C0045: Left rear wheel speed sensor circuit
Drive carefully. Get it checked within a week or two.
Can I drive with C0045?
Yes, but drive carefully and get it checked soon. Left rear speed signal missing; stability control and ABS are temporarily disabled.
What does C0045 mean?
C0045 stands for Left Rear Wheel Speed Sensor Circuit Malfunction.
Symptoms you may notice
- ABS, Traction Control, and StabiliTrak warning lights illuminated
- Anti-lock pulse disabled during wet or panic stops (normal brakes work)
- Cruise control disabled by brake safety interlock
How much does it cost to fix?
Repair costs for code C0045 depend on the specific underlying root cause, ranging from simple DIY checks to component replacement. The table below lists the most common causes and rough price ranges in USD:
- Defective left rear wheel speed sensor
- Broken wiring harness along rear axle
- Rust buildup on rear reluctor ring
- Faulty rear hub assembly
What to do next
- Inspect rear axle wiring for damage.
- Check rear wheel bearing for play or humming sound.
- Replace the rear ABS sensor.
Last updated: October 2026
Related codes
General guidance only, not a professional diagnosis. If the check-engine light is flashing, or the car is running rough, overheating or losing power, stop driving and get help.
About this code
Code C0045 indicates loss of speed data from the left rear wheel. Regular power brakes continue to stop the car normally. Replace the sensor to restore electronic safety systems.