C0020: ABS Pump Motor Control
The ABS control unit has detected a fault in the control of the ABS pump motor.
High risk
Have it checked soon. ABS and stability control may be switched off.
Short answer · Can I keep driving with C0020?
Usually yes, with care. ABS and stability control may be switched off. Have it checked soon.
What does C0020 mean?
C0020 points to the circuit that drives the pump motor in the ABS hydraulic unit. A blown fuse, a poor ground, a corroded connector or a worn motor are typical causes.
What the car does when the code is set
The ABS and stability control warning lights come on, and the systems are switched off. Normal braking remains, but the wheels can lock under hard braking.
How the system works
The ABS hydraulic unit contains a pump motor and valves that control brake pressure at each wheel. The control module switches them through relays or drivers and monitors the circuits.
Common symptoms
Possible causes
Listed without ranking. The cause on your car depends on make, engine and mileage — see the maker notes below.
- Blown fuse or failed relayThe ABS pump and valves have high-current fuses.
- Poor ground at the ABS unitCorrosion at the ground point.
- Connector corrosionThe ABS unit sits in the engine bay and is exposed to moisture.
- Low battery voltageThe pump needs high current.
- Failed ABS hydraulic unit or control moduleInternal faults in the pump motor or valve relay.
How it is diagnosed
- Check the fuses for the ABS unitUse the fuse diagram; ABS pump fuses are often large cartridge fuses.
- Check battery voltageCharge or test the battery.
- Inspect connector and groundLook for corrosion and loose terminals.
- Have the unit testedA workshop can command the pump and valves with a scan tool.Brake hydraulic work must be done by trained technicians.
Questions about C0020
Do normal brakes still work?
Yes, the basic brakes work without the pump, but ABS and stability control may not.
Do the brakes still work?
Normal braking usually remains, but without ABS the wheels can lock under hard braking. If the brake warning light is also on, stop and have the car checked.