Code Definition

C0020 — ABS anti lock pump motor control

System: Chassis  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About C0020

C0020 is a generic (obd-ii standard) chassis diagnostic trouble code. It belongs to the C-prefix family of codes, which covers chassis, braking, steering, suspension, or stability-control faults.

Scanning & clearing: Chassis (C) codes are stored in the ABS, traction control, or stability-control modules. An enhanced or OEM-level scan tool is usually required to read and clear them.

Because C0020 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

This DTC sets when the ABS control module detects an electrical fault in the pump motor control circuit. Specifically, the code is triggered if the module detects an open, short to ground, short to voltage, or a performance issue such as excessive current draw or no motor activation when it commands the pump motor on during a self test or ABS operation. The pump motor is essential for generating and maintaining hydraulic pressure in the brake system during ABS events. When this code is set ABS, traction, and stability control are usually disabled and their warning lights come on, though normal...

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