C1237

DTC C1237 High System Supply Voltage






Circuit Description

The circuit detects high vehicle voltage levels to the solenoid relay. High voltage may cause damage to the system.

Conditions for Setting the DTC

All of the following conditions occur:

- The vehicle speed is greater than 8 km/h (5 mph).
- The battery positive voltage (B+) is less than 10.5 volts.

Action Taken When the DTC Sets

- A malfunction DTC is stored.
- The ABS/TCS/Stabilitrak is disabled.
- The ABS indicator is turned ON.
- The TRACTION CONTROL indicator is turned ON.
- The DIC displays the SERVICE STABILITY SYS message.

Conditions for Clearing the DTC

- The condition for DTC is no longer present and you used scan tool Clear DTCs function.
- The condition for DTC is no longer present and you used the On-Board Clear DTCs function.
- The EBTCM does not detect the DTC in 50 drive cycles.

Diagnostic Aids

- Test the battery for overcharging.
- Thoroughly inspect the wiring and the connectors. Failure to thoroughly inspect the wiring and the connectors may result in misdiagnosis. Misdiagnosis may result in replacement of non-faulty components and reoccurrance of the malfunction.
- If an intermittent malfunction is detected refer to Intermittents and Poor Connections.
- Inspect for other low voltage conditions.
- Test the charging system.

Test Description

The numbers below refer to step numbers on the diagnostic table.

4. Checks to see what the EBTCM is reading as the voltage.
6. Checks the actual battery voltage.