Chassis, generic

C055A ABS Pump Motor Supply Voltage Circuit A High

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

Supply voltage A of the ABS pump motor is above its upper limit. The motor draws heavy current, so overvoltage stresses motor, relay or semiconductor switch; typical causes are a faulty alternator regulator, a jump-start or charger at too high a voltage, or a measuring fault in the module. No maker documents C055A publicly. Mitsubishi shows comparable limits on the 2023 Outlander PHEV: the motor feed is specified at 10–16 V, and the brake unit stores C1056-17 (generic C0565, ABS module system voltage high) once its ignition supply reaches at least 16 V, with a detection delay of at most 1 s, suspending ABS, ASC and related functions. Circuit B has its own codes (C05A5 ff.). Measure the charging voltage first.

Likely causes

Alternator regulator or DC/DC converter delivering too high a voltage
Jump-start or battery charger with excessive voltage
Voltage measurement fault in the ABS control unit

Symptoms

  • ABS and ESC warning lamps on
  • Other overvoltage warnings or flickering lights at the same time

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€30–700
Time0.3–2.5 h

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

Parts involved

abs pump motor supply a

Related codes

C055BC055CC0565C052FC05A6

References: mitsubishitechinfo.com, mitsubishitechinfo.com, mitsubishitechinfo.com, law.cornell.edu.