Is it safe to drive with this code?

Basic braking function commonly remains intact, but the loss of ABS at the left rear wheel increases the risk of wheel lock-up during hard braking or on wet surfaces. Drive cautiously and arrange inspection promptly—see our disclaimer for further guidance.

It may affect your MOT result if the ABS warning lamp is illuminated at the time of the test, though the outcome depends on the tester's assessment—see our MOT disclaimer for details.

Roughly how much does it cost to fix?

Costs vary widely depending on the root cause. Simple wiring repairs may fall into the low two-figure range, whilst solenoid valve replacement typically costs low to mid three-figure sums. Complete ABS module replacement can reach high three-figure or even four-figure territory at main dealers, though independent specialists often charge less.

Can a faulty relay cause this code?

Yes, the relay that supplies voltage to the ABS solenoid valves can trigger this code if it fails or develops a poor connection, though wiring faults and solenoid valve issues are often more common causes.

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← All fault codes | ABS / ESP

C0143

Chassis

Left Rear ABS Solenoid Valve Relay Circuit

The ABS control module has detected an electrical fault in the circuit that powers or controls the left rear wheel's solenoid valve relay, which may affect anti-lock braking function.

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ⓘ Information only. This page provides general educational information about fault code C0143. 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 C0143 mean?

C0143 is a Chassis (ABS, traction control, steering) fault code. It indicates: Left Rear ABS Solenoid Valve Relay 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.

C0143 is one of 429 codes in this category. Browse all ABS / ESP codes →

What we know about C0143 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 C0143.

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 C0143 in the C-code series. Many fault codes appear together with their neighbours because they relate to the same circuit or component.

C0134 ABS Pressure Sensor Circuit High

C0141 Left Front ABS Solenoid Valve Relay Circuit

C0142 Right Front ABS Solenoid Valve Relay Circuit

C0144 Right Rear ABS Solenoid Valve Relay Circuit

C0145 Left Front ABS Solenoid Valve Relay Circuit Stuck Closed

C0146 Right Front ABS Solenoid Valve Relay Circuit Stuck Closed

Other ABS / ESP codes

Other fault codes in the same system as C0143. 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 C0143 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 →

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