C0034 — Left Front Wheel Speed Sensor Performance
Seen on: Heavy Truck
Left Front Wheel Speed Sensor Performance. Common causes: WSS signal erratic or 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
- WSS signal erratic or intermittent
- Tone ring buildup
- sensor mounting loose
- bearing play
First moves (roadside)
- Clean tone ring
- check sensor mounting torque
- check bearing play
FAQ
Left Front Wheel Speed Sensor Performance. Common causes: WSS signal erratic or intermittent.
Serious — Power derate likely — plan to stop soon.
The most common cause is: WSS signal erratic or intermittent. Other possibilities include Tone ring buildup; sensor mounting loose; bearing play.
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.