C0551
DTC C0551
Circuit Description
The electronic brake control module (EBCM) learns the model options that it is installed in by using the Vehicle ID information from the powertrain control module (PCM) via the class 2 serial data line. Each time the vehicle is in the RUN position the PCM communicates this information via class 2. The EBCM internally compares the VIN and option information with that information stored in the PCM.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC C0551 Option Configuration Error
Condition for Running the DTC
* The EBCM detects digit 2-9 of the VIN, and is not zeros.
* The condition must occur when the ignition switch is first turned on.
Conditions for Setting the DTC
* The EBCM detects information from the PCM that the options are incorrect, automatic or manual transmission.
* The condition must occur when the ignition switch is first turned on.
Action Taken When the DTC Sets
If equipped, the following actions occur:
* The EBCM disables the ABS/traction control system (TCS) for the duration of the ignition cycle.
* A DTC malfunction will set.
* The ABS indicator turns
* The traction control indicator turns ON.
* The red brake warning light turns ON.
Conditions for Clearing the DTC
* The EBCM recognizes that information from the PCM is valid information, automatic or manual transmission.
* A history DTC will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present.
Diagnostic Aids
DTC C0551 is set when the EBCM detects a mismatch between itself and the programmed PCM in the vehicle by monitoring the PCM class 2 message.
