C1236

Circuit Description
The EBCM monitors the voltage level available for system operation. A low voltage condition prevents the system from operating properly.

Conditions for Running the DTC
^ The vehicle speed is greater than 8 km/h (5 mph).
^ The ignition voltage is less than 10.5 volts.
^ The system relay is commanded ON.

Conditions for Setting the DTC
One of the following conditions exists for 0.72 seconds:
^ During initialization or when the system is inactive, the system voltage is less than 10.5 volts.
^ During the system operation, the system voltage is less than 9.0 volts.

Action Taken When the DTC Sets
If equipped, the following actions occur:
^ The EBCM disables the ABS/TCS/VSES for the duration of the ignition cycle.
^ The ABS indicator turns ON.
^ The TRACTION CONTROL indicator turns ON.
^ The DIC displays the SERVICE STABILITY SYS message.
^ The DRP does not function optimally, or with ignition voltage less than 8.5 volts, the EBCM disables the DRP.
^ When the EBCM disables the DRP, the following actions also occur:
- DTC C1248 sets.
- The red BRAKE warning indicator turns ON.

Conditions for Clearing the DTC
^ The condition for the DTC is no longer present (the DTC is not current) and you used the scan tool Clear DTC function.
^ The condition for the DTC is no longer present (the DTC is not current) and you used the On-Board Diagnostics Clear DTC function.
^ The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Diagnostic Aids
^ Test the charging system. Refer to A Diagnostic System Check - Starting and Charging in Starting and Charging.
^ Possible causes of this DTC are the following conditions:
^ A charging system malfunction
^ An excessive battery draw
^ A weak battery
^ A faulty system ground

Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. This step uses the scan tool to inspect the voltage to the EBCM.
3. This step uses the scan tool to inspect the voltage to the Dash Integration Module (DIM). A low voltage value in multiple modules indicates a concern in the charging system.
5. This step verifies that the condition is still present.