensor will not set this DTC.
  2. A vehicle using a space saver spare will not set this code.
  3. Installing a tire of significantly different size on the vehicle causes this DTC to set.
  4. Operating the vehicle with a tire that has very low air pressure may also set this DTC.
  5. Inspect the vehicle for an incorrect or damaged wheel speed sensor or VSS if the tires and the EBCM and ECM calibrations are OK.
  6. If the front tires are not the same size as the rear tires, the EBCM calibration must match the FRONT tire size and the ECM calibration must match the REAR tire size.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  4. «Wiring Repairs»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for Scan Tool Information

Inspect for one tire that has improper air pressure or improper size.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Yaw Rate Lateral Accelerometer Sensor SignalC0292 02C0292 07
Yaw Rate Lateral Accelerometer Sensor 12-Volt Reference SignalC0292 02C0292 07
Yaw Rate Lateral Accelerometer Sensor Low ReferenceC0292 02C0292 07

The stability control system is activated by the electronic brake control module (EBCM) by calculating the desired yaw rate and comparing it to the actual yaw rate input. The yaw and lateral accelerometer sensor communicates with the EBCM on a dedicated CAN bus. The desired yaw rate is calculated from the measured steering wheel position, vehicle speed, and lateral acceleration. The difference between the desired yaw rate and actual yaw rate is the yaw rate error, which is a measurement of over-steer or under-steer. If the yaw rate error becomes too large, the EBCM will attempt to correct the vehicle's yaw motion by applying differential braking to the wheels.

The electronic brake control module supplies a 5 V reference and provides a low reference to the steering wheel angle sensor along with ignition voltage to the yaw and lateral accelerometer sensor. The yaw and lateral accelerometer sensor ignition voltage is monitored via an internal feedback circuit to the EBCM microprocessor.

  1. Ignition ON.
  2. Ignition voltage is greater than 10 volts.

C0292 02

The EBCM detects that the 5 V reference circuit is shorted to ground.

C0292 07

  1. The EBCM detects that the yaw and lateral accelerometer sensor ignition circuit is shorted to ground.
  2. The EBCM detects that the steering angle sensor 5 V reference circuit is shorted to ground or shorted to B+.
  3. The EBCM detects that the steering angle sensor low reference circuit is open or has high resistance.
  1. The EBCM turns OFF the 12-volt reference circuit, until the ignition is cycled.
  2. The EBCM disables the traction control system (TCS)/vehicle stability enhancement system (VSES) for the duration of the ignition cycle.
  1. The condition for setting the DTC is no longer present and the DTC is cleared with a scan tool.
  2. The EBCM clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

If the yaw rate sensor and lateral accelerometer sensor is disconnected, DTCs will set and the EBCM will not provide 12-volt reference.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  4. «Wiring Repairs»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

  1. Ignition ON.
  2. Verify that DTC U0137, U0186, U1827 or C0710 are not set. If any of the DTCs are set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) . If none of the DTCs are set
  3. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the steering angle sensor. It may take up to 2 minutes for all vehicle systems to power down.
  4. Test for less than 10 ohms between the low reference circuit terminal 2 and ground. If 10 ohms or greater Ignition OFF, disconnect the harness connector at the electronic brake control module. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the electronic brake control module. If less than 10 ohms
  5. Ignition ON.
  6. Test for 4.8-5.2 V between the 5 V reference circuit terminal 1 and ground. If less than 4.8 V Ignition OFF, disconnect the harness connector at the electronic brake control module. Test for infinite resistance in the 5 V reference circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the 5 V reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the electronic brake control module. If greater than 5.2 V Ignition OFF, disconnect the harness connect at the electronic brake control module, ignition ON. Test for less than 1 V between the 5 V reference circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the electronic brake control module. If between 4.8-5.2 V
  7. Ignition OFF, disconnect the harness connector at the electronic brake control module.
  8. Test for infinite resistance between the signal circuit terminal 6 and ground. If less than Infinite resistance Repair the short to ground on the circuit. If Infinite resistance
  9. Connect the harness connector at the electronic brake control module and disconnect the harness connector at the yaw and lateral accelerometer sensor.
  10. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down.
  11. Test for less than 10 ohms between the low reference circuit terminal 6 and ground. If 10 ohms or greater Ignition OFF, disconnect the harness connector at the electronic brake control module. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the electronic brake control module. If less than 10 ohms
  12. Ignition ON.
  13. Verify that a test lamp illuminates between the ignition circuit terminal 1 and ground. If the test lamp does not illuminate Ignition OFF, disconnect the harness connector at the electronic brake control module. Test for infinite resistance between the ignition circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the ignition circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the electronic brake control module. If the test lamp illuminates
  14. Replace the yaw and lateral accelerometer sensor.
  15. Verify the DTC does not set while operating the vehicle under the Conditions for Running the DTC. If the DTC sets Replace the steering angle sensor. If the DTC does not set
  16. All OK.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for EBCM replacement, setup, and programming.

  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The electronic brake control module (EBCM) must be programmed using SPS.

  1. Ignition ON.
  2. Ignition voltage is greater than 10 volts.

The EBCM has not been programmed.

Actions Taken When DTC Sets

A DIC message and/or a warning indicator may be displayed.

  1. The condition for the DTC is no longer present.
  2. The EBCM clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  2. «Circuit Testing»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  3. «Connector Repairs»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  4. «Wiring Repairs»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information.

Verify that DTC C0558 is not set.

  1. If the DTC is set, program the EBCM. If the DTC resets, replace the EBCM.

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for EBCM replacement, programming and setup

  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The electronic brake control module (EBCM) disables the traction control when other electronic control modules set DTCs for components that affect the operation of the traction control system.

  1. Ignition ON.
  2. Ignition voltage is greater than 10 volts.

The EBCM receives an invalid message from another module over Serial Data which causes the EBCM to deactivate ABS, and TCS, etc.

One or more of the following actions may occur

  1. The EBCM disables the TCS until the DTC becomes a history DTC.
  2. The ABS remains functional.
  3. The Traction Off indicator illuminates.
  1. The condition for the DTC is no longer present and the DTC is cleared with a scan tool.
  2. The EBCM clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

This DTC is for information only. As an aid to the technician, this DTC indicates that there are no problems in the ABS/TCS. The ECM and BCM should be checked for a possible fault.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  4. «Wiring Repairs»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for Scan Tool Information

  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Steering Wheel Speed/Position Sensor 5 V Reference Terminal 1C0710 17C0710 17C0710 17
Steering Wheel Speed/Position Sensor Signal Terminal 6C0710 17C0710 17C0710 17
Steering Wheel Speed/Position Sensor Phase A Signal Terminal 3C0710 17, C0710 55C0710 17, C0710 55C0710 17, C0710 55C0710 5A
Steering Wheel Speed/Position Sensor Phase B Signal Terminal 4C0710 17, C0710 55C0710 17, C0710 55C0710 17, C0710 55C0710 5A
Steering Wheel Speed/Position Sensor Pulse Signal Terminal 5C0710 17, C0710 55C0710 17, C0710 55C0710 17, C0710 55C0710 5A
Steering Wheel Speed/Position Sensor Low Reference Terminal 2C0710 17

The electronic brake control module (EBCM) supplies a 5 V reference and provides a low reference to the steering wheel angle sensor. The EBCM monitors the signal circuit and the three phase circuits to determine the steering wheel position. The EBCM receives three signal inputs from the steering wheel speed/position sensor. The Index Pulse signal is only High when the steering wheel is centered or within a few degrees of the straight ahead position. The 2 input signals Phase A and Phase B are approximately 90 degrees out of phase. The EBCM dynamically interprets the relationship between the Phase A and Phase B inputs, and determines the position of the steering wheel and the direction of the steering wheel rotation.

