C0225ABS Valve Relay Circuit
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- C0225 is missing from the accessible J2012 lists. GM does use the number: its terminal-test bulletin PIP5094 for 2014 and older cars and light trucks lists it among the chassis codes, and AA1Car's table of GM ABS codes gives it as Left Front Wheel Speed Sensor Circuit Open, not as a valve relay fault. No maker on record documents a valve relay meaning. For the relay named in the title, a Hella/Lucas patent explains the job: one relay contact supplies all ABS valves, and the module checks both coil current and switched voltage, opening the relay on a fault so the valves return to rest. On a GM vehicle with C0225, the left front sensor circuit deserves the first look; HELLA notes that only passive sensors can be checked by resistance.
- What you may notice
- ABS warning lamp on, ABS disabled
- Traction control or speedometer function affected on some vehicles
- Likely causes
- LikelyOn GM vehicles open left front wheel speed sensor or its wiring
- PossibleBurnt or sticking valve relay contact
- PossibleBlown fuse or poor ground in the relay circuit
- Repair
- Medium · Often possible to do yourself.Typical cost: €30 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.