Chassis, generic

C052B ABS Pump Motor Control Range/Performance

Check engine lightOn
EmissionsNot relevant
Drive cycleRequired
Limp modePossible

Range/performance fault of the ABS pump motor: the drive is commanded, but the motor or its relay does not behave as expected. On the 2023 Mitsubishi Outlander PHEV the brake unit maps C1051-04 (and C1051-49, added by bulletin TSB-23-35-002) to C052B; it is checked with normal supply voltage, set within 12 s; after a single trip the ASC, ABS and brake warnings plus the check-engine lamp come on. ESC, traction control, ABS, EBD, brake assist and regenerative braking are suspended. An AlliedSignal patent, now held by Bosch, shows one test: a healthy motor coasts after switch-off and its voltage decays slowly, so a decay faster than about 134 V/s marks a motor that did not turn. Usually motor or pump in the hydraulic unit are worn or seized; basic braking stays.

Likely causes

Pump motor worn (brushes) or pump seized in the hydraulic unit
Motor relay or switching stage in the ABS unit faulty
Marginal supply or ground connection under motor load

Symptoms

  • ABS, ESC and brake warning lamps on
  • ABS and stability control unavailable, normal braking remains
  • No pump noise during the self-test after starting off

Repair estimate

DifficultyHardWorkshop job
Parts and labour€150–2,000
Time0.5–4 h

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

Parts involved

abs pump motor

Related codes

C052CC052DC052EC0020

References: mitsubishitechinfo.com, mitsubishitechinfo.com, static.nhtsa.gov, patents.google.com.