Battery, Charging System &amp; Starting System Chevrolet Corvette C6

Description and Operation

Control Module References

Electrical Information Reference

«Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
«Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
«Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Engine running measure and record the voltage at the battery terminals. Verify that the battery voltage is 12.6-15.5 V. If the battery voltage is not within the specified range, refer to «Charging System Test»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system)
Engine running, observe the scan tool BCM Battery Positive Voltage parameter. The reading should be between 12.6 and 15.5 V.

Circuit/System Testing

Ignition OFF. Disconnect the harness connectors at the BCM.
Test for less than 3.0 ohms between the ground circuits terminals listed below and ground. Terminal 12 X1 Terminal E2 X4 If greater than the specified value, test the ground circuit for an open/high resistance.
Ignition ON, verify a test lamp illuminates between the B+ circuit terminals listed below and ground. Terminal D6 X3 Terminal D1 X3 If test lamp did not illuminate, test the B+ circuits for a short to ground or an open/high resistance.
If all the circuits test normal, replace the BCM.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

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

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
B+	B1327	B1327
Ground		B1327

The control modules on this vehicle monitor system voltage through the battery positive voltage circuits. Damage to components, and incorrect data can occur when the voltage is out of range. This vehicle has multiple modules that will set this DTC. For more information on which modules, refer to Diagnostic Trouble Code (DTC) List - Vehicle

This DTC shall run only if the module has power, ground, and the ignition is not in START mode.
This DTC shall execute regardless of the battery voltage.

Conditions for Setting the DTC

This DTC shall be set as current when the voltage falls below 9 V for 1.2 seconds
When the vehicle exits START, the module shall delay checking the voltage for 2 seconds.

A serial data message shall be sent out to notify all other modules of low battery voltage.
The modules disable the setting of U codes and other DTCs.

The DTC will clear current status when the voltage is greater than 9.5 V for 1.2 seconds.
A history DTC will clear after 50 consecutive ignition cycles, if the condition for the malfunction is no longer present.

A low voltage DTC set in multiple modules indicates a concern in the charging system.
A low voltage value in multiple modules indicates a concern in the charging system.

Schematic Reference

Connector End View Reference

Description and Operation

Control Module References

Electrical Information Reference

«Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
«Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
«Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information.

Engine running measure and record the voltage at the battery terminals. The battery voltage is 12.6-15.5 V. If the battery voltage is not within the specified range, refer to «Charging System Test»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system)
Observe the appropriate control module scan tool Battery Positive Voltage parameter. The reading should be between 12.6 and 15.5 V.

Ignition OFF, disconnect the harness connectors at the appropriate control module.
Ignition OFF, test for less than 5.0 ohms between the ground circuit(s) and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
Ignition ON, verify a test lamp illuminates between the B+ circuit and ground. If the test lamp did not illuminate, test the B+ circuit(s) for a short to ground or an open/high resistance.
If the circuit tests normal, replace the appropriate control module.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for the appropriate control module replacement, setup and programming.

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
B+	B1327	B1327

This DTC shall run only if the module has power, ground and the ignition is not in START mode.
This DTC shall execute regardless of the battery voltage.

This DTC shall be set as current when the voltage raises above 16 V for 1.2 seconds.

A message shall be sent out to notify all other modules of high battery voltage.
The modules disable the setting of U codes and other DTCs.

The DTC will clear current status when the voltage is less than 15.5 V for 1.2 seconds.
A history DTC will clear after 50 consecutive ignition cycles if the condition for the malfunction is no longer present.

A high voltage DTC set in multiple modules indicates a concern in the charging system.
A possible cause of this DTC could be overcharging with a battery charger or jump starting.
A high voltage value in multiple modules indicates a concern in the charging system.

Schematic Reference

Connector End View Reference

Description and Operation

Electronic Suspension Control Schematics

Electrical Information Reference

«Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
«Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
«Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information.

Engine running measure and record the voltage at the battery terminals. The battery voltage is 12.6-15.5 V. If the battery voltage is not within the specified range, refer to «Charging System Test»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system)
Observe the appropriate control module scan tool Battery Positive Voltage parameter. The reading should be between 12.6 and 15.5 V. If not within the specified range, replace the appropriate control module.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for the appropriate control module replacement, setup and programming.

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance
B+	C0895	C0895
IGN	C0895	C0895
Ground		C0895

Voltage is supplied to the electronic suspension control (ESC) module through battery positive voltage and the ignition voltage circuits. The ESC module monitors the supplied voltage to determine if it is within a valid operating range.

The Ignition is ON.

The DTC sets when the system voltage is outside the normal range of 9-15.5 V.

Antilock Brake System (ABS) and Traction Control System (TCS) are disabled for the duration of the ignition cycle.
The ABS and TCS indicators illuminates on the IPC.
The DIC displays the SERVICE RIDE CONTROL message.

The DTC is saved as history when the ESC module no longer sees system voltage outside the normal range of 9-15.5 V. The DTC will clear if the fault does not return after 50 consecutive ignition cycles.

A high or low voltage DTC set in multiple modules indicates a concern in the charging system.
A possible cause of this DTC could be overcharging with a battery charger or jump starting.
A high or low voltage value in multiple modules indicates a concern in the charging system.

Schematic Reference

Connector End View Reference

Electronic Suspension Control Description and Operation

Description and Operation

Electrical Information Reference

«Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
«Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
«Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information.

Engine running measure and record the voltage at the battery terminals. Verify that the battery voltage is 12.6-15.5 V. If the battery voltage is not within the specified range, refer to «Charging System Test»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system)
Ignition OFF, disconnect the harness connector at the ESC module.
Ignition OFF, test for less than 5 ohms of resistance between the ground circuit terminal 2 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
Ignition On, verify a test lamp illuminates between the B+ circuit and Ignition circuit listed below. B+ terminal 1 IGN terminal 19 If test lamp did not illuminate, test the B+ or the Ignition circuit for an open/high resistance.
If all circuits test normal, replace the ESC module.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for ESC module replacement, setup and programming

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
B+	C0899	C0899
Ground		C0899

The electronic brake control module (EBCM) monitors the system voltage level available for ABS operation. A low voltage condition prevents the ABS system from operating properly.

