OBD-II Code · Chassis
C0265
EBCM Relay Circuit
Severity
medium
Worth booking. It costs fuel, emissions or comfort until it is fixed.
Can you drive it
Only if running normally
A short trip to a shop may be reasonable if the light is steady and the car runs normally. Stop safely for a flashing light, severe shaking, overheating, loss of power, or another urgent warning. The code alone cannot confirm safety.
Indicative cost (USD)
$200–$800
Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
Electronic brake control module relay fault.
How a shop works this
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed.
Note every code that is set, not just this one.
Codes that appear together usually narrow the cause faster than any one of them read alone.
Read the freeze frame — the conditions the fault was recorded under.
Cold or warm, idle or load, road speed and engine speed. A fault that only appears cold is a different fault from one that only appears under load, even with the same code on the scanner.
Confirm the fault is current rather than history.
Clear the code and see whether it returns under those same conditions. A code that does not come back may have been logged during a repair, a flat battery, or a bad connection that has since been disturbed.
Then work the likely-causes list in the order shown.
That order is what a shop checks first for this code — wiring and connections before the component they run to, because a connector costs nothing to inspect and is a common answer.
If the code comes back after a repair, the underlying fault is still there. That is the point to bring in a scanner with live data and freeze-frame, or a shop that has one.
Common symptoms
- ABS light
- Traction control off
Likely causes
- Failed relayMost common
- Wiring
- EBCM internal
Read the full diagnostic procedureC0265 is the EBCM relay circuit code, indicating the main relay that powers the ABS solenoids and pump-motor control logic is not behaving as expecte…
C0265 is the EBCM relay circuit code, indicating the main relay that powers the ABS solenoids and pump-motor control logic is not behaving as expected — either the EBCM cannot energize the relay, the relay coil is open, or the contacts are stuck/welded.
Cheapest first
- clear it, see if it returns immediately at key-on (hard fault) or only after a few drive cycles (intermittent contact wear).
- Pull the ABS relay from the underhood fuse box and bench-test it with a 12V battery and a test light — coil should click crisply and contacts should pass continuity only when energized; swap it with an identical-pinout relay from the horn or fuel-pump circuit for a $0 confirmation.
- Check the relay socket terminals for spread/burnt pins and the EBCM control wire (usually a low-side driver from the module) for the expected pull-to-ground when commanded.
- Live-data check: most scan tools can command the ABS relay on/off — you should hear an audible click and see the ABS solenoid feed circuit voltage rise from 0V to battery voltage.
- The expensive misdiagnosis pattern is the C0110/C0265 paired code on GM Kelsey-Hayes 325 systems, where techs replace the relay (correct) but never address the cold-solder joint inside the EBCM that re-sets the code in 200 miles, then condemn the whole module unnecessarily.
Vehicle-specific patterns1999-2007 GM Silverado/Sierra/Tahoe/Suburban — internal EBCM solder joints crack from underhood heat cycling, the rebuilders specifically target this.
- 1999-2007GM Silverado/Sierra/Tahoe/Suburban — internal EBCM solder joints crack from underhood heat cycling, the rebuilders specifically target this.
- 2003-2008Chevy TrailBlazer/GMC Envoy — relay socket terminals spread and lose contact pressure.
- 2005-2009Pontiac Grand Prix — ABS relay coil opens, $12 part.
- 2001-2006Chevy Silverado HD 2500/3500 — combined C0265+C0110+C0161 pattern is the Kelsey-Hayes failure signature; rebuild service is the cost-effective fix.
Estimated repair$12 to $1,400.
Look up another code
C0265 — frequently asked
What does a C0265 code mean?
Electronic brake control module relay fault.
What causes a C0265 code?
Common causes: Failed relay; Wiring; EBCM internal.
What are the symptoms of a C0265 code?
Typical symptoms: ABS light; Traction control off.
Is it safe to drive with a C0265 code?
Only if running normally. A short trip to a shop may be reasonable if the light is steady and the car runs normally. Stop safely for a flashing light, severe shaking, overheating, loss of power, or another urgent warning. The code alone cannot confirm safety. Estimated repair: $200-$800.
How do I diagnose a C0265 code?
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed. 1. Note every code that is set, not just this one. 2. Read the freeze frame — the conditions the fault was recorded under. 3. Confirm the fault is current rather than history. 4. Then work the likely-causes list in the order shown.
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