  1. Ignition ON.
  2. Ignition voltage is greater than 9 V.
  1. Phase A and Phase B signal resistance values do not correlate to one another.
  2. The calculated steering angle from the steering wheel position sensor does not correlate with the steering angle calculated from the yaw rate.
  1. The EBCM disables the vehicle stability enhancement system for the duration of the ignition cycle.
  2. The driver information center (DIC) displays the Service Stability System message.
  3. The antilock brake system (ABS) remains functional.
  4. The traction control and the stability indicators illuminate.
  1. The condition for the DTC is no longer present.
  2. The EBCM clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.
  1. Before any in-depth diagnostics are performed, be aware that DTC C0710 may set if the vehicle has been modified with; suspension lift/lowering kits, the incorrect indexing of the steering shaft to the steering gear or the wrong steering gear installed, or if other than stock size wheels and tires have been installed.
  2. To correct a fretting condition disconnect the suspect connector and add Nyogel lubricant 760G (dielectric grease) to both sides of the connector terminals. Then reconnect the connector and wipe away any excess lubricant. This will correct the additional terminal contact resistance due to the terminal fretting corrosion.
  3. During diagnosis, park the vehicle on a level surface.
  4. The vehicle should not pull in either direction while driving straight on a level surface.
  5. Verify the steering wheel and steering wheel angle sensor is installed correctly.
  6. Verify the steering shaft coupling to the steering gear is properly installed and aligned.
  7. Find out from the customer the conditions under which the DTC was set. This information will help to duplicate the failure.
  8. The snapshot function on the scan tool can help find an intermittent DTC.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  4. «Wiring Repairs»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information.

Note. If the condition is intermittent or cannot be duplicated, disconnect the connectors and add Nyogel lubricant 760G. This procedure will correct the high resistance condition due to terminal fretting corrosion.

  1. Ignition ON.
  2. Verify the scan tool Steering Wheel Position parameter corresponds to the actual steering wheel position as the steering wheel is turned through its entire range of motion. If the parameter does not correspond with the steering wheel position or the reading is erratic Refer to Circuit/System Testing below. If the parameter corresponds with the steering wheel position
  3. Verify the scan tool Digital HWPS Index Pulse parameter cycles between Low and High as the steering wheel is centered and then turned through its entire range of motion. If the parameter does not cycle between Low and High as the steering wheel is turned Refer to Circuit/System Testing below. If the parameter cycles between Low and High as the steering wheel is turned
  4. All OK.
  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the steering wheel speed/position sensor. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 20 ohms between the low reference circuit terminal 2 and ground. If 20 ohms or greater Ignition Off, disconnect the harness connector at the EBCM. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the EBCM. If less than 20 ohms
  3. Ignition ON.
  4. Test for 4.8-5.2 V between the 5 V reference circuit terminal 1 and ground. If less than 4.8 V Ignition OFF, disconnect the harness connector at the EBCM. Test for infinite resistance between the 5 V reference circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test to less than 2 ohms in the 5 V reference circuit end to end. If 2 ohms for greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the EBCM. If greater than 5.2 V Ignition OFF, disconnect the harness connector at the EBCM, ignition ON. Test for less than 1 V between the 5 V reference circuit terminal 1 and ground If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the EBCM. If between 4.8-5.2 V
  5. Test for 4.8-5.2 V between the 5 V reference circuit terminal 1 and the signal circuit terminal 6. If less than 4.8 V Ignition OFF, disconnect the harness connector at the EBCM. Test for less than 2 ohms in the signal circuit end to end. If greater than 2 ohms, repair the open/high resistance in the circuit. If less than 2 ohms, replace the EBCM. If greater than 5.2 V Ignition OFF, disconnect the harness connector at the EBCM, ignition ON. Test for less than 1 V between the signal circuit and ground. If greater than 1 V, repair the short to voltage on the circuit. If less than 1 V, replace the EBCM. If between 4.8-5.2 V
  6. Ignition OFF, disconnect the harness connector at the EBCM.
  7. Test for infinite resistance between the signal circuit terminal 9 and ground. If less than infinite resistance Repair the short to ground on the circuit. If infinite resistance
  8. Connect the harness connector at the EBCM.
  9. Ignition ON.
  10. Test for 6.8-11 V between the signal circuit terminals listed below and ground. Terminal 3 Terminal 4 Terminal 5 If less than 6.8 V Ignition OFF, disconnect the harness connector at the EBCM. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms on the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the EBCM. If greater than 11 V Ignition OFF, disconnect the harness connector at the EBCM, ignition ON. Test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the EBCM. If between 6.8-11 V
  11. Test or replace the steering wheel speed/position sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Steering Wheel Position Sensor or Steering Shaft Lower Bearing Replacement»(/chevrolet/express-g2500/2013-2013/remont/steering-column-switches/#steering-wheel-and-steering-column)
  2. «Control Module References»(/chevrolet/express-g2500/2013-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for EBCM replacement, setup, and programming
IMPORTANTThe following steps must be completed before using the symptom tables. Perform the ABS Diagnostic System Check before using the symptom tables in order to verify that all of the following are true: There are no DTCs set. The control modules can communicate via the serial data link. Review the system description and operation in order to familiarize yourself with the system functions. Refer to ABS Description and Operation .

Visual/Physical Inspection

  1. Inspect for aftermarket devices which could affect the operation of the ABS. Refer to «Checking Aftermarket Accessories»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__checking-aftermarket-accessories) .
  2. Inspect the easily accessible or visible system components, for obvious damage or conditions, which could cause the symptom.

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer Testing for Intermittent Conditions and Poor Connections .

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom

  1. «ABS Indicator Malfunction»(/chevrolet/express-g2500/2013-2013/remont/anti-locktraction-control/#antilock-brake-system)
  2. «Symptoms - Hydraulic Brakes»(/chevrolet/express-g2500/2013-2013/remont/mechanical-hydraulic/#hydraulic-brake-system__symptoms-hydraulic-brakes)
  3. «Traction Control/Stability Control Indicator Malfunction»(/chevrolet/express-g2500/2013-2013/remont/anti-locktraction-control/#antilock-brake-system)
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The instrument panel cluster (IPC) momentarily illuminates the antilock brake system (ABS) indicator during the bulb check when the ignition is cycled ON. When the electronic brake control module (EBCM) detects a fault requiring ABS indicator ON, it sends a serial data message to the IPC to illuminate the ABS indicator.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  4. «Wiring Repairs»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. With a scan tool command the IPC, Lamp Test ON and OFF. The ABS indicator should turn ON and OFF. If the ABS indicator does not turn ON and OFF when commanded, replace the IPC.
  2. Replace the EBCM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for EBCM or IPC replacement, programming and setup

  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
TCS Switch Signal CircuitB27451
1. Traction control cannot be manually disabled.

The driver may disable the Traction Control System by pressing the traction control switch. The body control module (BCM) supplies a 12 volt signal on the traction control signal circuit. When the traction control switch is pressed, this voltage signal is grounded.