Ignition is ON.

This fault will be set if the system voltage to EBCM is less than 9 V for 100 msec.

Antilock Brake System (ABS) and Traction Control System (TCS) are disabled for the duration of the ignition cycle.
The ABS and TCS indicators illuminates on the IPC.
The DIC displays the SERVICE TRACTION SYSTEM message.

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

A low voltage DTC set in multiple modules indicates a concern in the charging system.
A low voltage value in multiple modules indicates a concern in the charging system.

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

ABS Description and Operation

Description and Operation

Electrical Information Reference

«Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
«Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
«Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information.

Engine running, measure and record the voltage at the battery terminals. Verify that the battery voltage is 12.6-15.5 V. If the battery voltage is not within the specified range, refer to «Charging System Test»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system) .
Engine running, observe the scan tool EBCM Battery Positive Voltage parameter. The reading should be between 12.6 and 15.5 V.

Ignition OFF, disconnect the harness connector at the EBCM.
Ignition OFF, test for less than 5.0 ohms between the ground circuit terminals listed below and ground. Terminal E Terminal F If greater than the specified range, test the ground circuits for an open/high resistance.
Ignition ON, verify a test lamp illuminates between the B+ circuits listed below and ground. Terminal A Terminal B Terminal C If test did not illuminate, test the B+ circuits for a short to ground or an open/high resistance.
If the circuits test normal, replace the EBCM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for EBCM replacement, setup and programming

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
B+	C0899	C0899

The electronic brake control module (EBCM) monitors the system voltage. If the voltage level is too high, damage may result in the system. When a high voltage condition is detected the EBCM turns OFF the system relay which removes battery voltage from the solenoid valves and pump motor.

Engine running.

The system voltage is greater than 16 V for 100 msec.

Traction Control System (TCS) and Vehicle Stability Enhancement System (VSES) disabled for the duration of the ignition cycle.
ABS disabled if ignition voltage exceeds 19.5 V.
The TCS indicator turns ON.
The Antilock Brake System (ABS) indicator turns ON if voltage exceeds 19.5 V.
The driver information center (DIC) displays the SERVICE TRACTION SYSTEM message.

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

A possible cause of this DTC could be overcharging with a battery charger or jump starting.
A high voltage DTC set in multiple modules indicates a concern in the charging system.
A high voltage value in multiple modules indicates a concern in the charging system.

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

ABS Description and Operation

Description and Operation

Electrical Information Reference

«Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
«Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
«Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information.

Engine running, measure and record the voltage at the battery terminals. Verify that the battery voltage is 12.6-15.5 V. If the battery voltage is not within the specified range, refer to «Charging System Test»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system) .
Engine running, observe the scan tool EBCM Battery Positive Voltage parameter. The reading should be between 12.6 and 15.5 V. If not within the specified range, replace the EBCM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for EBCM replacement, setup and programming.

Diagnostic Instructions (ECM)

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Diagnostic Fault Information (ECM)

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
IGN I	P0562	P0562
Ground		P0562

Circuit/System Description (ECM)

The engine control module (ECM) monitors the system voltage to ensure that the voltage stays within the proper range. Damage to components, and incorrect data may occur when the voltage is out of range.

Conditions for Running the DTC (ECM)

The vehicle speed is above 8 km/h (5 mph).
The system voltage is between 9.5-18 V.

Conditions for Setting the DTC (ECM)

The ECM detects a system voltage below 10 V for 5 seconds.

Action Taken When the DTC Sets (ECM)

DTC P0562 is a C type DTC.

Conditions for Clearing the DTC (ECM)

DTC P0562 is a C type DTC.

Diagnostic Aids (ECM)

A low voltage DTC set in multiple modules indicates a concern in the charging system.
A low voltage value in multiple modules indicates a concern in the charging system.

Reference Information (ECM)

Schematic Reference

Engine Controls Schematics (LS3) or Engine Controls Schematics (LS7) or Engine Controls Schematics (LS9)

Connector End View Reference

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
«Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
«Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification (ECM)

Engine running, accessories OFF, measure and record the battery voltage at the battery terminals. The voltage should be between 12.6 and 15.5 V. If not within the specified range, refer to «Charging System Test»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system)
Observe the scan tool ECM Ignition 1 Signal parameter. The reading should be between 12.6 and 15.5 V.

Circuit/System Testing (ECM)

Ignition OFF, disconnect the harness connectors at the ECM.
Ignition OFF, and scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 5 ohms between the ground circuit terminals listed below and ground. Terminal 73 X1 (LS3/LS7) Terminal 73 X2 (LS9) Terminal 73 X3 (LS9) If greater than the specified range, test the ground circuits for an open/high resistance.
Ignition On, verify that a test lamp illuminates between the IGN/B+ circuit terminals listed below and ground: Terminal 18 X1 (LS3/LS7) Terminal 19 X1 (LS3/LS7) Terminal 20 X1 (LS3/LS7) Terminal 47 X1 (LS3/LS7) Terminal 20 X1 (LS3/LS7) Terminal 18 X1 (LS9) Terminal 19 X1 (LS9) Terminal 20 X1 (LS9) Terminal 13 X2 (LS9)
If all circuits test normal, replace the ECM.

Repair Procedures (ECM)

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for ECM replacement, setup, and programming

Diagnostic Instructions (FSCM)

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Diagnostic Fault Information (FSCM)

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
B+	P0562	P0562
Ground		P0562

Circuit/System Description (FSCM)

The fuel pump control module (FPCM) monitors the system voltage to ensure that the voltage stays within the proper range. Damage to components, and incorrect data may occur when the voltage is out of range.

Conditions for Running the DTC (FSCM)

The engine is running.

