Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer is having trouble understanding the speed of the left front wheel. It's like when you can't hear your friend clearly because there's static on the phone line.
The vehicle's computer has detected an issue with the correlation of signals from the left front wheel speed sensor.
The C0656 code indicates that the signal from the left front wheel speed sensor is not correlating properly with the expected values. This could be due to a faulty sensor, wiring issues, or a problem with the wheel speed sensor circuit.
• ABS warning light on
• Traction control light on
• Inconsistent speedometer readings
• Faulty left front wheel speed sensor
• Damaged wiring or connectors
• Corroded or dirty sensor connections
OBD-II: On-Board Diagnostics, a system that monitors vehicle performance.
ABS: Anti-lock Braking System, which prevents wheels from locking up during braking.
• Inspect the left front wheel speed sensor for damage.
• Check the wiring and connectors for any signs of wear or corrosion.
• Use a multimeter to test the sensor's electrical output.
• Replace the left front wheel speed sensor if faulty.
• Repair or replace damaged wiring or connectors.
• Clean corroded connections with electrical contact cleaner.
• OBD-II scanner
• Multimeter
• Electrical contact cleaner
$100 - $300
Moderate
• Chevrolet Silverado
• GMC Sierra
• Cadillac Escalade
• Regularly inspect wheel speed sensors and wiring.
• Keep sensor connections clean and free from corrosion.
• Avoid driving through deep water which can damage sensors.
Sensor Issue
• Have your vehicle inspected by a professional if you notice warning lights.
• Do not ignore the ABS warning light, as it can affect braking performance.
Check your vehicle's warranty; wheel speed sensors may be covered under powertrain or emissions warranty.
This code has been commonly reported in vehicles with high mileage or those frequently driven in harsh conditions.
Moderate – It is important to address this issue soon to ensure proper vehicle handling and safety.
Ignoring this code may lead to reduced braking performance and increased stopping distances.
• Vehicle must be driven at various speeds.
• Test on a flat, dry surface to ensure accurate readings.
The left front wheel speed sensor is located near the wheel hub assembly on the driver's side of the vehicle.
Q: Can I drive my car with a C0656 code?
A: It's not recommended to drive with this code active, as it can affect your vehicle's braking performance.
Q: How do I reset the ABS light after fixing the sensor?
A: Use an OBD-II scanner to clear the code, or disconnect the battery for a few minutes to reset the system.
Pro · Four-system diagnostics
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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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