Ignition ON.

The BCM detects low voltage on the traction control signal circuit for 60 seconds.

  1. The BCM sends a serial data message to the electronic brake control module (EBCM) informing the EBCM that the desired TCS state cannot be determined.
  2. A driver information center message and/or warning message may be displayed.
  1. The condition for the DTC is no longer present.
  2. The EBCM clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  4. «Wiring Repairs»(/chevrolet/express-g2500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information.

Ignition ON, observe the scan tool BCM Traction Control Switch parameter while pressing and releasing the Traction Control Switch. The reading should change between Active and Inactive.

  1. Ignition OFF, disconnect the harness connector at the traction control switch.
  2. Test for less than 5 ohms between the ground circuit terminal C and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify the scan tool Traction Control Switch State parameter is Active. If not the specified value, test the signal circuit terminal F for a short to ground. If the circuit tests normal, replace the BCM.
  4. Install a 3A fused jumper wire between the signal circuit terminal F and the ground circuit terminal C. Verify the scan tool Traction Control Switch State parameter is Inactive. If not the specified value, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the BCM.
  5. If all circuits test normal, test or replace the traction control switch.
  1. Ignition OFF, disconnect the harness connector at the traction control switch.
  2. Test for infinite resistance between the signal terminal F and the ground terminal C with the switch in the open position. If not the specified value, replace the traction control switch.
  3. Test for less than 3 ohms between the signal terminal F and the ground terminal C with the switch in the closed position. If greater than the specified range, replace the traction control switch.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Electronic Traction Control Switch Replacement»(/chevrolet/express-g2500/2013-2013/remont/anti-locktraction-control/#antilock-brake-system)
  2. «Control Module References»(/chevrolet/express-g2500/2013-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming and setup
WARNINGRefer to Brake Fluid Irritant Warning .

Note. Before performing the ABS Automated Bleed Procedure, first perform a manual or pressure bleed of the base hydraulic brake system. Refer to Hydraulic Brake System Bleeding (Pressure) , Hydraulic Brake System Bleeding (Manual) . The automated bleed procedure must be performed when a new brake pressure modulator valve (BPMV) is installed, because the secondary circuits of the new BPMV are not prefilled with brake fluid. The automated bleed procedure is recommended when one of the following conditions exist: Base brake system bleeding does not achieve the desired pedal height or feel Extreme loss of brake fluid has occurred Air ingestion is suspected in the secondary circuits of the brake modulator assembly

The ABS Automated Bleed Procedure uses a scan tool to cycle the system solenoid valves and run the pump in order to purge any air from the secondary circuits. These circuits are normally closed off, and are only opened during system initialization at vehicle start up and during ABS operation. The automated bleed procedure opens these secondary circuits and allows any air trapped in these circuits to flow out away from the brake modulator assembly, which is then forced out at the brake corners by the pressure bleeder.

Automated Bleed Procedure

  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/express-g2500/2013-2013/remont/hoistjack/#general-information) .
  2. Remove the tire and wheel assemblies. Refer to «Tire and Wheel Removal and Installation (6-Lug Wheel)»(/chevrolet/express-g2500/2013-2013/remont/wheel-tire-system/#tires-and-wheels__tire-and-wheel-removal-and-installation) , «Tire and Wheel Removal and Installation (8-Lug Wheel)»(/chevrolet/express-g2500/2013-2013/remont/wheel-tire-system/#tires-and-wheels__tire-and-wheel-removal-and-installation) .
  3. Inspect the brake system for leaks and visual damage. Refer to «Symptoms - Hydraulic Brakes»(/chevrolet/express-g2500/2013-2013/remont/mechanical-hydraulic/#hydraulic-brake-system__symptoms-hydraulic-brakes) . Repair or replace components as needed.
  4. Lower the vehicle.
  5. Prepare the brake bleeding equipment and the vehicle for a pressure bleed of the base hydraulic brake system. Refer to «Hydraulic Brake System Bleeding (Pressure)»(/chevrolet/express-g2500/2013-2013/remont/mechanical-hydraulic/#hydraulic-brake-system) , «Hydraulic Brake System Bleeding (Manual)»(/chevrolet/express-g2500/2013-2013/remont/mechanical-hydraulic/#hydraulic-brake-system) .
  6. Inspect the battery state of charge. Refer to «Battery Inspection/Test»(/chevrolet/express-g2500/2013-2013/remont/charging-system/#battery-charging-system-and-starting-system) .
  7. Install a scan tool.
  8. Turn the ignition ON, with the engine OFF.
  9. With the scan tool, perform the following steps: Select Diagnostics Select the appropriate vehicle information Select Chassis Select Electronic Brake Control Module (EBCM) Select Special Functions Select Automated Bleed
  10. With an assistant ready, raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/express-g2500/2013-2013/remont/hoistjack/#general-information) .
  11. Perform the automated bleed procedure as instructed by the scan tool.
  12. If the automated bleed procedure is aborted, a malfunction exists. If a DTC is detected, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) to diagnose the DTC.
  13. After completion of the automated bleed procedure, press and hold the brake pedal to inspect for pedal firmness.
  14. If the brake pedal feels spongy, repeat the bleed procedure completely.
  15. Remove the scan tool.
  16. Install the tire and wheel assemblies. Refer to «Tire and Wheel Removal and Installation (6-Lug Wheel)»(/chevrolet/express-g2500/2013-2013/remont/wheel-tire-system/#tires-and-wheels__tire-and-wheel-removal-and-installation) , «Tire and Wheel Removal and Installation (8-Lug Wheel)»(/chevrolet/express-g2500/2013-2013/remont/wheel-tire-system/#tires-and-wheels__tire-and-wheel-removal-and-installation) .
  17. Lower the vehicle.
  18. Adjust the brake fluid level. Refer to «Master Cylinder Reservoir Filling»(/chevrolet/express-g2500/2013-2013/remont/mechanical-hydraulic/#hydraulic-brake-system__master-cylinder-reservoir-filling) .
  19. Road test the vehicle while confirming the brake pedal remains high and firm.

Removal Procedure

  1. Disconnect the negative battery cable. Refer to «Battery Negative Cable Disconnection and Connection»(/chevrolet/express-g2500/2013-2013/remont/charging-system/#battery-charging-system-and-starting-system) .
  2. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/express-g2500/2013-2013/remont/hoistjack/#general-information) .
  3. Remove the brake modulator shield mounting nuts, if equipped.
  4. Remove the brake modulator shield mounting bolt and the brake modulator shield, if equipped.
  5. Remove all dirt and debris from the electronic brake control module (EBCM) and the brake pressure modulator valve (BPMV) before loosening or removing any of the components.
  6. Disconnect the electrical connector from the EBCM.
  7. Remove and discard the EBCM bolts (1).
  8. Carefully remove the EBCM (1) from the BPMV.
  9. Clean the sealing surface of the BPMV using denatured alcohol and a clean shop cloth.