Conditions for Setting the DTC (FSCM)

The FPCM detects that the battery voltage is less than 9 V.

Action Taken When the DTC Sets (FSCM)

DTC P0562 is a type C DTC.

Conditions for Clearing the DTC (FSCM)

DTC P0562 is a type C DTC.

Reference Information (FSCM)

Schematic Reference

Engine Controls Schematics (LS3) or Engine Controls Schematics (LS7) or Engine Controls Schematics (LS9)

Connector End View Reference

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
«Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
«Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing (FSCM)

Engine running, accessories OFF, measure and record the battery voltage at the battery terminals. The voltage should be between 12.6 and 15.0 V. If not within the specified range, refer to «Charging System Test»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system) .
Ignition OFF, disconnect the harness connectors at the FPCM.
Ignition OFF and scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 5 ohms between the ground circuit terminal 1 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
Verify that a test lamp illuminates between the B+ circuit terminal 32 and ground. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
If all circuits test normal, replace the FPCM.

Repair Procedures (FSCM)

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

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

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
IGN I	P0562	P0562
Ground		P0562

The vehicle speed is above 8 km/h (5 mph).
The system voltage is between 9.5-18 V.

The ECM detects a system voltage above 16 V for less than 1 second.

DTC P0563 is a C type DTC.

A high voltage DTC set in multiple modules indicates a concern in the charging system.
A possible cause of this DTC could be overcharging with a battery charger or jump starting.
A high voltage value in multiple modules indicates a concern in the charging system.

Schematic Reference

Engine Controls Schematics (LS3) or Engine Controls Schematics (LS7) or Engine Controls Schematics (LS9)

Connector End View Reference

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
«Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
«Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Engine running, accessories OFF, measure and record the battery voltage at the battery terminals. The voltage should be between 12.6 and 15.5 V. If not within the specified range, refer to «Charging System Test»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system)
Engine running, observe the scan tool ECM Ignition 1 Signal parameter. The voltage should be between 12.6 and 15.5 V. If not within the specified range, replace the ECM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for ECM replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
B+	P0562	P0562
Ground		P0562

The ignition is ON.

The FPCM detects that the system voltage is greater than 18 V.

DTC P0563 is a type C DTC.

Diagnostic Aids (FSCM)

A high voltage DTC in multiple modules indicates a concern in the charging system.
This DTC could be set by overcharging with a battery charger or jump starting.

Schematic Reference

Engine Controls Schematics (LS3) or Engine Controls Schematics (LS7) or Engine Controls Schematics (LS9)

Connector End View Reference

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
«Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
«Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification (FSCM)

Engine running, accessories OFF, measure and record the battery voltage at the battery terminals. The voltage should be between 12.6 and 15.0 V. If not within the specified range, refer to «Charging System Test»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system) .
If all circuits test normal, replace the FPCM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

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

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Control	P0615	P0615	P0615
Ground		P0615

When the ignition mode switch is placed in the START position, a discrete signal is supplied to the body control module (BCM) notifying it that the ignition is in the START position. The BCM then sends a message to the engine control module (ECM) that crank has been requested. The ECM then verifies that the clutch is fully depressed or the automatic transmission is in Park/Neutral. If it is, the ECM then supplies 12 V to the control circuit of the crank relay. When this occurs, battery voltage is supplied through the switch of the crank relay to the starter solenoid.

The Ignition is in the START position.
The system voltage is between 9.5-18 V.

The ECM detects improper voltage on the control circuit of the crank relay.

DTC P0615 is a C type DTC.

Schematic Reference

Connector End View Reference

Starting System Description and Operation

Description and Operation

Electrical Information Reference

«Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
«Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
«Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, verify that no clutch pedal position sensor, brake pedal position sensor, theft deterrent or automatic transmission DTCs are set that would cause the ECM not to enable engine starting.

Ignition OFF, disconnect the crank relay.
Ignition OFF and scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 5.0 ohms between the relay ground circuit terminal 85 and ground. If greater than the specified range, test the relay ground circuit for an open/high resistance.
Ignition OFF, connect a test lamp between the control circuit terminal 86 and the ground circuit terminal 85.
With the transmission range selector in park or neutral, cycle the ignition between the OFF and CRANK position. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always On, test the control circuit for short to voltage. If the circuits test normal replace the ECM. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuits test normal replace the ECM.
If all circuits tests normal, replace the crank relay.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Relay Replacement (Attached to Wire Harness)»(/chevrolet/corvette/c6-2004-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction) or «Relay Replacement (Within an Electrical Center)»(/chevrolet/corvette/c6-2004-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction)
«Control Module References»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Generator Turn ON Signal	P0621	P0621	P0621	P0621

The engine control module (ECM) uses the generator turn on signal circuit to control the load of the generator on the engine. A high side driver in the ECM applies a voltage to the voltage regulator. This signals the voltage regulator to turn the field circuit ON and OFF. The ECM monitors the state of the generator turn on signal circuit. The ECM should detect low voltage on generator turn on signal circuit when the ignition is ON and the engine is OFF, or when the charging system malfunctions. With the engine running, the ECM should detect high voltage on the generator turn on signal circuit. The ECM performs Ignition ON and RUN tests to determine the status of the generator turn on signal circuit.

Ignition ON Test

No generator, crankshaft position (CKP) sensors, or camshaft position (CMP) sensor DTCs are set.
The ignition is in RUN position.
The engine is not running.

Run Test

No generator, CKP sensors, CMP sensor DTCs are set.
The engine is running.

During the Ignition ON test, the ECM detects high voltage on the generator turn on signal circuit for 5 seconds.
During the RUN test, the ECM detects low voltage on the generator turn on signal circuit for 15 seconds.

DTC P0621 is a C Type DTC.

