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 thinks the wrong part is used for the left rear wheel sensor. It's like trying to use a puzzle piece that doesn't fit.
The vehicle's control module detects that the left rear wheel speed sensor does not match the expected specifications, possibly due to an incorrect part being installed.
The C0665 code indicates that the control module has identified an issue with the left rear wheel speed sensor, specifically that it may not be the correct component for the vehicle. This can affect the vehicle's stability control and anti-lock braking systems.
• ABS warning light on
• Traction control system warning light on
• Inconsistent speedometer readings
• Incorrect wheel speed sensor installed
• Faulty wheel speed sensor
• Incorrect sensor calibration
OBD-II: On-Board Diagnostics, a standardized system for vehicle diagnostics.
ABS: Anti-lock Braking System, prevents the wheels from locking up during braking.
• Verify the part number of the installed wheel speed sensor.
• Check for wiring issues or connection problems.
• Test the sensor signal with a diagnostic tool.
• Replace the wheel speed sensor with the correct part.
• Repair or replace damaged wiring or connectors.
• Recalibrate the sensor if necessary.
• OBD-II scanner
• Multimeter
• Wrench set
$100 - $300
Moderate
• Chevrolet Silverado
• GMC Sierra
• Cadillac Escalade
• Ensure correct part numbers when replacing sensors.
• Regularly inspect wiring and connectors.
• Use OEM parts for replacements.
Sensor Issue
• Have a professional mechanic inspect the sensor.
• Avoid driving at high speeds until the issue is resolved.
Check with the vehicle manufacturer for warranty coverage on sensor replacements.
This code has been commonly reported in vehicles with aftermarket sensor replacements.
Moderate – It should be addressed soon to ensure proper vehicle safety systems function.
Ignoring this issue may affect vehicle safety systems like ABS and traction control.
• Vehicle on a flat surface
• Ignition in the ON position
The left rear wheel speed sensor is located near the left rear wheel hub assembly.
Q: Can I drive with a C0665 code?
A: It's not recommended as it may affect your vehicle's safety systems.
Q: How do I know if the sensor is wrong?
A: Check the part number and compare it with the manufacturer's specifications.
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.