C1256

DTC C1255 or C1256





Circuit Description
This DTC identifies a malfunction within the electronic brake control module (EBCM).

DTC Descriptors
This diagnostic procedure supports the following DTCs:
^ DTC C1255 Loss of Class 2 Communication
^ DTC C1256 EBCM/EBTCM Internal Malfunction

Conditions for Running the DTC
The ABS conditions and the braking conditions are normal.

Conditions for Setting the DTC
An internal EBCM malfunction exists.

Action Taken When the DTC Sets

C1255
If equipped, the following actions occur:
^ The EBCM disables the DRP/ABS/TCS for the duration of the ignition cycle.
^ The EBCM disables the variable effort steering (VES) for the duration of the ignition cycle.
^ The EBCM temporarily suspends the TIM monitoring function while the DTC is set.
^ The ABS indicator turns ON.
^ The Traction Off indicator turns ON.

C1256
^ The ABS remains functional.
^ The ABS indicator remains OFF.

Conditions for Clearing the DTC
^ The condition for the DTC is no longer present and the DTC is cleared with a scan tool.
^ The electronic brake control module (EBCM) automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Diagnostic Aids
The scan tool displays 2 additional characters after the DTC. Take note of the 2 character code and any other DTCs that are set. The 2 character code is an engineering aid used in order to determine the cause of the internal malfunction.

Test Description
The number below refers to the step number on the diagnostic table.
2. Determines whether the DTC is current.