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Shift Interlock System: Diagnosis Chevrolet Traverse I

Automatic Trans ~687 words

DIAGNOSTIC CODE INDEX

DTCDescription
DTC B2705B2705 02: Gearshift Unlock Circuit Short to Ground

DIAGNOSTIC CODE INDEX

Diagnostic Instructions

  1. Perform the «Diagnostic System Check - Vehicle»(ref-365273-S03182733772010070600000) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(ref-365273-S36821411302010070600000) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(ref-365273-S42262158172010070600000) provides an overview of each diagnostic category.

Diagnostic Fault Information

CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Ground1
ControlB2705 02, 112
1. Shift lever will not move from PARK with the brake pedal pressed. 2. Shift lever will move from PARK without pressing on the brake pedal.

Conditions for Running the DTC

  1. The ignition switch is in the ON position.
  2. The brake pedal is pressed.
  3. The transmission is in the PARK position.

Conditions for Setting the DTC

The DTC sets if there is a short to ground in the automatic transmission shift lock control solenoid control circuit.

Action Taken When the DTC Sets

The BCM will not attempt to enable the voltage supply circuit of the automatic transmission shift lock control solenoid until the next key cycle.

Conditions for Clearing the DTC

  1. A current DTC B2705 will clear when the malfunction is no longer present and the ignition switch is cycled.
  2. All BCM history codes will clear after 100 ignition cycles with no current codes active during the 100 ignition cycles.

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the shift lock control solenoid.
  2. Ignition OFF, test for less than 1 ohm between the ground circuit terminal F and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Install a test lamp between the ground circuit terminal F and the control circuit terminal E.
  4. Ignition ON, command the scan tool BCM Brake To Shift Control output control ON and OFF. The test lamp should turn ON and OFF as commanded. If the test lamp is always ON, test the control circuit for short to voltage. If the circuit tests normal, replace the BCM. If the test lamp is always OFF, test the control circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  5. If all circuits test normal, replace the shift lock control solenoid.

Component Testing

  1. Install a 10 A fused jumper wire between the control circuit terminal E and 12 volts. Install a jumper wire between the ground circuit terminal F and ground.
  2. Verify the solenoid turns ON and OFF. If the function does not perform as specified, replace the shift lock actuator.

Visual/Physical Inspection

  1. Inspect for aftermarket devices which could affect the operation of the automatic transmission shift lock control. Refer to «Checking Aftermarket Accessories»(ref-365275-S25618774722010070600000) .
  2. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Symptom List

Refer to Transmission Control Lever Malfunction in order to diagnose the symptom.

  1. Perform the «Diagnostic System Check - Vehicle»(ref-365273-S03182733772010070600000) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(ref-365273-S36821411302010070600000) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(ref-365273-S42262158172010070600000) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Ground1
ControlB2705 02, 112
1. Shift lever will not move from PARK with the brake pedal pressed. 2. Shift lever will move from PARK without pressing on the brake pedal.

Diagnostic Aids

If the automatic transmission shift lock control circuit is shorted to B +, the A/T shift lock solenoid will be inoperative. The vehicle will shift out of PARK without depressing the brake pedal.

  1. Ignition OFF, disconnect the harness connector at the automatic transmission shift lock actuator.
  2. Ignition OFF, test for less than 1 ohm between the ground circuit terminal F and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Connect a test lamp between the control circuit terminal E and ground.
  4. Ignition ON, command the scan tool BCM Shift Lock Solenoid output control ON and OFF. The test lamp should turn ON and OFF as commanded. If the test lamp is always ON, test the control circuit for a short to voltage. If all circuits test normal, replace the BCM. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If all circuits test normal, replace the BCM.
  5. If all circuits test normal, test or replace the shift lock actuator.
  1. Install a 10 A fused jumper wire between the control circuit terminal E and 12 volts. Install a jumper wire between the ground circuit terminal F and ground.
  2. Verify the solenoid turns ON and OFF. If the function does not perform as specified, replace the shift lock actuator.

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