C0046 — Left Rear Wheel Speed Sensor Performance
Seen on: Heavy Truck
Left Rear Wheel Speed Sensor Performance. Common causes: LR WSS signal intermittent.
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
- LR WSS signal intermittent
- Dirty tone ring
- worn wheel bearing
First moves (roadside)
- Clean tone ring
- check bearing end play
- replace WSS if needed
FAQ
Left Rear Wheel Speed Sensor Performance. Common causes: LR WSS signal intermittent.
Serious — Power derate likely — plan to stop soon.
The most common cause is: LR WSS signal intermittent. Other possibilities include Dirty tone ring; worn wheel bearing.
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.