C0265
EBCM Relay Circuit
The Electronic Brake Control Module has detected a fault in its main supply relay circuit. Without proper relay supply the EBCM cannot operate the hydraulic unit and ABS as well as stability control are disabled.
- Check engine light: Not always
- Emissions related: No
- Repair difficulty: hard
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Common causes
Ordered by how often each turns out to be the cause.
- EBCM relay failedCommon
- Internal EBCM fault (relay integrated)Possible
- Power supply wiring or fuse faultLess likely
Parts involved
- Ebcm Relay
- Ebcm Module
- Power Supply Wiring
C0265 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.