C055CABS Pump Motor Supply Voltage Circuit A Range/Performance
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- The return pump motor of the ABS/ESC hydraulic unit has its own power feed, usually a fused line from the battery switched through a relay or a transistor stage in the module. C055C means this feed is present but its voltage does not behave as expected while the motor is off or running – sagging under load, slow to rise or drifting – as opposed to the hard open or short codes C052F, C055A and C055B. No maker publishes a C055C threshold. Ford checks the same motor supply under C052B: below 6 V with the pump off or 7.3 V with it on for 1.8 s. Mitsubishi files a motor or motor-relay fault (C1051-1C, up to 12 s) without an SAE code. GM used C055C in older power steering modules for an unrelated fault. With the pump unusable, ABS and stability control switch off.
- What you may notice
- ABS and stability control warning lamps on
- No pump buzz during the start-up self-test
- Normal braking remains, but without ABS regulation
- Likely causes
- LikelyCorroded or loose pump motor fuse, feed terminal or ground at the hydraulic unit
- PossibleWeak battery or charging fault letting the supply collapse under motor load
- PossibleWorn or sticking pump motor drawing excessive current
- RareFaulty motor relay or driver stage inside the ABS module
- Repair
- Medium · Usually a job for a workshop.Typical cost: €30 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.