C0020 code meaning
ABS Pump Motor Circuit
What C0020 means
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.
C0020 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor1.5 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of C0020
- ABS warning lamp on
- ABS, traction and stability control disabled
- No pump noise during self-test
Common causes of C0020
- Most likelyPump motor seized or windings failed
- PossibleOpen or shorted motor supply or ground
- Less likelyBrake control module driver fault
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
ABS pump motorABS control modulePump motor relayPower supply wiring
What each part of C0020 means
| C | Chassis system: brakes, ABS, steering and suspension. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 20 | The exact fault in that area. |
What to do next
- Note C0020 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about C0020
What does C0020 mean?
C0020 means "ABS Pump Motor Circuit". Covers the electric pump (return) motor of the ABS hydraulic unit and its control circuit. It is a generic code, so it means the same on every make.
Is it safe to drive with C0020?
Drive gently and only to a workshop. With C0020 the car can go into limp mode (reduced power) to protect itself.
Will C0020 fail an emissions test?
C0020 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is C0020 to fix?
Difficulty: workshop only. A typical repair takes 1.5 to 4 hours of work. This is a job for a workshop.
Will C0020 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.