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 having trouble getting the speed information from the right back wheel.
This code indicates a mechanical issue with the right rear wheel speed sensor, which is responsible for measuring the speed of the wheel and sending this information to the vehicle's computer systems.
The C051B code is triggered when the vehicle's control module detects a mechanical failure or fault in the right rear wheel speed sensor. This sensor plays a crucial role in systems like ABS (Anti-lock Braking System) and traction control by providing real-time wheel speed data.
• ABS warning light on
• Traction control light on
• Inconsistent speedometer readings
• Damaged wheel speed sensor
• Faulty wiring or connections
• Mechanical obstruction or debris
ABS: Anti-lock Braking System
OBD-II: On-Board Diagnostics, Second Generation
• Inspect the right rear wheel speed sensor for damage.
• Check wiring and connections for corrosion or disconnection.
• Look for any debris or obstructions around the sensor.
• Replace the damaged wheel speed sensor.
• Repair or replace faulty wiring or connectors.
• Clear any debris or obstructions from the sensor area.
• OBD-II scanner
• Multimeter
• Socket set
$100 - $300
Moderate
• Chevrolet Silverado
• GMC Sierra
• Cadillac Escalade
• Regularly inspect wheel sensors for damage.
• Keep sensor areas clean from debris.
• Check wiring connections periodically.
Sensor Issue
• Avoid driving in harsh conditions until repaired.
• Have the vehicle inspected by a professional mechanic.
• Monitor for any changes in vehicle performance.
Check with the vehicle manufacturer for specific warranty coverage on sensors.
Wheel speed sensor issues have been common in vehicles with advanced braking and traction systems since their introduction.
Moderate – While the vehicle may still be drivable, the ABS and traction control systems may not function properly.
Driving with a malfunctioning wheel speed sensor can lead to reduced braking performance and increased stopping distances.
• Vehicle parked on a level surface
• Ignition in the 'on' position without starting the engine
The right rear wheel speed sensor is located near the brake rotor on the rear passenger side wheel.
Q: Can I drive with a C051B code?
A: It's possible to drive, but it's not recommended as the ABS and traction control may not work properly.
Q: How do I reset the ABS light after fixing the sensor?
A: Use an OBD-II scanner to clear the code after repairs are completed.
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.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.