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DTC C0265 Or DTC C0266: EBCM Relay Circuit

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2001 GMC Savana Special, 2001 GMC Savana Camper Special, 2001 GMC Savana, 2001 Chevrolet Chevy Express, and 2000 GMC Savana Special. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform diagnostic system check. See DIAGNOSTIC SYSTEM CHECK  under DIAGNOSIS & TESTING. After performing diagnostic system check, go to next step.
  2. Using scan tool, clear DTC(s). Using scan tool, perform ABS relay test. If DTC C0266 is set, go to step  7 . If DTC C0266 is not set, go to next step.
  3. If DTC C0265 is set, go to next step. If DTC C0265 is not set, problem is intermittent.
  4. Turn ignition off. Disconnect EBCM harness connector which contains the battery positive voltage circuit. Connect a test light between a good ground and EBCM harness connector battery positive voltage circuit. If test light illuminates, go to step  6 . If test light does not illuminate, go to next step.
  5. Repair open in battery positive voltage circuit. After repairs, go to step  8 .
  6. Check for poor connections at EBCM harness connector. Repair as necessary. After repairs, go to step  8 . If connections are okay, go to next step.
  7. Replace EBCM and perform tire size calibration using scan tool. After replacing EBCM, go to next step.
  8. Using scan tool, clear DTCs. Operate vehicle at speeds greater than 4 MPH. Recheck DTCs. If DTC resets, go to step  2 . If DTC does not reset, system is okay.
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