Chassis, generic

C055C ABS Pump Motor Supply Voltage Circuit A Range/Performance

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Corroded or loose pump motor fuse, feed terminal or ground at the hydraulic unit
Weak battery or charging fault letting the supply collapse under motor load
Worn or sticking pump motor drawing excessive current
Faulty motor relay or driver stage inside the ABS module

Symptoms

  • ABS and stability control warning lamps on
  • No pump buzz during the start-up self-test
  • Normal braking remains, but without ABS regulation

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€30–1,500
Time0.5–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

abs pump motor supply aabs pump motor

Related codes

C052BC052FC055AC055BC0564

References: fordservicecontent.com, mitsubishitechinfo.com, mitsubishitechinfo.com, ti.com.