Code 155 - EBTCM Malfunction

Identifies internal malfunction detected by EBTCM TCS motor driver interface custom integrated circuit. When code is set, TCS is disabled and TCS warning light is illuminated. The BRAKE warning light is illuminated if rear ABS motor is not in home position.

NOTE: Test numbers refer to numbers on diagnostic chart. Use only 10-megohm (minimum) DVOM for all voltage and resistance tests.

Checks to see if malfunction is still present.
Checks to see if malfunction is intermittent.

Fig 1: Code 155 Flow Chart (W/TCS)

Courtesy of GENERAL MOTORS CORP.