On vehicles equipped with a sense circuit connected to the voltage regulator. This circuit must have voltage for the charging system to operate properly. This circuit is used as a reference to control system voltage. All circuits must be tested at the generator before replacing any components. Refer to Starting and Charging Schematics to confirm if the vehicle being serviced uses the sense circuit as part of the charging system.

Schematic Reference

Connector End View Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
«Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
«Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Ignition OFF, disconnect the harness connector at the generator.
Ignition OFF, test for B+ between the generator sense circuit terminal D and ground. If less than the specified range, test the generator sense circuit for a short to ground, an open/high resistance.
Ignition ON, test for less than 1 volt between the generator turn on signal terminal B and ground. If greater than the specified range, test the generator turn on signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
Engine running, test for greater than 3.5 V between the generator turn on signal and ground. If less than the specified range, test the generator turn on signal circuit for a short to ground, an open/high resistance. If the circuit tests normal, replace the ECM.
If the circuit tests normal, replace the generator.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Generator Replacement (LS3 or LS7)»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system) or «Generator Replacement (LS9)»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system)
«Control Module References»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
B+	P0622	P0622
Generator Field Duty Cycle Signal	P0622	P0622	P0622	P0622

The engine control module (ECM) uses the generator field duty cycle signal circuit to monitor the duty cycle of the generator. The generator field duty cycle signal circuit connects to high side of the field windings in the generator. A pulse width modulated (PWM) high side driver in the voltage regulator turns the field windings ON and OFF. The ECM uses the PWM signal input to determine the generator load on the engine. This allows the ECM to adjust the idle speed to compensate for high electrical loads. The ECM monitors the status of the generator field duty cycle signal circuit. When the ignition is ON and the engine is OFF, the ECM should detect a duty cycle near 0 percent. However, when the engine is running, the duty cycle should be between 5-95 percent.

No generator, crankshaft position (CKP) sensors, or camshaft (CMP) sensor DTCs are set.
Ignition ON engine OFF, for the Ignition ON test.
Engine is running, engine speed less than 3,000 RPM for the RUN test.

Ignition ON engine OFF, the ECM detects a PWM signal that is greater than 65 percent for 5 seconds.
Engine running, the ECM detects a PWM signal that is less than 5 percent for 15 seconds.

DTC P0622 is a C type DTC.

Schematic Reference

Connector End View Reference

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
«Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
«Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Engine running, observe the scan tool ECM GEN-F Terminal Signal parameter. The parameter should read between 10-95 percent.

Ignition OFF, disconnect the harness connector at the generator.
Verify that a test lamp illuminates between the generator output B+ circuit terminal B and ground. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
Ignition ON, verify the scan tool ECM GEN-F Terminal Signal parameter displays less than 5 percent. If greater than the specified range, test the signal circuit terminal C for a short to voltage. If the circuit tests normal, replace the ECM.
Install a 3A fused jumper wire between B+ and the signal circuit.
Verify the scan tool ECM GEN-F Terminal Signal parameter displays greater than 95 percent. If less than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
If the circuit tests normal replace the generator.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Generator Replacement (LS3 or LS7)»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system) or «Generator Replacement (LS9)»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system)
«Control Module References»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
IGN/B+	P129B	P129B
Ground		P129B

The fuel pump control module (FPCM) monitors the system voltage supplied to the fuel pump driver module (FPDM) to ensure that the voltage stays within the proper range. Damage to components, and incorrect data may occur when the voltage is out of range.

The engine is running.

The FPCM detects that the battery voltage supplied to the FPDM is less than 9 V for 5 seconds.

DTC P129B is a type A DTC.

Schematic Reference

Engine Controls Schematics (LS3) or Engine Controls Schematics (LS7) or Engine Controls Schematics (LS9)

Connector End View Reference

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
«Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
«Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Engine running, accessories OFF, measure and record the battery voltage at the battery terminals. The voltage should be between 12.6 and 15.0 V. If not within the specified range, refer to «Charging System Test»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system) .
Ignition OFF, disconnect the harness connectors at the FPDM.
Ignition OFF and scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 5 ohms between the ground circuit terminal 5 X1 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
Verify that a test lamp illuminates between the B+ circuit terminal 3 X1 and ground. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 5 X2 and ground. If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
If all circuits test normal, replace the Fuel Pump Flow Control Module Relay.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Refer to Fuel Pump Flow Control Module Relay Replacement for Fuel Pump Flow Control Module Relay.

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
IGN/B+	P129C	P129C
Ground		P129C

The ignition is ON.

The FPCM detects that the system voltage is greater than 18 V for 5 seconds.

DTC P129C is a type A DTC.

A high voltage DTC in multiple modules indicates a concern in the charging system.
This DTC could be set by overcharging with a battery charger or jump starting.

Schematic Reference

Engine Controls Schematics (LS3) or Engine Controls Schematics (LS7) or Engine Controls Schematics (LS9)

Connector End View Reference

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
«Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
«Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Engine running, accessories OFF, measure and record the battery voltage at the battery terminals. The voltage should be between 12.6 and 15.0 V. If not within the specified range, refer to «Charging System Test»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system) .
If all circuits test normal, replace the FPDM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Refer to Fuel Pump Flow Control Module Relay Replacement for Fuel Pump Flow Control Module Relay.

Symptoms - Engine Electrical

IMPORTANT

The following steps must be completed before using the symptom tables.

Perform «Control Module References»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) 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 descriptions and operations in order to familiarize yourself with the system functions. Refer to one of the following system operations: «Battery Description and Operation»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system) «Charging System Description and Operation»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system) «Load Shed System Description and Operation»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system) «Starting System Description and Operation»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system__starting-system-description-and-operation)

Visual/Physical Inspection

Inspect for aftermarket devices which could affect the operation of the starting and charging systems. Refer to «Checking Aftermarket Accessories»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__checking-aftermarket-accessories) .
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 to 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

«Battery Inspection/Test»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system)
«Battery Electrical Drain/Parasitic Load Test»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system)
«Battery Common Causes of Malfunction»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system__battery-common-causes-of-malfunction)
«Charging System Test»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system)
«Generator Noise Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system)
«Starter Solenoid Does Not Click»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system)
«Starter Solenoid Clicks, Engine Does Not Crank»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system)
«Engine Cranks Slowly»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system__engine-cranks-slowly)
«Starter Noise Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system)

Special Tools

J 42000 Battery Tester. See Special Tools .

