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 U1FFF: Electronic Brake Control Module (EBCM) Indicated Communication MalfunctionCircuit/System Description
The electronic control module (ECM) will set this DTC when the electronic brake control module (EBCM) detects a loss of commincations with the ECM, transmission control module (TCM), or body control module (BCM). This DTC will only set with other loss of communcations DTCs.
Conditions for Running the DTC
The ignition switch is in the ON position and the engine is running.
Conditions for Setting the DTC
The EBCM detects a loss of communications.
Action Taken When the DTC Sets
One or more of the following actions may occur:
| • | The Antilock Brake System (ABS)/dynamic rear proportion (DRP) are disabled. |
| • | The ABS/TCS/ESC indicators turn ON. |
| • | The MIL Warning indicator turns ON. |
Conditions for Clearing the DTC
| • | The condition for the DTC is no longer present and the DTC is cleared for the ECM or EBCM with a scan tool. |
| • | The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles. |
Reference Information
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
Antilock Brake System Connector End Views
Description and Operation
Electrical Information Reference
Scan Tool Reference
Scan Tool Data List for EBCM
Circuit/System Verification
DTC U1FFF will set with additional DTCs as result of EBCM communications failure.
Verify that the DTC U1FFF is set, and diagnoses any additional U codes.
| ⇒ | Refer to Diagnostic Trouble Code (DTC) List - Vehicle. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for EBCM
