OBD2 code C0021: ABS Pump Motor Circuit Range/Performance
The pump motor responds, but its current draw or run time is outside the expected range.
Detected Root Component
Chassis Component
Observed Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Possible Causes
- Pump worn, low delivery
- Hydraulic block contaminated with brake fluid debris
- Sensor element aged beyond calibration window
Tools Required
Interactive Diagnostic
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Parts likely to be the cause (Capteur ABS)
Capteur ABS
Photo d'illustration : Capteur ABS
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Frequently asked questions about code C0021
What does code C0021 mean? ▾
OBD2 code C0021: ABS Pump Motor Circuit Range/Performance. The pump motor responds, but its current draw or run time is outside the expected range.
What are the symptoms of code C0021? ▾
Code C0021 may cause: ABS warning light on, ESC/stability control deactivated, Possible reduced brake assist, Speedometer may behave erratically. The intensity of these symptoms varies depending on the vehicle and driving conditions.
What causes code C0021? ▾
The most common causes of code C0021 are: Pump worn, low delivery, Hydraulic block contaminated with brake fluid debris, Sensor element aged beyond calibration window. A proper OBD2 diagnostic will pinpoint the exact cause.
Is it serious to drive with code C0021? ▾
Yes, code C0021 is critical (Critical). Avoid driving and consult a professional promptly to prevent major damage.
How do I fix code C0021? ▾
Start by reading the code with an OBD2 scanner, then follow the interactive decision tree on this page. Priority causes to check: Pump worn, low delivery, Hydraulic block contaminated with brake fluid debris, Sensor element aged beyond calibration window. Difficulty: Medium · Estimated time: 30-60min.