WARNING

Refer to Battery Disconnect Warning .

Note. The battery test using the J 42000 Battery Tester requires correct connections to the battery terminals. See Special Tools . A failure to obtain the correct connections during the test may result in a failed test on a good battery. Use the Out of Vehicle test for each battery when testing a vehicle with dual batteries.

Follow these instructions in order to avoid an incorrect diagnosis because of connections

If testing the vehicle with the battery cables still connected, wiggle the J 42000 clips on the terminal bolt. See «Special Tools»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system) . This may cut through any coating or through any oxidation that may be present on the bolt. Even new bolts contain a protective coating that may insulate or cause a resistance in the test circuit.
If correct connections to the battery terminal bolts in the vehicle are in doubt, perform the following steps: Disconnect the negative battery cable. Disconnect the positive battery cable. Install the test adapters on the terminals. Follow the instructions for testing a removed battery.
If the tester displays a REPLACE BATTERY or BAD CELL-REPLACE result for a battery tested in the vehicle with the battery cables connected, perform the following steps: Disconnect the negative battery cable. Disconnect the positive battery cable. Install the tester adapters. NOTE: Always write the test code displayed by the tester on the repair order for any warranty purposes. The number is a unique code that describes the test data for a particular battery at a particular time. The test code may occasionally repeat when you retest the same battery. More often, each test will result in a different code. Use the test code from the second, or Out of Vehicle test. Follow the instructions for testing a removed battery. Replace the battery only if the second test shows a REPLACE BATTERY or BAD CELL-REPLACE result. Use the test code from the second test for any warranty purposes.
Use the correct terminal adapters. Do not use any common bolts or a combination of bolts, of nuts, and of washers as adapters when testing the battery. Use the test adapters that are provided with the J 42000 or GM P/N 12303040 terminal adapters. See «Special Tools»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system) . If the adapters that are provided with the J 42000 require replacement, use GM P/N 12303040. See «Special Tools»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system) . Any other adapter may not contact the correct areas of the battery terminal, causing a resistance that may result in an invalid battery test result.

WARNING

Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

Inspect the battery for a cracked, broken, or damaged case, which may be indicated by battery acid leakage. If there is any apparent damage, replace the battery.
Verify the cold cranking amperage (CCA), and reserve capacity (RC) and/or amp hour (AH) rating of the battery to the original battery or original equipment (OE) specification. Refer to «Battery Usage»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system__battery-usage) . If the battery does not meet or exceed specifications, replace the battery.
Verify that the battery cables are clean and tight. The battery terminal bolts should be torqued as specified in «Fastener Tightening Specifications»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system__fastener-tightening-specifications) . If the battery cable(s) need to be cleaned, clean as required and tighten as specified. If the battery cable(s) are damaged, replace then tighten as specified.
Install the J 42000 and follow directions supplied by the tester. See «Special Tools»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system) . If the tester calls for charging the battery, refer to «Battery Charging»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system) .

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Battery Positive and Negative Cable Replacement (LS3)»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system) or «Battery Positive and Negative Cable Replacement (LS7 or LS9)»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system)
«Battery Replacement (LS7 or LS9)»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system) or «Battery Replacement (LS3)»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system)

J 42000 Battery Tester. See Special Tools .

For best results, use an automatic taper-rate battery charger with a voltage capability of 16 volts.
The charging area should be well ventilated.
Do not charge a battery that appears to be frozen. Allow the battery to warm to room temperature and test it using the J 42000 before charging. See «Special Tools»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system) .

Battery State of Charge

Note. Using voltage to determine the batteries state of charge (SOC) is only accurate after the battery has been at rest for 24 hours. This is enough time for the acid in each cell to equalize. If the battery has been charged or discharged in the past 24 hours, the battery SOC will only be an estimate.

The maintenance-free batteries SOC is estimated by reading the voltage of the battery across the battery terminals. Because the voltage is affected by current flow into or out of the battery, the engine must be stopped and all electrical loads turned OFF, including parasitic loads, when checking the voltage. The voltage can also be affected if the battery has just been charged or discharged, so it is important to consider what has happened to the battery in the time just before testing. Use the following procedure to determine the batteries SOC

Be sure all electrical loads are turned OFF.
Determine whether the battery has been used in a vehicle or charged within the past 12 hours. If the answer is no, the terminal voltage will be stabilized and no action is necessary before reading the voltage. Skip to step 3. If the answer is yes, terminal voltage will not be stabilized and you should wait 12 hours since the last time the battery was used.
Estimate the battery temperature by determining the average temperature to which the battery has been exposed for the past 12 hours.
Measure the battery voltage at the battery terminals. Refer to the following table to determine the SOC according to the estimated battery temperature

Battery Voltage	% Charge at 0°C (32°F)	% Charge at 25°C (75°F)
12.75 V	100%	100%
12.7 V	100%	90%
12.6 V	90%	75%
12.45 V	75%	65%
12.2 V	65%	45%
12.0 V	40%	20%

Use the SOC information as follows

A battery with a SOC that is below 65 percent must always be recharged before returning it to service or continuing storage.
A battery with a SOC that is 65 percent or greater is generally considered to be charged enough in order to be returned to normal service or in order to continue storage. However, if the battery is being used in slow traffic or with short drive times, or if the temperature is very hot or very cold, the battery should be fully charged, to at least 90 percent, before returning it to service or continuing storage.