Installation Procedure

  1. Carefully align and install the EBCM (1) to the BPMV. Do not force the components together.
  2. Install new EBCM bolts (1). Tighten the bolts in a cross pattern to 3 N.m (27 lb in).
  3. Connect the electrical connector to the EBCM.
  4. Install the brake modulator shield and the mounting nuts, if equipped, and tighten to 25 N.m (18 lb ft).
  5. Install the brake modulator shield mounting bolt and tighten to 25 N.m (18 lb ft).
  6. Lower the vehicle.
  7. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnection and Connection»(/chevrolet/express-g2500/2013-2013/remont/charging-system/#battery-charging-system-and-starting-system) .
  8. Refer to «Control Module References»(/chevrolet/express-g2500/2013-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for programming and setup information.
WARNINGRefer to Brake Fluid Irritant Warning .
  1. Disconnect the negative battery cable. Refer to «Battery Negative Cable Disconnection and Connection»(/chevrolet/express-g2500/2013-2013/remont/charging-system/#battery-charging-system-and-starting-system) .
  2. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/express-g2500/2013-2013/remont/hoistjack/#general-information) .
  3. Remove the 2 brake modulator shield mounting nuts, if equipped.
  4. Remove the brake modulator shield mounting bolt and the shield.
  5. Remove all dirt and debris from the electronic brake control module (EBCM) and the brake pressure modulator valve (BPMV) before loosening or removing any of the components.
  6. Disconnect the electrical connector from the EBCM.
  7. If equipped with AWD, remove the LF suspension torsion bar. Refer to «Torsion Bar and Support Assembly Replacement»(/chevrolet/express-g2500/2013-2013/remont/suspension-front/#front-suspension-system__torsion-bar-and-support-assembly-replacement) .
  8. Disconnect the rear master cylinder brake pipe fitting (1). Cap the brake pipe fitting and plug the BPMV inlet port to prevent brake fluid loss and contamination.
  9. Disconnect the front master cylinder brake pipe fitting (1). Cap the brake pipe fitting and plug the BPMV inlet port to prevent brake fluid loss and contamination.
  10. Disconnect the LF brake pipe fitting (1). Cap the brake pipe fitting and plug the BPMV outlet port to prevent brake fluid loss and contamination.
  11. Disconnect the RF brake pipe fitting (1). Cap the brake pipe fitting and plug the BPMV outlet port to prevent brake fluid loss and contamination.
  12. Disconnect the LR brake pipe fitting (1). Cap the brake pipe fitting and plug the BPMV outlet port to prevent brake fluid loss and contamination.
  13. Disconnect the RR brake pipe fitting (1). Cap the brake pipe fitting and plug the BPMV outlet port to prevent brake fluid loss and contamination.
  14. Remove the BPMV bracket bolts (1).
  15. Remove the BPMV and bracket assembly from the vehicle.
  16. Remove the BPMV bolt (1).
  17. Remove the BPMV assembly (1) from the bracket.
  18. If installing a new BPMV, remove the EBCM. Refer to «Electronic Brake Control Module Replacement»(/chevrolet/express-g2500/2013-2013/remont/anti-locktraction-control/#antilock-brake-system) .
  1. Install the EBCM, if removed. Refer to «Electronic Brake Control Module Replacement»(/chevrolet/express-g2500/2013-2013/remont/anti-locktraction-control/#antilock-brake-system) .
  2. Install the BPMV assembly (1) to the bracket.
  3. Install the BPMV bolt (1) and tighten to 11 N.m (97 lb in).
  4. Install the BPMV and bracket assembly to the vehicle.
  5. Install the BPMV bracket bolts (1) and tighten to 25 N.m (18 lb ft).
  6. Connect the RR brake pipe fitting (1) and tighten to 25 N.m (18 lb ft).
  7. Connect the LR brake pipe fitting (1) and tighten to 25 N.m (18 lb ft).
  8. Connect the RF brake pipe fitting (1) and tighten to 25 N.m (18 lb ft).
  9. Connect the LF brake pipe fitting (1) and tighten to 25 N.m (18 lb ft).
  10. Connect the front master cylinder brake pipe fitting (1) and tighten to 25 N.m (18 lb ft).
  11. Connect the rear master cylinder brake pipe fitting (1) and tighten to 25 N.m (18 lb ft).
  12. Install the brake modulator shield, if equipped.
  13. Install the brake modulator shield bolt and tighten to 25 N.m (18 lb ft).
  14. Install the 2 brake modulator shield nuts and tighten to 25 N.m (18 lb ft).
  15. If equipped with AWD, install the LF suspension torsion bar. Refer to «Torsion Bar and Support Assembly Replacement»(/chevrolet/express-g2500/2013-2013/remont/suspension-front/#front-suspension-system__torsion-bar-and-support-assembly-replacement) .
  16. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnection and Connection»(/chevrolet/express-g2500/2013-2013/remont/charging-system/#battery-charging-system-and-starting-system) .
  17. Bleed the antilock brake system. Refer to «Antilock Brake System Automated Bleed»(/chevrolet/express-g2500/2013-2013/remont/anti-locktraction-control/#antilock-brake-system) .
WARNINGRefer to Brake Fluid Irritant Warning .
  1. Disconnect the negative battery cable. Refer to «Battery Negative Cable Disconnection and Connection»(/chevrolet/express-g2500/2013-2013/remont/charging-system/#battery-charging-system-and-starting-system) .
  2. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/express-g2500/2013-2013/remont/hoistjack/#general-information) .
  3. Remove the 2 brake modulator shield mounting nuts, if equipped.
  4. Remove the brake modulator shield bolt and the brake modulator shield.
  5. Remove all dirt and debris from the electronic brake control module (EBCM) and the brake pressure modulator valve (BPMV) before loosening or removing any of the components.
  6. Disconnect the electrical connector from the EBCM.
  7. If equipped with AWD, remove the LF suspension torsion bar. Refer to «Torsion Bar and Support Assembly Replacement»(/chevrolet/express-g2500/2013-2013/remont/suspension-front/#front-suspension-system__torsion-bar-and-support-assembly-replacement) .
  8. Disconnect the front master cylinder brake pipe fitting (1). Cap the brake pipe fitting and plug the BPMV inlet port to prevent brake fluid loss and contamination.
  9. Disconnect the rear master cylinder brake pipe fitting (1). Cap the brake pipe fitting and plug the BPMV inlet port to prevent brake fluid loss and contamination.
  10. Disconnect the rear brake pipe fitting (1). Cap the brake pipe fitting and plug the BPMV outlet port to prevent brake fluid loss and contamination.
  11. Disconnect the RF brake pipe fitting (1). Cap the brake pipe fitting and plug the BPMV outlet port to prevent brake fluid loss and contamination.
  12. Disconnect the LF brake pipe fitting (1). Cap the brake pipe fitting and plug the BPMV outlet port to prevent brake fluid loss and contamination.
  13. Remove the BPMV bracket bolts (1).
  14. Remove the BPMV and bracket assembly from the vehicle.
  15. Remove the BPMV bolt (1).
  16. Remove the BPMV assembly (1) from the bracket.
