C0265: How to Diagnose & Fix — EBCM Motor Relay Circuit Low When On
4 vehicles · 2 makes · $100-$1,200 repair
How to diagnose and fix C0265: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
Cadillac Eldorado · 1992–2002
The Teves Mark IV ABS modulator assembly develops internal leaks and electronic failures, disabling ABS and traction control. The modulator is expensive and integrates the hydraulic pump, valves, and electronic controller into one unit. Moisture intrusion into the electrical connector accelerates failure.
Common Symptoms
- ABS light on
- Traction control disabled message
- Brake pedal drops under ABS activation
- ABS motor runs continuously for short periods
How to Fix
The ABS modulator can be sent to a specialty rebuilder for significantly less than dealer replacement cost. Apply dielectric grease to all electrical connectors during reinstallation. Bleed the ABS system using a scan tool to cycle the pump and valves. Inspect the wheel speed sensors and tone rings during the repair.
Sources for this issue (1)
Chevrolet Monte Carlo · 2000–2007
The Electronic Brake Control Module (EBCM) mounted on the ABS hydraulic unit is prone to failure due to internal solder joint cracking from vibration and thermal cycling. When it fails, ABS, traction control, and stability control all stop functioning. The brake warning light, ABS light, and traction control light all illuminate.
Common Symptoms
- ABS light on
- Traction control light on
- Service stability system message
- Loss of ABS function
- Brake pedal pulsation during normal braking
How to Fix
The EBCM can be sent to a rebuilder for solder repair and reprogramming, which is more affordable than dealer replacement. Alternatively, replace the ABS modulator assembly. After replacement, the module must be programmed to the vehicle VIN. Bleeding the ABS system requires a scan tool to cycle the pump and valves.
Sources for this issue (1)
Chevrolet Blazer · 1995–1999
The S-series Blazer's Kelsey-Hayes ABS system is prone to age-related faults: front wheel-speed sensors (integrated into the hub bearings) corrode and give erratic signals, the EBCM ground at the radiator support gets rusty/loose, and later Kelsey-Hayes 325 modules can fail internally. Symptoms include an ABS warning light, erratic wheel-speed codes, and in some cases the ABS pump running with the key off. Corroded grounds and connectors are a very common root cause on rust-belt trucks.
Common Symptoms
- ABS warning light on
- Erratic or dropped wheel-speed signal
- ABS activating at low speed / false activation
- ABS pump running with the ignition off
- Intermittent faults that worsen when wet
How to Fix
Scan for C-codes and inspect. Clean and tighten the EBCM ground straps at the radiator support first. Replace corroded front wheel-speed sensors / hub bearing assemblies as needed. If the EBCM itself is faulty, a repair-and-return board service is a cost-effective alternative to a new module.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- ABS Wheel Speed SensorCross-ref241-1060
Fitment confirmed against the ShowMeTheParts catalog for this vehicle's year and engine.
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Sources for this issue (1)
Chevrolet Tahoe · 2000–2006
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C0265 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does C0265 mean?
C0265 stands for "EBCM Motor Relay Circuit Low When On." C0265 is a manufacturer-specific chassis code (common on GM vehicles) indicating the Electronic Brake Control Module (EBCM) detected a fault in the internal motor relay circuit that powers the ABS pump motor, reading low voltage when the relay should be on. This relay must energize for the ABS, traction control, and stability systems to operate. When this fault is present, the module typically disables ABS and traction/stability control, illuminating the related warning lights. Normal braking still works, but the anti-lock and stability assist functions are offline.
What are the most common causes of C0265?
The most common causes of C0265 are: Cracked solder joints / internal failure in the EBCM, Failed ABS pump motor relay, Damaged or corroded EBCM wiring/connectors, Low system voltage or weak battery/charging fault, Poor ground at the EBCM, Failed ABS pump motor, Corrosion or water intrusion in the module connector. The specific cause varies by vehicle.
How much does it cost to fix C0265?
Repair costs for C0265 range from $100 to $1,200, depending on the vehicle and root cause.
Which vehicles are affected by C0265?
Au7o has documented C0265 across 4 vehicle models from 2 manufacturers: Cadillac, Chevrolet.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.