Code result
C0021
ABS Pump Motor Circuit Range/Performance
Moderate severity
What it means
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?
Use caution
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.
Most likely causes
Pump worn, low delivery
highOne of the most commonly reported causes for this code — check this first.
Hydraulic block contaminated with brake fluid debris
mediumA plausible cause — test and verify before replacing parts.
Sensor element aged beyond calibration window
lowLess common, but worth ruling out after the more likely causes.
Related help
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