C052B code meaning
ABS Pump Motor Control Range/Performance
Chassis system Generic code C05xx codes Check engine light
What C052B means
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.
C052B at a glance
- Check engine lightYes, usually on
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyHard
- Typical labor0.5 to 4 hours
- Clears after repairAfter a drive cycle
Symptoms of C052B
- 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
Common causes of C052B
- Most likelyPump motor worn (brushes) or pump seized in the hydraulic unit
- PossibleMotor relay or switching stage in the ABS unit faulty
- PossibleMarginal supply or ground connection under motor load
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
ABS pump motor
What each part of C052B means
| C | Chassis system: brakes, ABS, steering and suspension. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 2B | The exact fault in that area. |
What to do next
- Note C052B and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about C052B
What does C052B mean?
C052B means "ABS Pump Motor Control Range/Performance". Range/performance fault of the ABS pump motor: the drive is commanded, but the motor or its relay does not behave as expected. It is a generic code, so it means the same on every make.
Is it safe to drive with C052B?
Drive gently and only to a workshop. With C052B the car can go into limp mode (reduced power) to protect itself.
Will C052B fail an emissions test?
C052B is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is C052B to fix?
Difficulty: hard. A typical repair takes 0.5 to 4 hours of work. This is a job for a workshop.
Will C052B clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.