Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
The car's computer is confused about how the right front wheel is spinning. It thinks the wheel is going the wrong way, which doesn't make sense.
The vehicle's ABS system detected an implausible signal from the right front wheel speed sensor, indicating an incorrect direction of rotation.
The C1231 code is triggered when the ABS control module receives a signal from the right front wheel speed sensor that doesn't match the expected direction of wheel rotation. This could be due to a faulty sensor, wiring issues, or a problem with the wheel bearing or hub assembly.
• ABS warning light on
• Traction control light on
• Inconsistent speedometer readings
• Faulty right front wheel speed sensor
• Damaged or corroded wiring or connectors
• Faulty wheel bearing or hub assembly
ABS: Anti-lock Braking System
OBD-II: On-Board Diagnostics, Second Generation
• Check for any stored codes and clear them to see if they return.
• Inspect the right front wheel speed sensor and its wiring for damage.
• Test the sensor's output with a multimeter or oscilloscope.
• Replace the faulty wheel speed sensor.
• Repair or replace damaged wiring or connectors.
• Replace the wheel bearing or hub assembly if necessary.
• OBD-II scanner
• Multimeter
• Socket set
$150 - $400
Moderate
• Toyota Camry
• Ford F-150
• Chevrolet Silverado
• Regularly inspect wheel speed sensors and wiring.
• Keep wheel hubs clean and free from debris.
• Perform regular maintenance checks on the ABS system.
Sensor Issue
• Avoid driving at high speeds until the issue is resolved.
• Have a professional mechanic inspect the vehicle.
• Do not ignore the ABS warning light.
Check your vehicle's warranty for coverage on ABS components, as many manufacturers offer specific warranties for these parts.
This code has been reported in various models with ABS systems, particularly in vehicles with high mileage or those exposed to harsh conditions.
Moderate – While the vehicle is drivable, the ABS system may not function correctly, affecting braking performance.
Driving with a malfunctioning ABS system can increase stopping distances and reduce vehicle control during emergency braking.
• Vehicle must be on a flat surface.
• Wheels should be free to rotate for accurate sensor testing.
The right front wheel speed sensor is located near the wheel hub assembly on the passenger side of the vehicle.
Q: Can I drive with a C1231 code?
A: While you can drive with this code, it's not recommended as it affects the ABS system, which is crucial for safe braking.
Q: How do I reset the ABS light?
A: After fixing the issue, use an OBD-II scanner to clear the code. If the problem is resolved, the light should stay off.
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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