Charging Time Required

The time required to charge a battery will vary depending upon the following factors

The battery charger capacity-The higher the charger amperage, the less time it will take to charge the battery.
The SOC of the battery-A completely discharged battery requires more than twice as much charging time as a half charged battery. In a discharged battery with a voltage below 11 volts, the battery has a very high internal resistance and may only accept a very low current at first. Later, as the charging current causes the acid content to increase in the electrolyte, the charging current will increase. Extremely discharged batteries may not activate the reversed voltage protection in some chargers. Refer to the manufacturer's instructions for operating this circuitry.
The temperature of the battery-The colder the battery is, the more time it takes to recharge the battery. The charging current accepted by a cold battery is very low at first. As the battery warms, the charging current will increase.

Charging Procedure

CAUTION

Turn OFF the ignition when connecting or disconnecting the battery cables, the battery charger or the jumper cables. Failure to do so may damage the ECM/PCM or other electronic components.

CAUTION

Refer to Fastener Caution .

When charging side-terminal batteries with the battery cables connected, connect the charger to the positive cable bolt and to a ground located away from the battery. When charging side-terminal batteries with the battery cables disconnected, install the battery side terminal adapters and connect the charger to the adapters.

Tighten: Tighten the battery side terminal adapters to 15 N.m (11 lb ft).

Use the following procedure to charge the battery

Turn OFF the charger.
Ensure that all of the battery terminal connections are clean and tight.
Connect the charger positive lead to the battery positive terminal on the battery or the remote jumper stud underhood.
Connect the negative charger lead to a solid engine ground or to a ground stud in the engine compartment that is connected directly to the battery negative terminal, but away from the battery. If the negative battery cable is disconnected and a terminal adapter is being used, connect directly to the adapter.
Turn ON the charger and set to the highest setting for normal charging.
Inspect the battery every half hour after starting the battery charger. Charge the battery until the taper-rate charger indicates that the battery is fully charged. Estimate the battery temperature by feeling the side of the battery. If it feels hot to the touch or its temperature is over 45°C (125°F), discontinue charging and allow the battery to cool before resuming charging.
After charging, test the battery. Refer to «Battery Inspection/Test»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system) .

J 38758 Parasitic Draw Test Switch. See Special Tools .

Be sure to rule out any possible obvious influences, such as customer error or aftermarket equipment.
Customer driving habits, such as regular short trips. This does not allow enough time to properly charge the battery. Refer to «Battery Description and Operation»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system) .
Verify that the battery and charging system are in proper working order. Refer to «Battery Charging»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system) and «Charging System Test»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system) .
A battery discharging for no apparent reason while the vehicle is parked can be caused by an intermittent draw, such as a module waking up, or a continuous draw, such as a dome light or stuck relay.
Some systems and modules such as OnStar®, and regulated voltage control (RVC), if equipped, are designed to wake-up, perform a task, and go back asleep at regular intervals. Refer to «Body Control System Description and Operation»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#data-communication-system) for the system or modules description and operation.
Remote keyless entry (RKE) will wake up due to an outside input. Refer to «Keyless Entry System Description and Operation»(/chevrolet/corvette/c6-2004-2014/remont/door-locks-anti-theft-systems/#keyless-entry-system-and-remote-functions) for the system description and operation.
The battery run down time will vary depending on cold cranking amperage (CCA) and reserve capacity (RC). If the CCA and RC are higher, then the battery run down time would be longer. If the CCA and RC are lower, then the battery run down time would be shorter. The graph below indicates roughly how many days a 690 CCA battery with at 110 min. RC (60.5 AH) starting at 80 percent state of charge will last with a constant current draw until it reaches 50 percent state of charge. Differences in battery rating and temperature will affect the results.

Current Drain	Days
25 mA	30.5
50 mA	16.5
75 mA	11
100 mA	8.25
250 mA	3.3
500 mA	1.65
750 mA	1
1 A	0.8
2 A	0.4

Load Test

WARNING

Refer to Battery Disconnect Warning .

CAUTION

Do not turn the parasitic draw test switch to the OFF position with the engine running. Damage will occur to the vehicle's electrical system.

CAUTION

The test switch must be in the ON position when removing the fuses in order to maintain continuity in the electrical system. This avoids damaging the digital multimeter due to accidental overloading, such as a door being opened to change a fuse.

Note. The test switch on the J 38758 is marked ON and OFF. See Special Tools . When the test switch is in the ON position, the circuit is closed and electrical current will pass through the switch. When the test switch is in the OFF position, the circuit is open and electrical current will not pass through the switch.

