Code 71 - EBCM Fault

EBCM has self-diagnostics which can detect internal failure within module. EBCM also monitors supply voltage and integrity of EBCM harness connection.

If a failure is detected and sets a Code 71, anti-lock brake system is disabled and EBCM turns on ANTI-LOCK indicator for remainder of ignition cycle.

If failure is intermittent, EBCM will enable system at next ignition cycle and a History Code 71 will be present.

1. Checks for additional faults which may be causing Code 71.
2. Checks integrity of EBCM ground circuit.
3. Checks for minimum supply voltage necessary for proper ABS operation.
4. Checks for intermittent connections of EBCM harness connector and terminals to EBCM.

Fig 1: Code 71 - Schematic

Courtesy of GENERAL MOTORS CORP.

Fig 2: Code 71 - Diagnostic Flowchart

Courtesy of GENERAL MOTORS CORP.