Trouble code
C0045
Left Rear Wheel Speed Sensor Circuit
What C0045 means
Invalid signal from the left rear wheel speed sensor.
Symptoms you may notice
- ABS light
- Traction control light
Common causes, cheapest first
- Failed sensor
- Rust buildup on the tone ring
- Damaged wiring
- Corroded connector
Before you buy anythingRear sensors take the most road salt. Clean the sensor tip and tone ring before replacing anything.
What to do next
- Confirm the code with your own scan tool, or have it read free at a chain parts store.
- Decode your VIN so you know your exact engine and build date.
- Work down the causes above from cheapest to most expensive.
- Search NHTSA for a recall or service bulletin covering this symptom on your vehicle.
- Read the brakes buying guide before ordering.
C0045 is a generic OBD-II code, standardized across every make and model sold in the US from 1996 onward. The meaning is the same on any vehicle; the specific part and its location are not.
Parts
Parts commonly needed for C0045
These go to Amazon. We earn a commission if you buy, at no extra cost to you — see our affiliate disclosure. Which one you actually need depends on diagnosis — read the note above first.
Confirm fitment against your VIN on the listing page before ordering. A part that matches your year and model can still be wrong for your build date or engine code.