Disconnect the battery negative cable from the battery negative terminal. Refer to «Battery Negative Cable Disconnection and Connection (LS7 or LS9)»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system) or «Battery Negative Cable Disconnection and Connection (LS3)»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system) .
Install the male end of the J 38758 to the battery ground terminal. See «Special Tools»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system) .
Turn the J 38758 test switch to the OFF position. See «Special Tools»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system) .
Install the battery negative cable to the female end of the J 38758 . See «Special Tools»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system) .
Turn the J 38758 test switch to the ON position. See «Special Tools»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system) .
Road test the vehicle and activate ALL of the accessories, including the radio and air conditioning. This may take up to 30 minutes.
Park the vehicle. Turn the ignition switch to the OFF position and remove the ignition switch key.
Connect a 10A fused jumper wire to the test switch tool terminals.
Turn the J 38758 test switch to the OFF position. See «Special Tools»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system) . The current now flows through the jumper wire.
Wait 1 minute. If the fuse blows, install an inductive ammeter to locate the current draw.
Turn the test switch to ON and then remove the fused jumper wire.
Set a digital multimeter to the 10A scale.
Connect the digital multimeter to the test switch tool terminals.
Turn the J 38758 test switch to the OFF position. See «Special Tools»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system) . The current flows now through the digital multimeter.
Wait 1 minute. Check and record the current reading. When there is a current reading of 2A or less, turn the J 38758 test switch to the ON position. See «Special Tools»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system) . The electrical current will now pass through the switch. Then switch the digital multimeter down to the 2A scale for a more accurate reading when the J 38758 test switch is turned OFF. See «Special Tools»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system) .
Turn the J 38758 test switch to the OFF position. See «Special Tools»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system) . Wait up to 45 minutes for most vehicles.
Check and record the current reading.
Note the battery reserve capacity, amp hour rating. Refer to «Battery Usage»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system__battery-usage) . Divide the reserve capacity by 4, amp hour rating by 2.4. Compare this to the multimeter milliampere reading taken in the previous step. The parasitic current drain should not exceed this number. Example: If a battery has a reserve capacity of 100 minutes, (60 A/H) the current drain should not exceed 25 mA.
If excessive current drain is not found at this time and there are no other apparent causes, complete the following: Using the MIN/MAX function of the digital multimeter, monitor the parasitic drain overnight or during the day. This will determine if something has been activated during that time frame. CAUTION: The test switch must be in the ON position when removing the fuses in order to maintain continuity in the electrical system. This avoids damaging the digital multimeter due to accidental overloading, such as a door being opened to change a fuse. NOTE: Removing fuses, relays, and connectors to determine the failure area may wake up modules. You must wait for these modules to go to sleep or use the sleep function on the scan tool. When the vehicle has an unacceptable amount of parasitic current drain, remove each fuse one at a time until the current drain falls to an acceptable level. This will indicate which circuit is causing the drain. Refer to «Power Distribution Schematics»(/chevrolet/corvette/c6-2004-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction) to diagnose exactly which part of the suspect circuit is causing the parasitic drain. In some cases a non-fused circuit or component, such as a relay, is the cause of excessive parasitic current drain. Repeat the parasitic current drain test procedure after any repair has been completed to make sure that the parasitic current drain is at an acceptable level. When the cause of the excessive current drain has been located and repaired, remove the J 38758 . See «Special Tools»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system) .
Connect the battery negative cable to the battery negative terminal.

Battery Common Causes of Malfunction

A battery is not designed to last forever. With proper care, however, the battery will provide years of good service. If the battery tests good but still fails to perform well, the following are some of the more common causes

A vehicle accessory was left on overnight.
The driving speeds have been slow with frequent stops, stop-and-go driving, with many electrical accessories in use, particularly air conditioning, headlights, wipers, heated rear window, cellular telephone, etc.
The electrical load has exceeded the generator output, particularly with the addition of aftermarket equipment.
Existing conditions in the charging system, including the following possibilities: A slipping belt A bad generator
The battery has not been properly maintained, including a loose battery hold down or missing battery insulator if used.
There are mechanical conditions in the electrical system, such as a short or a pinched wire, attributing to power failure. Refer to «General Electrical Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis) .

Electrolyte Freezing

The freezing point of electrolyte depends on its specific gravity. A fully charged battery will not freeze until the ambient temperature gets below -54°C (-65°F). However, a battery with a low state of charge may freeze at temperatures as high as -7°C (20°F). Since freezing may ruin a battery, the battery should be protected against freezing by keeping it properly charged above 80 percent state of charge, the freezing point of the battery will be somewhere below -32°C (-25°F).

Battery Protection During Vehicle Storage

Certain devices on the vehicle maintain a small continuous current drain, parasitic load, on the battery. A battery that is not used for an extended period of time will discharge. Eventually permanent damage will result. Discharged batteries will also freeze in cold weather. Refer to Battery Inspection/Test .

In order to maintain the battery state of charge while storing the vehicle for more than 30 days

WARNING

Refer to Battery Disconnect Warning .

Disconnect the battery ground cable to protect the battery from discharge by parasitic current drains.

When the battery cannot be disconnected

Maintain a high state of charge.
Establish a regular schedule for recharging the battery every 20-45 days.

A battery that has remained in a discharged state for a long period of time is difficult to recharge or may be permanently damaged.

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Description and Operation

Testing for Intermittent Conditions and Poor Connections

Electrical Information Reference

Engine ON, observe the charge indicator on the instrument panel cluster (IPC) or message in the driver information center (DIC). The charge indicator on the IPC should be turned OFF and the DIC should not display charging system message.

If the charge indicator is not on the IPC or a charging system message is not displayed on the DIC, refer to «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis) .

If the charge indicator is on the IPC or a charging system message is displayed on the DIC, refer to «Circuit/System Testing»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system) .

Ignition ON, verify that no generator or battery current sensor DTCs are set that would cause a charging system concern. If DTCs are set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-trouble-code-dtc-list) .
Ignition OFF, measure the voltage across the battery terminals. The voltage should read 12.0 V or greater at room temperature. If not within specified value, refer to «Battery Inspection/Test»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system) .
Connect a carbon pile tester to the battery.
Start the engine and increase the engine speed to 2,500 RPM. Observe the voltage reading on the tester. The voltage should read between 12.6-15.0 V. If not within specified range, replace the generator.
Adjust the carbon pile tester to the specified load test output value, refer to «Generator Usage»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system__generator-usage) . If not within specified value, replace the generator.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Generator Replacement (LS3 or LS7) or Generator Replacement (LS9)

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Noise from a generator may be due to electrical or mechanical noise. Electrical noise or magnetic whine usually varies with the electrical load placed on the generator and is a normal operating characteristic of all generators. When diagnosing a noisy generator, it is important to remember that loose or misaligned components around the generator may transmit the noise into the passenger compartment and that replacing the generator may not solve the problem.

Start the engine, verify the noise can be heard. Compare the concern to a similar vehicle.
Inspect the generator, generator mounting, wiring harness, heater hoses, A/C lines or other accessory equipment that may be misrouted or be the cause of noise being transmitted into the passenger compartment.
Ignition OFF, remove the engine drive belt. Verify the generator, idler pulley and tensioner pulley spin freely. If any of the pulleys do not spin freely, replace the affected component.
Loosen all generator mounting bolts and ensure the generator is properly aligned. Tighten mounting bolts to specification, refer to «Generator Replacement (LS3 or LS7)»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system) or «Generator Replacement (LS9)»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system) .

