EBCM Motor Relay Circuit (ABS Pump Motor Relay) -- Low When On
The C0265 code means the vehicle's onboard diagnostic system has detected: EBCM Motor Relay Circuit (ABS Pump Motor Relay) -- Low When On. This is a critical severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $30 - $1000 (parts and labor)
Common Misconceptions / Fact Check
-
Commonly claimedGuides often tell you to swap the EBCM relay in the fuse box for C0265.
VerifiedOn the GM trucks that throw C0265 there is no plug-in relay to swap -- the motor relay is soldered inside the EBCM. The real fix is almost always resoldering cracked internal solder joints (or rebuilding the module), not a fuse-box relay.
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Common Symptoms
- ABS warning light on
- Traction control light on
- Stability control disabled
- Service brake assist message
- All electronic brake functions disabled
Probable Causes (Ranked by Likelihood)
- Cracked internal solder joints at the EBCM motor-relay/power pins (most common on GMT800/900 trucks and SUVs) Very High
- Failed internal EBCM motor relay (relay is soldered inside the module, not a plug-in part) High
- Corroded or loose EBCM main power/ground connector Moderate
- Power supply wiring fault to the EBCM Moderate
- Poor ground connection at the EBCM Low
Step-by-Step Diagnostic Procedure
-
Confirm the code and check for related C0266/C0267 pump-motor codes with a scan tool
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Test for battery voltage and good ground at the EBCM main power/ground connector with the ignition on
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Inspect the EBCM connector and pins for corrosion, looseness, or damage (the motor relay is internal to the module, not a plug-in part)
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If power, ground, and connector are good, the fault is almost always cracked internal solder joints -- resolder the EBCM relay/power pins or have the module rebuilt/replaced
-
Verify chassis ground integrity for the brake system
Common Fixes by Vehicle
What techs usually find when diagnosing C0265 on specific vehicles — tap your vehicle for the fix and the exact part:
2007-2014 Chevrolet Silverado/GMC Sierra 1500 hard DIY
EBCM (Electronic Brake Control Module) motor relay circuit failure is a known issue on these trucks. The EBCM is mounted on the ABS hydraulic unit under the hood. The internal relay solders crack from vibration. Some shops offer EBCM rebuild services for less than a new unit. If replacing, the new EBCM must be programmed with a GM Tech2 or equivalent to configure the brake configuration.
Labor: 2-3 hours2007-2017 Chevrolet Tahoe/Suburban/Yukon hard DIY
Same EBCM failure as the trucks. A temporary fix is to remove the EBCM, re-solder the cracked relay joints (requires soldering experience and opening the module), and reinstall. YouTube has detailed teardown videos. If the ABS pump motor itself has seized, the entire ABS modulator assembly needs replacement. A seized motor will be hot to the touch after driving.
Labor: 2-4 hours2006-2013 Chevrolet Corvette C6 hard DIY
The C6 Corvette EBCM fails at a high rate. The unit is under the rear of the car. GM extended the warranty on some 2006-2009 models via Customer Satisfaction Program 10240. Check with a dealer for coverage. Aftermarket EBCM repair services (Module Master, BBA Reman) can rebuild the unit for roughly half the cost of a new one.
Labor: 2-3 hoursFrequently Asked Questions
What is the EBCM?
The Electronic Brake Control Module is the computer that controls ABS, traction control, and stability control. It processes sensor data and commands the ABS hydraulic modulator valves and pump.
Can I just replace the relay?
On these GM vehicles the motor relay is soldered inside the EBCM, so it cannot be swapped like a fuse-box relay. After ruling out the EBCM power, ground, and connector, the fault is almost always cracked solder joints on the module's circuit board. The low-cost fix is resoldering those joints (DIY if you have a soldering iron, or roughly $130 through an EBCM rebuild service) rather than buying a new module for around $1,000.
Is the EBCM the same as the ABS module?
The EBCM is the electronic portion of the ABS system. It is often bolted to the ABS hydraulic modulator. On some vehicles they can be separated; on others they are sold as one unit.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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