Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means there is a problem with the sensor that tells the car how fast the left back wheel is spinning.
The left rear wheel speed sensor is not receiving the correct power supply or signal.
The C0038 code indicates an issue with the electrical circuit that supplies power to the left rear wheel speed sensor. This sensor is part of the anti-lock braking system (ABS) and traction control system, which helps the vehicle maintain stability and control.
• ABS warning light on
• Traction control light on
• Inoperative ABS or traction control
• Faulty left rear wheel speed sensor
• Damaged wiring or connectors
• Faulty ABS module
ABS: Anti-lock Braking System
OBD-II: On-Board Diagnostics, Second Generation
• Check for any other related codes.
• Inspect the wiring and connectors for damage.
• Test the left rear wheel speed sensor for proper operation.
• Replace the left rear wheel speed sensor if faulty.
• Repair or replace damaged wiring or connectors.
• Replace the ABS module if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$100 - $300
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regularly inspect wheel speed sensors.
• Keep the ABS system clean and free of debris.
• Ensure all electrical connections are secure.
Sensor Issue
• Do not ignore ABS warning lights.
• Have the issue diagnosed by a professional.
• Avoid driving in hazardous conditions until repaired.
Check with your vehicle manufacturer for specific warranty coverage on ABS components.
This code has been commonly associated with vehicles that have high mileage or have been exposed to harsh conditions.
Moderate – While the vehicle may still be drivable, the ABS and traction control systems may not function properly, affecting safety.
Driving with a malfunctioning ABS system could lead to reduced braking effectiveness and increased risk of accidents.
• Vehicle parked on a flat surface.
• Ignition in the 'ON' position without starting the engine.
The left rear wheel speed sensor is located near the brake assembly on the left rear wheel.
Q: Can I drive with a C0038 code?
A: While you can drive, it's not recommended as the ABS and traction control may not work properly.
Q: How do I clear a C0038 code?
A: After repairs, use an OBD-II scanner to clear the code, but ensure the issue is fixed first.
Pro · Four-system diagnostics
A handheld scanner aimed at engine, transmission, ABS, and airbag diagnostic work.
Chassis and ABS faults usually need a scanner that can read brake-system data directly.
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Universal · Torque wrench
Useful when reassembly torque matters for wheel, suspension, and under-hood fasteners.
Useful when wheel, hub, or suspension hardware needs correct reassembly torque.
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Universal · Drive-on ramps
Helpful for safer access underneath the vehicle during exhaust, EVAP, and underbody inspection work.
Helpful for safer access during underbody inspection work.
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