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Drive Belt Replacement - Accessory (w/o LS9)»(/chevrolet/corvette/c6-2004-2014/remont/mechanical/#engine-mechanical-62l-or-70l-2-of-8) or «Drive Belt Replacement - Accessory (LS9)»(/chevrolet/corvette/c6-2004-2014/remont/mechanical/#engine-mechanical-62l-or-70l-2-of-8)
«Drive Belt Tensioner Replacement - Accessory (w/o LS9)»(/chevrolet/corvette/c6-2004-2014/remont/mechanical/#engine-mechanical-62l-or-70l-2-of-8)
«Drive Belt Idler Pulley Replacement (LS9)»(/chevrolet/corvette/c6-2004-2014/remont/mechanical/#engine-mechanical-62l-or-70l-2-of-8) or «Drive Belt Idler Pulley Replacement (w/o LS9)»(/chevrolet/corvette/c6-2004-2014/remont/mechanical/#engine-mechanical-62l-or-70l-2-of-8)
«Generator Replacement (LS3 or LS7)»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system) or «Generator Replacement (LS9)»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system)

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage
B+ terminal 30	1	1
ECM Park/Neutral Signal	2	1
Coil Control terminal 86		1	3
Control Output terminal 87	1	1	3
Coil Ground terminal 85		1
1. No crank 2. Cranks in any gear 3. Cranks all the time

When the ignition mode switch is placed in the START position, a discrete signal is supplied to the body control module (BCM) notifying it that the ignition is in the START position. The BCM then sends a serial data message to the engine control module (ECM) that crank has been requested. The ECM then verifies that the clutch is fully depressed or the automatic transmission is in Park/Neutral. If it is, the ECM then supplies 12 V to the control circuit of the crank relay. When this occurs, battery voltage is supplied through the switch of the crank relay to the starter solenoid.

Schematic Reference

«Starting and Charging Schematics»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system)
«Automatic Transmission Controls Schematics»(/chevrolet/corvette/c6-2004-2014/remont/automatic-trans/#automatic-transmission-6l80-introduction)

Connector End View Reference

Starting System Description and Operation

Description and Operation

Electrical Information Reference

«Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
«Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
«Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, verify that no starter relay, clutch pedal position sensor, brake pedal position sensor, theft deterrent, or automatic transmission DTCs are set that would cause the ECM to disable engine starting. If DTCs are set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-trouble-code-dtc-list)
Ignition ON, observe the scan tool BCM Current Power Mode parameter. Place ignition mode switch in the crank position, the parameter should display Crank Request. If not the specified value, refer to «Power Mode Description and Operation»(/chevrolet/corvette/c6-2004-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction)
Ignition ON, observe the scan tool ECM clutch pedal parameter, verify the scan tool parameter displays Applied/Released while depressing and releasing the clutch pedal. If the clutch pedal parameter does change. Refer to «Clutch Pedal Position Sensor Learn»(/chevrolet/corvette/c6-2004-2014/remont/manual-trans/#manual-transmission-tremec-6-speed__clutch-pedal-position-sensor-learn)
Transmission range selector in park, verify the scan tool ECM PNP Switch and TCM IMS parameters display Park/Neutral. If the TCM IMS parameter does not indicate Park/Neutral. Refer to «Transmission Internal Mode Switch Logic»(/chevrolet/corvette/c6-2004-2014/remont/automatic-trans/#automatic-transmission-6l80-introduction__transmission-internal-mode-switch-logic) If the ECM Park/Neutral parameter does not indicate Park/Neutral. Refer to «ECM Park Switch Circuit Malfunction (6L50-E/6L80-E/6L90-E)»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system__ecm-park-switch-circuit-malfunction-6l50-e6l80-e6l90-e) .
Transmission range selector in park or neutral, or clutch pedal fully depressed attempt to start the vehicle. The crank relay should click and the engine should begin cranking. If the crank relay does not click or the engine does not crank, refer to «Crank Relay Circuit Malfunction»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system__crank-relay-circuit-malfunction) .

ECM Park Switch Circuit Malfunction (6L50-E/6L80-E/6L90-E)

Ignition OFF, disconnect the harness connector at the AT Inline 16-Way (6L50-E/6L80-E/6L90-E) at the transmission.
Ignition ON, test for B+ between terminal 3 and ground. (note this circuit will not light a test lamp). If not the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
If all circuits test normal, test or replace the internal mode switch (IMS).

Crank Relay Circuit Malfunction

Ignition OFF, disconnect the crank relay.
Ignition OFF, test for less than 5.0 ohms between the relay ground circuit terminal 85 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
Ignition ON, verify a test lamp illuminates between the relay switch B+ circuit terminal 30 and ground. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
Ensure the parking brake is applied and the transmission is in NEUTRAL on manual transmission or PARK on automatic transmissions. Momentarily install a 40A fused jumper wire between the B+ circuit terminal 30 and the control output circuit terminal 87. The starter solenoid should engage and the engine should begin cranking. If the solenoid does not engage, test the control output circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the starter motor.
Connect a test lamp between the coil control circuit terminal 86 and the coil ground circuit terminal 85.
With the transmission range selector in park/neutral, or the clutch pedal fully depressed, place the ignition mode switch between the OFF and CRANK position. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the ECM. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
If all circuits test normal, test or replace the crank relay.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Manual Shift Shaft Position Switch Replacement»(/chevrolet/corvette/c6-2004-2014/remont/automatic-trans/#how-to-overhaul-the-automatic-transmission-6l80-removal-installation-service-troubleshooting-diagnosis)
«Relay Replacement (Attached to Wire Harness)»(/chevrolet/corvette/c6-2004-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction) or «Relay Replacement (Within an Electrical Center)»(/chevrolet/corvette/c6-2004-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction)
«Control Module References»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Schematic Reference

Connector End View Reference