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 a signal from the right rear wheel speed sensor. This sensor helps the car know how fast each wheel is spinning.
The code C0669 indicates that there is a high voltage issue with the circuit connected to the right rear wheel speed sensor.
The right rear wheel speed sensor is part of the Anti-lock Braking System (ABS) and is responsible for sending wheel speed data to the vehicle's control module. A 'Circuit High' error suggests that the voltage in the sensor's circuit is higher than expected, which could be due to wiring issues, a faulty sensor, or a problem with the control module.
• ABS warning light illuminated
• Traction control system may be disabled
• Inconsistent braking performance
• Faulty right rear wheel speed sensor
• Damaged or corroded wiring or connectors
• Faulty ABS control module
ABS: Anti-lock Braking System
OBD-II: On-Board Diagnostics, Second Generation
• Inspect the right rear wheel speed sensor and its wiring for damage or corrosion.
• Use a multimeter to check the voltage and resistance of the sensor circuit.
• Check the ABS control module for faults.
• Replace the right rear wheel speed sensor if faulty.
• Repair or replace damaged wiring or connectors.
• Replace the ABS control module if necessary.
• Multimeter
• OBD-II scanner
• Basic hand tools
$150 - $400
Moderate
• Chevrolet Silverado
• GMC Sierra
• Cadillac Escalade
• Regularly inspect and clean wheel speed sensors.
• Ensure wiring and connectors are free from corrosion.
• Perform regular ABS system checks.
Sensor Issue
• Do not ignore the ABS warning light; have the system checked promptly.
• Avoid driving in conditions where traction is critical until the issue is resolved.
Check if the vehicle's warranty covers ABS components for potential coverage.
C0669 has been a common issue in vehicles with ABS systems, often related to sensor or wiring problems.
Moderate – While the vehicle can still be driven, the ABS system may not function properly, affecting braking performance.
Driving with a malfunctioning ABS system can be dangerous, especially in slippery conditions. It is advised to address this issue promptly.
• 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 wheel hub of the right rear wheel.
Q: Can I drive with a C0669 code?
A: While you can drive with this code, it is not recommended as the ABS system may not function properly.
Q: How does a wheel speed sensor affect ABS?
A: The wheel speed sensor provides data on wheel rotation speed, which the ABS uses to prevent wheel lock-up during braking.
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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