C0020ABS Pump Motor Circuit
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- Covers the electric pump (return) motor of the ABS hydraulic unit and its control circuit. The motor drives the piston pump that returns brake fluid from the low-pressure accumulators and builds pressure for ABS, traction and stability interventions. The control module commands the motor and monitors the drive circuit and motor-run feedback; it sets the code for an open or shorted motor circuit, a seized motor or a run signal that does not match the command. RAM assigns code C0020-01 to a general electrical failure of the ABS pump-motor control on its 2500 and 3500 trucks. A fault disables ABS and the stability functions; the ABS lamp illuminates and base braking remains.
- What you may notice
- ABS warning lamp on
- ABS, traction and stability control disabled
- No pump noise during self-test
- Likely causes
- LikelyPump motor seized or windings failed
- PossibleOpen or shorted motor supply or ground
- RareBrake control module driver fault
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €400 – €1,900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.