  17. If installing a new BPMV, remove the EBCM. Refer to «Electronic Brake Control Module Replacement»(/chevrolet/express-g2500/2013-2013/remont/anti-locktraction-control/#antilock-brake-system) .
  1. Install the EBCM to the BPMV, if removed. Refer to «Electronic Brake Control Module Replacement»(/chevrolet/express-g2500/2013-2013/remont/anti-locktraction-control/#antilock-brake-system) .
  2. Install the BPMV assembly (1) to the bracket.
  3. Install the BPMV bolt (1) and tighten to 11 N.m (97 lb in).
  4. Install the BPMV and bracket assembly to the vehicle.
  5. Install the BPMV bracket bolts (1) and tighten to 25 N.m (18 lb ft).
  6. Connect the LF brake pipe fitting (1) and tighten to 25 N.m (18 lb ft).
  7. Connect the RF brake pipe fitting (1) and tighten to 25 N.m (18 lb ft).
  8. Connect the rear brake pipe fitting (1) and tighten to 25 N.m (18 lb ft).
  9. Connect the rear master cylinder brake pipe fitting (1) and tighten to 25 N.m (18 lb ft).
  10. Connect the front master cylinder brake pipe fitting (1) and tighten to 25 N.m (18 lb ft).
  11. Install the brake modulator shield, if equipped.
  12. Install the brake modulator shield nuts and tighten to 25 N.m (18 lb ft).
  13. Install the brake modulator shield bolt and tighten to 25 N.m (18 lb ft).
  14. If equipped with AWD, install the LF suspension torsion bar. Refer to «Torsion Bar and Support Assembly Replacement»(/chevrolet/express-g2500/2013-2013/remont/suspension-front/#front-suspension-system__torsion-bar-and-support-assembly-replacement) .
  15. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnection and Connection»(/chevrolet/express-g2500/2013-2013/remont/charging-system/#battery-charging-system-and-starting-system) .
  16. Bleed the antilock brake system. Refer to «Antilock Brake System Automated Bleed»(/chevrolet/express-g2500/2013-2013/remont/anti-locktraction-control/#antilock-brake-system) .
  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/express-g2500/2013-2013/remont/hoistjack/#general-information) .
  2. Remove the tire and wheel. Refer to «Tire and Wheel Removal and Installation (6-Lug Wheel)»(/chevrolet/express-g2500/2013-2013/remont/wheel-tire-system/#tires-and-wheels__tire-and-wheel-removal-and-installation) , «Tire and Wheel Removal and Installation (8-Lug Wheel)»(/chevrolet/express-g2500/2013-2013/remont/wheel-tire-system/#tires-and-wheels__tire-and-wheel-removal-and-installation) .
  3. Remove the brake rotor (2) shown on the 1500 Series. Refer to «Front Brake Rotor Replacement (JH6, JH9)»(/chevrolet/express-g2500/2013-2013/remont/mechanical-hydraulic/#disc-brake-system) , «Front Brake Rotor Replacement (JH5)»(/chevrolet/express-g2500/2013-2013/remont/mechanical-hydraulic/#disc-brake-system) .
  4. Remove the wheel speed sensor (WSS) cable mounting clip from the knuckle.
  5. Remove the WSS cable mounting clip from the upper control arm.
  6. Remove the WSS cable mounting clip from the frame attachment point.
  7. Remove the WSS cable electrical connector.
  8. Remove the WSS mounting bolt.
  9. Remove the wheel speed sensor (5) from the hub/bearing assembly (4) shown on the 2500/3500 Series.
  1. Plug the WSS bore to prevent debris from falling into the hub.
  2. Using a wire brush or equivalent, clean the WSS mounting surface on the hub to remove any rust or corrosion.
  3. Apply a thin layer of wheel bearing lubricant, GM P/N 01051344 to the hub surface and the sensor O-ring prior to sensor installation.
  4. Install the WSS (5) into the hub/bearing assembly (4) shown on the 2500/3500 Series. Ensure that the sensor is seated flat against the hub.
  5. Install the WSS mounting bolt and tighten to 18 N.m (13 lb ft).
  6. Install the WSS cable mounting clip to the knuckle.
  7. Install the WSS cable mounting clip to the upper control arm.
  8. Install the WSS cable mounting clip to the frame attachment point.
  9. Connect the WSS cable electrical connector.
  10. Install the brake rotor (2) shown on the 1500 Series. Refer to «Front Brake Rotor Replacement (JH6, JH9)»(/chevrolet/express-g2500/2013-2013/remont/mechanical-hydraulic/#disc-brake-system) , «Front Brake Rotor Replacement (JH5)»(/chevrolet/express-g2500/2013-2013/remont/mechanical-hydraulic/#disc-brake-system) .
  11. Install the tire and wheel. Refer to «Tire and Wheel Removal and Installation (6-Lug Wheel)»(/chevrolet/express-g2500/2013-2013/remont/wheel-tire-system/#tires-and-wheels__tire-and-wheel-removal-and-installation) , «Tire and Wheel Removal and Installation (8-Lug Wheel)»(/chevrolet/express-g2500/2013-2013/remont/wheel-tire-system/#tires-and-wheels__tire-and-wheel-removal-and-installation) .
  12. Perform the vehicle diagnostic system check. Refer to «Diagnostic System Check - Vehicle»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) .
  1. Raise the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/express-g2500/2013-2013/remont/hoistjack/#general-information) .
  2. For the left rear sensor, remove the leaf spring anchor plate. Refer to «Leaf Spring Replacement (1500/3500)»(/chevrolet/express-g2500/2013-2013/remont/suspension-rear/#rear-suspension-system) , «Leaf Spring Replacement (4500 Series)»(/chevrolet/express-g2500/2013-2013/remont/suspension-rear/#rear-suspension-system) .
  3. Disconnect the electrical connector.
  4. Remove the wheel speed sensor retaining bolt.
  5. Remove the wheel speed sensor and spacer block.
  1. Install the spacer block and the wheel speed sensor.
  2. Install the wheel speed sensor retaining bolt and tighten to 14 N.m (124 lb in).
  3. Connect the electrical connector.
  4. For the left rear sensor, install the leaf spring anchor plate. Refer to «Leaf Spring Replacement (1500/3500)»(/chevrolet/express-g2500/2013-2013/remont/suspension-rear/#rear-suspension-system) , «Leaf Spring Replacement (4500 Series)»(/chevrolet/express-g2500/2013-2013/remont/suspension-rear/#rear-suspension-system) .
  5. Lower the vehicle.
  6. Perform a low speed test to ensure the wheel speed sensor is functioning properly: Start the engine and allow it to idle. Check to see if the ABS indicator or the traction assist indicator remains illuminated. If the ABS indicator or the traction assist indicator remains illuminated, DO NOT proceed to drive the vehicle until it is diagnosed and repaired. Check the wheel speed sensor electrical connector to ensure it is not damaged and is installed properly. If the lamp remains illuminated, refer to «Diagnostic Starting Point - Vehicle»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-starting-point-vehicle) . Select a smooth, dry, clean, and level road or large lot that is as free of traffic and obstacles as possible. Drive the vehicle and maintain a speed of at least 16 km/h (10 mph) for at least 5 seconds. Stop the vehicle and check to see if the ABS indicator or the traction assist indicator is illuminated. If an indicator is illuminated, refer to «Diagnostic System Check - Vehicle»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) .

