Corroded, loose, or damaged ABS pump motor power feed wire or connector; Blown or intermittent high-current fuse for the ABS pump motor circuit; Failed ABS pump motor relay (if equipped) or faulty relay control circuit; High resistance in the ground circuit for the pump motor; Internal fault in the ABS pump motor or control module; Low battery voltage or poor charging system output affecting supply voltage; Water intrusion or debris in the pump motor connector causing voltage drop

DTC codes / C05xx · Brakes, steering and suspension / C055C

C055CABS Pump Motor Supply Voltage Circuit A Range/Performance

Q: What does code C055C mean?

ABS Pump Motor Supply Voltage Circuit A Range/Performance. This code means the anti-lock braking system (ABS) control module has detected an out-of-range or performance problem in the voltage supply circuit for the ABS pump motor, typically on the main feed side. The module monitors the voltage at the pump motor supply circuit and sets the code when the signal falls outside the expected range or does not behave as commanded.

This code means the anti-lock braking system (ABS) control module has detected an out-of-range or performance problem in the voltage supply circuit for the ABS pump motor, typically on the main feed side. The module monitors the voltage at the pump motor supply circuit and sets the code when the signal falls outside the expected range or does not behave as commanded.

SystemChassis

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaBrakes, steering and suspension

Symptoms you may notice

ABS warning light illuminated on the dashboard
Traction control and stability control warning lights may also be on
ABS disabled, with normal hydraulic braking still available
Pump motor may run continuously or not at all during a self-test
Often no symptoms besides the warning light
Intermittent warning light that comes and goes with vibration or temperature changes

Common causes, most likely first

Corroded, loose, or damaged ABS pump motor power feed wire or connector
Blown or intermittent high-current fuse for the ABS pump motor circuit
Failed ABS pump motor relay (if equipped) or faulty relay control circuit
High resistance in the ground circuit for the pump motor
Internal fault in the ABS pump motor or control module
Low battery voltage or poor charging system output affecting supply voltage
Water intrusion or debris in the pump motor connector causing voltage drop

How to diagnose and fix it

Scan all modules and record freeze-frame data to confirm the code is current and not history
Inspect the ABS pump motor fuse, relay, and connectors for corrosion, tightness, and water intrusion
Measure battery voltage and charging system output to rule out low supply voltage
Perform a voltage drop test on the pump motor power feed and ground circuits under load
Command the pump motor with a scan tool and monitor supply voltage and current draw
If voltage drop is excessive, repair or replace the affected wiring, terminals, or relay
If the circuit tests good but the fault persists, replace the ABS pump motor or control module as required

What the pump motor circuit hides

A pump motor that runs during the self-test but draws excessive current can set this code without any obvious wiring fault, so current ramping with a scope is often more revealing than a simple voltage check.
Corrosion inside the pump motor connector is a common cause that looks fine from the outside, so always back-probe and wiggle-test the harness while monitoring voltage.
This code does not always mean the pump motor is bad; a weak battery or failing alternator can drop supply voltage below the threshold during ABS self-test and trigger the code.
Some vehicles set this code when the ABS module loses its ground reference through a shared ground point that also serves other chassis electronics, so check all grounds on that circuit.
After replacing the pump motor or module, some vehicles require a scan-tool bleed procedure or calibration before the ABS light will clear and stay off.

Can I keep driving with C055C?

The vehicle remains safe to drive under normal braking because the base hydraulic system is unaffected, but ABS and stability control are disabled, so avoid panic stops, slippery surfaces, and towing until repaired.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.