OBD-II code · Chassis
C0021 ABS Pump Motor Circuit Range/Performance
The pump motor responds, but its current draw or run time is outside the expected range. The control module suspects mechanical wear or hydraulic blockage.
Is it safe to drive with C0021?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyPump worn, low delivery
- PossibleHydraulic block contaminated with brake fluid debris
- Less likelySensor element aged beyond calibration window
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 2–5 h
- Emissions test
- Usually unaffected
- Parts involved
- ABS Pump Motor, ABS Hydraulic Block, ABS Control Module
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.