Scheme 5

Scheme 5: Electronic Traction Control Switch Replacement
Scheme 5: Electronic Traction Control Switch Replacement
CalloutComponent Name
1Instrument Panel Cluster Trim Plate Bezel Assembly Refer to Instrument Panel Cluster Trim Plate Bezel Replacement .
2Traction Control Switch Assembly Procedure Squeeze the retaining tabs on the back of the switch and push the switch out of the cluster trim bezel assembly.

Electronic Traction Control Switch Replacement

  1. Remove the passenger seat from the vehicle. Refer to «Driver or Passenger Seat Removal and Installation»(/chevrolet/express-g2500/2013-2013/remont/seats/#seat-hardware-seat-trim-and-upholstery) .
  2. Pull the carpet back to gain access to the sensor.
  3. Remove the nuts (2) from the yaw rate sensor and lateral accelerometer.
  4. Disconnect the electrical connector (3) from the yaw rate sensor/lateral accelerometer.
  5. Remove the yaw rate sensor and lateral accelerometer (1) from the vehicle.
  1. Install the yaw rate sensor and lateral accelerometer (1) to the vehicle.
  2. Install the yaw rate sensor and lateral accelerometer nuts (2) and tighten to 9 N.m (80 lb in).
  3. Install a scan tool.
  4. Using the special functions menu on the scan tool, reset the yaw rate sensor.
  5. Perform the Diagnostic System Check. Refer to «Diagnostic System Check - Vehicle»(/chevrolet/express-g2500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) .
  6. Connect the electrical connector (3) to the yaw rate sensor and lateral accelerometer.
  7. Install the carpet.
  8. Install the passenger seat to the vehicle. Refer to «Driver or Passenger Seat Removal and Installation»(/chevrolet/express-g2500/2013-2013/remont/seats/#seat-hardware-seat-trim-and-upholstery) .

ABS Description and Operation

Vehicles with RPO JL4 are equipped with an EBC 445V ABS/DRP/TCS/VSES module.

This module provides the following vehicle performance enhancement systems.

  1. ABS
  2. Dynamic Rear Proportioning (DRP)
  3. Traction Control System (TCS)
  4. Vehicle Stability Enhancement System (VSES)

The following components are involved in the operation of the above systems.

  1. Electronic brake control module (EBCM)-The EBCM controls the system functions and detects failures. The EBCM contains the following components. System relay-The system relay is internal to the EBCM. The system relay is energized when the ignition is ON. The system relay supplies battery positive voltage to the valve solenoids and to the ABS pump motor. This voltage is referred to as system voltage. Solenoids-The solenoids are commanded ON and OFF by the EBCM to operate the appropriate valves in the brake pressure modulator valve (BPMV). Longitudinal accelerometer-The EBCM uses the longitudinal accelerometer to determine the actual straight-line acceleration of the vehicle.
  2. BPMV-The BPMV uses a 4-circuit configuration to control hydraulic pressure to each wheel independently. The BPMV contains the following components. ABS pump motor and pump Four isolation valves Four dump valves Two traction control isolation valves Two traction control supply valves A master cylinder pressure sensor A front low-pressure accumulator A rear low-pressure accumulator
  3. Active wheel speed sensors-The EBCM sends a 12-volt reference signal to each wheel speed sensor. As the wheel spins, the wheel speed sensor produces a digital square wave DC signal voltage. The wheel speed sensor increases the signal frequency as the wheel speed increases, but does not increase the signal amplitude.
  4. Passive wheel speed sensors-As the wheels spin, toothed rings interrupt magnetic fields in the wheel speed sensors. This causes each wheel speed sensor to generate an analog AC signal. The EBCM uses these AC signals to calculate the wheel speed. Any imperfections in the toothed ring, such as a missing or damaged tooth, can cause an inaccurate wheel speed sensor signal.
  5. The vehicle speed sensor (VSS) also called the output speed sensor (OSS) may be found in the transmission or transfer case and creates a AC voltage signal that increases in frequency as vehicle speed increases. The transmission control module (TCM) receives and process this signal. The TCM provides a digital VSS signal on the data communication line to the engine control module (ECM) and other controllers connected to the data line. The ECM converts the data from the vehicle speed sensor to a 128K pulses/mile signal. The electronic brake control module (EBCM) uses the vehicle speed signal from the ECM in order to calculate the rear wheel speed.
  6. Traction control switch-VSES and the engine torque reduction function of traction control system are manually disabled by pressing and holding the traction control switch for at least 5 seconds. These functions can be re-enabled with a quick press and release of the traction control switch.
  7. Lateral accelerometer-The EBCM uses the lateral accelerometer to determine the sideways acceleration of the vehicle. The lateral accelerometer is packaged with the yaw rate sensor as a single component.
  8. Master cylinder pressure sensor-The master cylinder pressure sensor is located within the BPMV. The master cylinder pressure sensor uses a 5-volt reference and generates an output signal proportionate to the hydraulic fluid pressure which is present in the front brake circuit at the master cylinder.
  9. Yaw rate sensor-The EBCM uses the yaw rate sensor to determine the rate of rotation along the vehicle's vertical axis. The yaw rate sensor is packaged with the lateral accelerometer as a single component.
  10. Steering wheel position sensor-The EBCM receives several inputs from the steering wheel position sensor. Three digital square wave signal inputs are wired directly to the EBCM harness connector, however, only signals A and B are used or monitored. The failure of the index pulse signal does not effect VSES function. The EBCM also monitors an analog steering wheel position sensor signal. Battery voltage is supplied to the digital portion of the steering wheel position sensor by the ignition 1 circuit. The analog portion of the steering wheel position sensor is supplied a 5-volt reference from the EBCM.

When wheel slip is detected during a brake application, an ABS event occurs. During antilock braking, hydraulic pressure in the individual wheel circuits is controlled to prevent any wheel from slipping. A separate hydraulic line and specific solenoid valves are provided for each wheel. The ABS can decrease, hold, or increase hydraulic pressure to each wheel. The ABS does not, however, increase hydraulic pressure above the amount which is transmitted by the master cylinder during braking.

During antilock braking, a series of rapid pulsations is felt in the brake pedal. These pulsations are caused by the rapid changes in position of the individual solenoid valves as the electronic brake control module (EBCM) responds to wheel speed sensor inputs and attempts to prevent wheel slip. These pedal pulsations are present only during antilock braking and stop when normal braking is resumed or when the vehicle comes to a stop. A ticking or popping noise may also be heard as the solenoid valves cycle rapidly. During antilock braking on dry pavement, intermittent chirping noises may be heard as the tires approach slipping. These noises and pedal pulsations are considered normal during antilock operation.

Vehicles equipped with ABS may be stopped by applying normal force to the brake pedal. Brake pedal operation during normal braking is no different than that of previous non-ABS systems. Maintaining a constant force on the brake pedal provides the shortest stopping distance while maintaining vehicle stability. The typical ABS activation sequence is as follows.

Pressure Hold

The EBCM closes the isolation valve and keeps the dump valve closed in order to isolate the slipping wheel when wheel slip occurs. This holds the pressure steady on the brake so that the hydraulic pressure does not increase or decrease.

Pressure Decrease

If a pressure hold does not correct the wheel slip condition, a pressure decrease occurs. The EBCM decreases the pressure to individual wheels during deceleration when wheel slip occurs. The isolation valve is closed and the dump valve is opened. The excess fluid is stored in the accumulator until the pump can return the fluid to the master cylinder or fluid reservoir.

Pressure Increase

After the wheel slip is corrected, a pressure increase occurs. The EBCM increases the pressure to individual wheels during deceleration in order to reduce the speed of the wheel. The isolation valve is opened and the dump valve is closed. The increased pressure is delivered from the master cylinder.

Dynamic Rear Proportioning (DRP)

The dynamic rear proportioning (DRP) is a control system that enhances the hydraulic proportioning function of the mechanical proportioning valve in the base brake system. The DRP control system is part of the operation software in the electronic brake control module (EBCM). The DRP uses active control with existing ABS in order to regulate the vehicle's rear brake pressure.

