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Tahoe / Yukon Service Manual

DTC C1280 or C1281

Diagnostic Instructions Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach. Diagnostic Procedure Instructions provides an overview of each diagnostic category. DTC Descriptor DTC C1280 Electric Park Brake Availability Status Message Counter Incorrect DTC C1281 Electric Park Brake Application Status Message Counter Incorrect Circuit/System Description The Electronic Brake Control Module/Brake System Control Module contains the logic for the parking brake function. The EBCM/BSCM sends out a EPB availability and application status signal on the high speed GMLAN which is monitored by the Engine Control Module. The ECM uses this information for certain functions associated with the Electronic Transmission Range Selector. The ECM needs to verify that EPB functionality is available for ETRS Critical Fault Mode or Latent Fault Mode. Conditions for Running the DTC The system voltage is between 9–16 V. Conditions for Setting the DTC A supervised periodic message from the electronic brake control module/brake system control modulehas not been received by the engine control module or the engine control module has detected an incorrect message counter. Action Taken When the DTC Sets ETRS Automatic Braking unavailable. If vehicle is in Park when the fault is active, the vehicle may not be able to shift out of Park. Conditions for Clearing the DTC A current DTC clears when the malfunction is no longer present. A history DTC clears when the device ignition cycle counter reaches the reset threshold of 50, without a repeat of the malfunction. Reference Information Schematic Reference Park Brake System Schematics Control Module References Connector End View Reference Master Electrical Component List Description and Operation Data Link Communications Description and Operation Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs Scan Tool Reference Control Module References for scan tool information Circuit/System Testing

  1. Ignition ON.
  2. Verify that no other DTCs are set. ⇒ If any other DTCs are set Refer to Diagnostic Trouble Code (DTC) List - Vehicle. ⇓ If no other DTCs are set
  3. Reprogram the K17 Electronic Brake Control Module/K160  Brake System Control Module. Refer to Control Module References
  4. Ignition ON. Apply and release the park brake.
  5. Verify that DTC C1280 or C1281 is not set. ⇒ If DTC C1280 or C1281 is set 5.1. Replace the K17 Electronic Brake Control Module/K160 Brake System Control Module. 5.2. Ignition ON. 5.3. Verify that DTC C1280 or C1281 is not set. ⇒ If DTC C1280 or C1281 is set, replace the Control Module that set the DTC. ⇓ If DTC C1280 or C1281 is not set 5.4. All OK. ⇓ If DTC C1280 or C1281 is not set
  6. All OK. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair. Control Module References for control module replacement, programming and setup.