C1236

DTC 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 10.8 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 10.8 volts.
^ During the system operation, the system voltage is less than 9.36 volts.

Action Taken When the DTC Sets
If equipped, the following actions occur:
^ The EBCM disables the ABS/TCS until the DTC becomes a history DTC.
^ The DRP does not function optimally, or with system voltage less than 8.5 volts, the EBCM disables the DRP for the duration of the ignition cycle.
^ The ABS indicator turns ON.
^ The Traction Off indicator turns ON.
^ The message center displays the Service Traction System message.

Conditions for Clearing the DTC
^ The condition for the DTC is no longer present and you used the scan tool 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.
^ 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
2. Use the scan tool in order to inspect the voltage to the EBCM.
3. Use the scan tool in order to inspect the voltage to the body control module. A low voltage value in multiple modules indicates a concern in the charging system.
5. Verifies that the condition is still present.