C0045 — Left Rear Wheel Speed Sensor Circuit Low
Seen on: Heavy Truck
Left Rear Wheel Speed Sensor Circuit Low. Common causes: WSS circuit fault left rear.
Your code rides along, so nearby mechanics see the fault before they quote you.
How serious is it?
Serious. Power derate likely — plan to stop soon.
Most likely causes
- WSS circuit fault left rear
- Tone ring damage
- harness chafe on axle
First moves (roadside)
- Inspect LR tone ring
- check axle-mounted harness routing for damage
FAQ
Left Rear Wheel Speed Sensor Circuit Low. Common causes: WSS circuit fault left rear.
Serious — Power derate likely — plan to stop soon.
The most common cause is: WSS circuit fault left rear. Other possibilities include Tone ring damage; harness chafe on axle.
Power derate likely — plan to stop soon. When in doubt, get a qualified mobile diesel tech on the truck before continuing.
Find a mechanic or related guides
General diagnostic guidance for diesel engines (Cummins, Detroit, PACCAR, Volvo, Mack and more). Not a substitute for a scan-tool diagnosis on your specific truck.