C0034 — Left Front Wheel Speed Sensor Performance

What it means: Left Front Wheel Speed Sensor Performance.

How serious / can you keep driving: Serious. Power derate likely — plan to stop soon.

Check first: Clean tone ring

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Listed providers nearest Macon, GA

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Henry's Truck Repair☎ Call
0.0 mi away — based in Macon, GA · (478) 538-3245
Top Notch Truck and Trailer Repair LLC☎ Call
0.0 mi away — based in Macon, GA · (478) 216-8330
Central breakdown heavy duty towing & repair☎ Call
0.0 mi away — based in Macon, GA · (706) 536-3376

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SeriousBrakes, ABS & StabilityPower derate likely — plan to stop soon

Seen on: Heavy Truck

What C0034 means

Left Front Wheel Speed Sensor Performance. Common causes: WSS signal erratic or intermittent.

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

What does C0034 mean?

Left Front Wheel Speed Sensor Performance. Common causes: WSS signal erratic or intermittent.

How serious is C0034?

Serious — Power derate likely — plan to stop soon.

What's the most likely cause of C0034?

The most common cause is: WSS signal erratic or intermittent. Other possibilities include Tone ring buildup; sensor mounting loose; bearing play.

Can I keep driving with C0034?

Power derate likely — plan to stop soon. When in doubt, get a qualified mobile diesel tech on the truck before continuing.

Throwing this code right now?

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Related codes

Codes that commonly appear alongside C0034, or share the same subsystem.

Same symptom: ABS or stability lamp

Other codes behind a lit ABS or stability lamp — the ones that turn an inspection into an out-of-service order.

Right rear wheel speed erratic (SPN 792 FMI 2) · Brakes, ABS & Stability
Right rear wheel speed abnormal (SPN 792 FMI 8) · Brakes, ABS & Stability
Left tag/pusher wheel speed erratic (SPN 793 FMI 2) · Brakes, ABS & Stability
Right tag/pusher wheel speed erratic (SPN 794 FMI 2) · Brakes, ABS & Stability
ATC (automatic traction control) diff brake — not responding (SPN 974 FMI 7) · Brakes, ABS & Stability
Left Front Wheel Speed Sensor Circuit Low (C0031) · Brakes, ABS & Stability

All Brakes, ABS & Stability codes

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