C0265
EBCM Motor Relay Circuit Malfunction
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Code C0265 indicates a malfunction in the Electronic Brake Control Module's internal motor relay circuit. This relay controls the flow of battery voltage to the ABS pump motor, which is responsible for restoring brake pressure during anti-lock braking and traction control events. This is one of the most common ABS codes on GM trucks, SUVs, and full-size vehicles.
The most frequent cause is cracked solder joints on the relay inside the EBCM, a well-known issue particularly on Kelsey-Hayes 325 ABS modules used in many GM vehicles from the late 1990s through 2000s. A telltale symptom is the ABS pump motor running continuously even after the ignition is turned off, which can drain the battery. The ABS, traction control, and stability systems will all be disabled.
Some specialty shops offer EBCM repair services where they open the module and reflow or replace the cracked solder joints, which is significantly cheaper ($100-$250) than replacing the entire module ($400-$800+ with programming). If you're handy with a soldering iron, this is a feasible DIY project. Otherwise, have a shop diagnose whether the problem is the relay, the pump motor, or the wiring before committing to a full EBCM replacement.
Severity
Symptoms
- •ABS warning light on dashboard
- •Brake warning light illuminated
- •Traction control and stability control disabled
- •ABS pump motor may run continuously even with ignition off
- •Soft or spongy brake pedal feel
- •Brakes may lock up during hard stops
Likely Causes
The relay inside the EBCM that controls battery voltage to the ABS pump motor is the most common failure point. Cracked solder joints on the relay are extremely common, especially on GM vehicles with Kelsey-Hayes 325 modules.
A shorted or seized pump motor can draw excessive current, causing the EBCM to detect a relay circuit fault and set this code.
Poor ground connections or corroded wiring at the EBCM can cause voltage irregularities that mimic a relay circuit failure.
Beyond just the relay, the EBCM circuit board can develop cracked solder joints on other components that affect the relay control circuit.
Estimated Cost
Professional Repair
Includes parts + labor
Common Fixes
- Repair or reflow solder joints on the EBCM circuit board relay
- Replace the EBCM module
- Replace the ABS pump motor if seized or shorted
- Clean and repair ground connections at the EBCM
- Replace the complete ABS modulator and EBCM assembly