Traction Control System (TCS)

Traction is maintained by limiting the amount of torque produced by the drivetrain and also by applying brake pressure to slipping wheels during acceleration. This causes power to transfer through the driveline to wheels which are not slipping. The transfer case used on four wheel drive vehicles equipped with vehicle stability enhancement system (VSES) does not contain a viscous coupling and therefore allows the front and rear drive shafts to turn at substantially different speeds. This front to rear differential must be kept within acceptable parameters by the VSES. The two methods of traction control are performed as follows.

Engine Torque Reduction

The electronic brake control module (EBCM) uses a 5-volt pulse width modulated (PWM) signal to request that the powertrain control module (PCM) reduce the amount of torque to the drive wheels. The PCM reduces torque to the drive wheels by retarding spark timing and commanding the throttle actuator control. The PCM uses a 12-volt PWM signal to report to the EBCM the amount of torque that is being delivered to the drive wheels. Engine torque reduction is mostly used to reduce vehicle speed during VSES events and during traction control system events when the brakes are in danger of being overheated or when the driven wheels are slipping at the same rate. Engine torque reduction can be disabled by pressing the traction control switch.

Brake Pressure Application

The EBCM uses brake pressure application to control traction by transferring torque through the driveline to wheels which are not slipping. The ABS pump motor and appropriate valve solenoids are commanded ON and OFF to apply brake pressure to the slipping wheels. Brake pressure application is used in an attempt to maintain equal wheel speed sensor signals at the driven wheels.

The EBCM does not allow excessive brake pressure application due to the fact that the solenoid coils or the brakes may become overheated, damaging the EBCM or reducing the driver's ability to stop the vehicle. Estimated coil and brake temperatures are determined by a calculation in the EBCM software. Overheated solenoid coils cause all brake pressure application to become disabled and the stability system disabled message to be displayed. Overheated brakes cause brake pressure application during traction control events to disable, yet the VSES remains functional and as long as the engine torque reduction is enabled, there is no indication to the driver when this occurs and no DTC sets.

Vehicle Stability Enhancement System (VSES)

The vehicle stability enhancement system (VSES) provides added stability during aggressive maneuvers. Yaw rate is the rate of rotation about the vehicle's vertical axis. The VSES is activated when the electronic brake control module determines that the desired yaw rate does not match the actual yaw rate as measured by the yaw rate sensor.

The desired yaw rate is calculated by the EBCM using, primarily, the following inputs.

  1. The position of the steering wheel
  2. The speed of the vehicle
  3. The lateral, or sideways acceleration of the vehicle

The difference between the desired yaw rate and the actual yaw rate is the yaw rate error, which is a measurement of oversteer or understeer. When a yaw rate error is detected, the EBCM attempts to correct the vehicle's yaw motion by applying brake pressure to one or more of the wheels. The amount of brake pressure which is applied varies, depending on the correction required. The engine torque may be reduced also, if it is necessary to slow the vehicle while maintaining stability.

VSES activations generally occur in turns during aggressive driving. When braking during VSES activation, the pedal may pulsate. The brake pedal pulsates at a higher frequency during VSES activation than during ABS activation.

System Pre-Fill

This vehicle is equipped with a four wheel disc brake system. Disc brake calipers are designed so that when hydraulic pressure is not being applied, the caliper piston lip seal causes the piston to retract, creating measurable clearance between the brake pads and the rotor. Since a small amount of brake fluid must be delivered to the calipers before any actual braking occurs, the vehicle stability enhancement system (VSES) uses system pre-fill to prevent delayed brake application and enhance system performance. If the electronic brake control module (EBCM) determines that a brake application is likely to be needed, the ABS pump motor runs momentarily to take up any clearances between the brake pads and the rotor. By monitoring the master cylinder pressure sensor feedback signal, the EBCM can determine when the brake pads are contacting the rotor. The EBCM then holds this small amount of pressure in the system. A VSES brake application may or may not occur after pre-fill is complete. If the EBCM determines that a brake application is no longer pending, the pre-fill pressure is released and the VSES system returns to the normal, monitoring state. The reason that we must understand system pre-fill is that pre-fill may lead to customer concerns. Any time the ABS pump motor is active, the motor draws a large amount of current, and may cause the vehicle lighting systems to dim noticeably. When ABS activity occurs, most drivers understand that this activity is the cause of noises and dimming lights. Likewise, when an actual VSES event occurs, the Stability System Active message is displayed, which helps drivers understand why these other conditions occur. Since pre-fill is not an actual VSES event, but preparation for a pending event, no message is displayed. Also, system noise during pre-fill is very minimal. A customer may become concerned with what is perceived to be an electrical problem, due to the intermittent dimming lights, when, in fact, no malfunction exists and the condition is normal.

Power-up Self-Test

The electronic brake control module (EBCM) is able to detect many malfunctions whenever the ignition is ON. However, certain failures cannot be detected unless active diagnostic tests are performed on the components. Shorted solenoid coil or motor windings, for example, cannot be detected until the components are commanded ON by the EBCM. Therefore, a power-up self-test is required at the beginning of each ignition cycle to verify correct operation of components before the various control systems can be enabled. The EBCM performs the first phase of the power-up self-test when the ignition is first turned ON. The system relay, solenoids and the ABS pump motor are commanded ON and OFF to verify proper operation and the EBCM verifies the ability to return the system to base braking in the event of a failure. The master cylinder pressure sensor performs a self-test by sending a series of specific voltage signals to the EBCM, each for a predetermined amount of time. This phase of the power-up self-test may be heard by the driver, depending on how soon the engine is cranked and started after turning ON the ignition. The second phase of the power-up self-test begins when the vehicle is driven at a speed greater than 16 km/h (10 mph) and the EBCM has not detected any traction control system (TCS)/vehicle stability enhancement system (VSES) related malfunctions thus far. During this phase, the ABS pump is tested to verify the ability to build adequate pressure to perform brake pressure application during certain TCS and VSES events. When the brake switch indicates that the brake is not applied and the master cylinder pressure is detected as being low, the EBCM proceeds with the test. The EBCM isolates all of the wheels by closing the 4 isolation valves. The ABS pump is then commanded ON while the EBCM monitors the master cylinder pressure sensor input. The ABS pump must build approximately 248 kPa (36 psi) of hydraulic pressure within 1 second or the test is failed. If the EBCM uses brake pressure application to perform TCS or VSES prior to the second phase of the power-up self-test, the ABS pump is tested at this time and the second phase of the test is not required. Due to the fact that all of the wheels are isolated during the second phase of the test, the test must be aborted if the brake is applied while the test is being performed. Occasionally, the driver may detect this by experiencing a momentary hard pedal.

VSES Sensors Initialization

The vehicle stability enhancement system (VSES) sensors values may vary slightly due to differences in temperature, sensor mounting, connector resistances, manufacturing, etc. Since the VSES is a very sensitive and precise control system, it is imperative that the electronic brake control module (EBCM) be able to accurately equate a given sensor voltage with an actual unit of measurement. For example, the yaw rate signal of one vehicle may be 2.64 volts at +18.0 deg/sec yaw rate while the yaw rate signal of another vehicle may be 2.64 volts at +17.5 deg/sec yaw rate. Therefore, at the beginning of each ignition cycle, the EBCM must perform an initialization procedure to observe how the VSES sensors are correlated with each other and also to determine what each sensor value is when the applicable unit of measurement equals 0. This voltage is referred to as the sensor bias voltage. Although some activation of the VSES system may occur if required to prior to full initialization, the system does not give optimum performance until the sensors are fully initialized.

