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 greater than 17 volts.

ACTION TAKEN WITH 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
^ If an intermittent malfunction exists refer to Intermittents and Poor Connections Diagnosis in Diagnostic Aids.
^ Test the charging system.
^ A possible cause of this condition is overcharging.

TEST DESCRIPTION
The numbers below refer to step numbers on the diagnostic table.
2. This step checks to see what the EBTCM is reading as the voltage.
3. This step checks the actual battery voltage.