OBD Guide

C0266

EBCM Motor Relay Circuit High When Off

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • The ABS/ESP indicator on the dashboard is on
  • Incorrect operation of the anti-lock braking system
  • Reduced braking performance
  • Errors in other vehicle systems

Causes

  • Faulty EBCM relay
  • Short circuit in wiring harness
  • Problems with the EBCM module
  • Corrosion of contacts or connectors
  • Power or grounding problems

How to Fix

  1. Check the condition of the EBCM relay and replace if necessary.
  2. Inspect the wiring harness for damage or short circuits.
  3. Check contacts and connectors for corrosion or oxidation
  4. Test the EBCM module for faults
  5. Check the integrity of the power supply and grounding circuits

Related codes

Error C0266 by Vehicle Brand