The following VSES sensors require initialization.

  1. The yaw rate sensor
  2. The lateral accelerometer
  3. The longitudinal accelerometer
  4. The master cylinder pressure sensor
  5. The steering wheel position sensor

When the vehicle speed is greater than 25 km/h (15 mph), full sensor initialization must occur during 3 km (1.8 mi) of driving or 1 km (0.6 mi) of straight and stable driving, whichever occurs first. Although an attempt at initialization may fail due to driving conditions, such as driving on a very winding road, failed initialization is usually caused by a sensor bias voltage which is not within an acceptable range. Often, a DTC sets soon after a failed initialization attempt. The stability system not ready indicator illuminates when sensor initialization fails.

ECE 13 Response

The electronic brake control module (EBCM) illuminates the ABS indicator when a malfunction which disables ABS is detected. Usually, the ABS indicator is turned OFF during the following ignition cycle unless the fault is detected during that ignition cycle. However, the setting of a wheel speed sensor related DTC causes the ABS indicator to remain illuminated during the following ignition cycle until the vehicle is operated at a speed greater than 13 km/h (8 mph). This allows the EBCM to verify that no malfunction exists, before turning OFF the ABS indicator. This reaction occurs even if the ABS indicator turns OFF when the scan tool is used to clear the DTCs. When repairing these vehicles, it is important to ensure that the ECE 13 response has occurred and that the ABS indicator does not illuminate after returning the vehicle to the customer. It is also important to verify that ECE 13 is not the cause of an ABS indicator which is illuminated when no DTCs are set, before attempting to diagnose other possible causes.

Driver Information Indicators and Messages

The following indicators are used to inform the driver of several different factors.

Brake Warning Indicator

The instrument panel cluster (IPC) illuminates the brake warning indicator when the following occurs.

  1. The IPC performs the bulb check.
  2. The EBCM detects an ABS-disabling malfunction which also disables dynamic rear proportioning and sends a serial data message to the IPC requesting illumination.
  3. The electronic brake control module (EBCM) detects a low brake fluid condition or a base brake pressure differential and sends a serial data message to the IPC requesting illumination.
  4. The body control module (BCM) detects that the park brake is engaged. The IPC receives a serial data message from the BCM requesting illumination. The brake warning indicator flashes at a rate of approximately twice per second when the park brake is engaged.

ABS Indicator

The IPC illuminates the ABS indicator when the following occurs.

  1. The IPC performs the bulb check.
  2. The IPC detects a loss of serial data communication with the EBCM.
  3. The EBCM detects an ABS-disabling malfunction and sends a serial data message to the IPC requesting illumination.
  4. A DTC is set during the previous ignition cycle which requires an ECE 13 response at the beginning of the current ignition cycle. The EBCM sends a serial data message to the IPC requesting illumination.

Traction Off Indicator

The IPC illuminates the traction off indicator when the following occurs.

  1. The IPC performs the bulb check.
  2. The EBCM disables engine torque reduction due to a malfunction and sends a serial data message to the IPC requesting illumination.
  3. The IPC flashes the traction off indicator if wheel slip is detected while engine torque reduction and brake pressure application are both disabled.
  4. The driver manually disables VSES and engine torque reduction by pressing the traction control switch. The EBCM sends a serial data message to the IPC requesting illumination.

Service Brake System Message

The service brake system message is displayed whenever the red brake warning indicator is illuminated.

Service Stability System Message

The message center displays the service stability system message when any one of many VSES-disabling DTCs is set. The EBCM sends a serial data message to the IPC requesting this display.

Stability SYS Active Message

The message center displays the stability system active message when a traction control or VSES event occurs. The EBCM sends a serial data message to the IPC request this display.

Stability SYS Ready Message

The message center displays the stability system ready message when the system has initialize.

Stability SYS Disabled Message

The message center displays the stability system disabled message when one or more of the following conditions exists.

  1. The transfer case is shifted into 4 LO. The EBCM sends a serial data message to the IPC requesting illumination
  2. VSES sensor initialization time is excessive. The EBCM sends a serial data message to the IPC requesting this display.
  3. The EBCM detects an excessively low or excessively high ignition voltage. The EBCM sends a serial data message to the IPC requesting this display.
  4. The estimated temperature of any solenoid coil exceeds an acceptable limit. The EBCM sends a serial data message to the IPC requesting this display.
  5. The EBCM detects a failed brake switch. The EBCM sends a serial data message to the IPC requesting this display. A DTC sets when this condition exists.
  6. The PCM is not able to perform engine torque reduction. The EBCM sends a serial data message to the IPC requesting this display. DTCs set when this condition exists.
  7. The driver manually disables the VSES and engine torque reduction by pressing the traction control switch. The EBCM sends a serial data message to the IPC requesting illumination.
  8. The powertrain control module (PCM) is not able to perform engine torque reduction. The EBCM sends a serial data message to the IPC requesting illumination. DTCs set when this condition exists.
  9. The EBCM detects that the brake fluid level is low or a base brake pressure differential exists. These two conditions are not distinguishable by the EBCM. The EBCM sends a serial data message to the IPC requesting this display.
  10. Serial data communication between the EBCM and any of several other control modules is interrupted. The EBCM sends a serial data message to the IPC requesting this display or the IPC displays the message when communication with the EBCM is interrupted.

Traction Active Message

The drive information center displays the traction active message when engine torque reduction or brake pressure application is required to maintain traction. The EBCM sends a serial data message to the IPC requesting this display.

Traction SYS LIMITED

The drive information center displays the traction LIMITED message when engine torque reduction or brake pressure application is required to maintain traction. The EBCM sends a serial data message to the IPC requesting this display.

Special Tools

Illustration Tool Number/ Description J 29700 100-Pin Breakout Box J 39700-650 Adapter Cable

Scheme 6

Scheme 6: Special Tools
Scheme 6: Special Tools

See also:
• Diagnostic System Check - Vehicle
• Strategy Based Diagnosis
• Diagnostic Procedure Instructions
• COMPONENT CONNECTOR END VIEWS - INDEX
• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs
• Control Module References
• Diagnostic Repair Verification
• Diagnostic Trouble Code (DTC) List - Vehicle
• Symptoms - Lighting
• Steering Wheel Position Sensor or Steering Shaft Lower Bearing Replacement
• Checking Aftermarket Accessories
• Symptoms - Hydraulic Brakes
• Brake Fluid Irritant Warning
• Brake Fluid Effects on Paint and Electrical Components Caution
• Hydraulic Brake System Bleeding (Pressure)
• Lifting and Jacking the Vehicle
• Tire and Wheel Removal and Installation (6-Lug Wheel)
• Battery Inspection/Test
• Master Cylinder Reservoir Filling
• Fastener Caution
• Torsion Bar and Support Assembly Replacement
• Brake Dust Warning
• Front Brake Rotor Replacement (JH6, JH9)
• Leaf Spring Replacement (1500/3500)
• Diagnostic Starting Point - Vehicle
• Instrument Panel Cluster Trim Plate Bezel Replacement
• Driver or Passenger Seat Removal and Installation
• DTC B2745
• ABS Description and Operation