DTC 71 - EBCM Fault: Notes

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

DTC 71 will set when EBCM detects an internal fault or pump motor supply circuit is open or shorted to ground (open fuse).

If a failure is detected and sets a DTC 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 DTC 71 will be present.

Fig 1: DTC 71 Diagnostic Flow Chart

Courtesy of GENERAL MOTORS CORP.

1. Checks for good connections from harness to EBCM.
2. Checks to see if fault was false. If DTC 71 resets, replace EBCM.