Is it safe to drive with this code?

You can typically drive the vehicle with normal braking function intact, but the anti-lock braking system may be disabled, which reduces braking effectiveness in emergency stops or slippery conditions. Avoid situations requiring sudden heavy braking and have the system inspected promptly – see our disclaimer regarding safety-critical faults.

This code may affect your MOT if the ABS warning light is illuminated at the time of test, as a permanently lit ABS lamp is an MOT failure point on vehicles fitted with ABS as standard – refer to our disclaimer for MOT-related guidance.

Roughly how much does it cost to fix?

Repair costs vary considerably depending on the root cause. Simple fixes such as cleaning corroded connectors or replacing a relay may be in the low two-figure range, whilst replacing wiring harnesses typically falls into the low three-figure bracket. If the ABS pump motor or complete hydraulic control unit requires replacement, costs can reach the mid to high three-figure range or even four-figure sums at main dealers, with labour charges adding substantially to parts costs.

Can I just clear the code and ignore it?

Clearing the code without addressing the underlying fault will typically result in the code returning, and driving without functional ABS increases stopping distances and raises the risk of loss of control during emergency braking, particularly in wet or icy conditions.

Professional mechanic working in workshop

← All fault codes | ABS / ESP

C0100

Chassis

ABS Pump Motor Circuit

The C0100 code typically indicates an electrical fault within the anti-lock braking system's pump motor circuit, which may affect the vehicle's ability to prevent wheel lock-up during heavy braking.

garage.co.uk

Need a garage?

Compare quotes from verified UK garages near you.

→

car.co.uk

Sell your car

We specialise in problem cars: warning lights, faults, high mileage. Fair instant offer.

→

trader.co.uk

List your car

Free private listing. Reach thousands of UK buyers, no fees.

→

ⓘ Information only. This page provides general educational information about fault code C0100. We do not assess the urgency or safety implications of any specific fault. That requires in-person diagnosis by a qualified mechanic. Full terms.

Recommended next steps

Whether a fault is urgent, drivable, or routine depends entirely on the cause on a specific vehicle, and that can only be determined by a qualified mechanic with diagnostic equipment. If a warning light is illuminated, the most reliable next step is professional diagnosis.

What does C0100 mean?

C0100 is a Chassis (ABS, traction control, steering) fault code. It indicates: ABS Pump Motor Circuit.

This is a standardised OBD-II code. The technical definition is the same regardless of the make or model of vehicle, although specific causes and symptoms can vary between vehicles.

About ABS / ESP codes

Codes in this category relate to the anti-lock braking system (ABS) and electronic stability control (ESP/ESC). These systems share wheel speed sensors, hydraulic modulators, and a common control module. Faults here usually disable ABS pulse braking and stability control assistance, but standard hydraulic brakes continue working normally.

C0100 is one of 429 codes in this category. Browse all ABS / ESP codes →

What we know about C0100 specifically

We record the SAE J2012 standardised definition and the system this code belongs to, but we have not yet published detailed driver-reported symptoms, common causes, or step-by-step diagnostic guidance for C0100.

Rather than invent that information by generating generic content from a template, we leave it out. For specific guidance, the most reliable sources are:

•your vehicle's own service manual or manufacturer-specific technical bulletins
•a qualified mechanic with a manufacturer-level diagnostic tool
•a marque specialist familiar with your make and model

Codes nearby

Codes adjacent to C0100 in the C-code series. Many fault codes appear together with their neighbours because they relate to the same circuit or component.

C0091 Traction Control Solenoid Valve Relay Circuit Range/Performance

C0092 Traction Control Solenoid Valve Relay Circuit Low

C0093 Traction Control Solenoid Valve Relay Circuit High

C0110 Pump Motor Circuit Malfunction

C0111 ABS Pump Motor Circuit Range/Performance

C0112 ABS Pump Motor Circuit Low

Other ABS / ESP codes

Other fault codes in the same system as C0100. The ones with detailed guides have plain-English explanations, symptoms, causes, and diagnostic steps.

B1106

Shift Lock Circuit Failure Detailed guide

C0021

Left Front Wheel Speed Sensor Circuit Detailed guide

C0035

Left Front Wheel Speed Sensor Circuit Range/Performance Detailed guide

C1000

Abnormality in Stoplight Switch Circuit Detailed guide

C1602

Manufacturer-Specific Chassis/ABS Fault Detailed guide

B1082

ORC-Occupant Restraint Control-Fps-Fire Protection Strategy-Activated

Spotted an issue or have something to add? Mechanics, technicians, and drivers who have first-hand experience with C0100 can submit a correction or expansion. We review every submission before publishing, mechanic submissions are prioritised.

Information only, not professional advice

The information on this page is provided for general guidance and educational purposes only. It is not a substitute for diagnosis or repair advice from a qualified mechanic. Always verify any fault before paying for repairs. carfaultcodes.co.uk accepts no liability for decisions made based on this information. Full terms →

✎

Help us improve the C0100 page

Spotted an error, missing detail, or have first-hand experience to add? Tell us, we review every submission.