AutoDiag

C0265

EBCM Motor Relay Circuit

Moderate· Fix soonProfessionalChassisManufacturer: GM (Chevrolet, GMC, Buick, Cadillac)

What it means

On GM vehicles the electronic brake control module (EBCM) has detected a problem with the relay that powers the ABS pump motor.

Is it safe to drive?

Normal brakes work, but ABS and traction control are off. Drive carefully.

Symptoms

  • ABS and traction lights on

Probable causes

Most likely first

  1. 1Failed EBCM (internal relay)
  2. 2Poor ground or power to the EBCM
  3. 3Corroded connector

How to diagnose it

Work through these in order before buying parts

  1. 1Record the code and its freeze frame data (speed, load, temperature when it set), then clear it and see if it comes back.
  2. 2Check EBCM power and ground connections.
  3. 3Check for technical service bulletins (TSBs) or software updates for your make and model; some codes have known factory fixes.

Common fixes

  • Repair power or grounds
  • Replace or rebuild the EBCM

This information is general guidance for the listed makes. Exact causes, specifications and procedures vary by vehicle, so confirm with your service manual or a qualified mechanic before replacing parts.