Left Rear Wheel Speed Sensor Circuit
The ISUZU-C1006 (Isuzu) diesel fault code means: Left Rear Wheel Speed Sensor Circuit. This is a moderate severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- diy
- Estimated cost
- $180-$900
Down with a Isuzu fault on the road?
Get connected with a verified mobile diesel mechanic near you. Verified diesel & reefer techs, launching on the freight corridor.
Find a mobile mechanic →A $30 car code reader can't do diesel. The HD7000 reads full-system codes and does parked DPF regen, idle/speed-limit, and service resets from the cab — on everything from a 6.7 Cummins/Power Stroke/Duramax pickup to Class-8 trucks (Detroit, Paccar, CAT, Volvo, Mack, International).
Check Price on AmazonAffiliate link -- we earn a commission at no extra cost to you.
Full-system 6/9/16-pin diesel scan tool for Cummins, Paccar, CAT, Detroit and more — plug-and-play, no subscription. A cheaper way to read heavy-duty codes a basic OBD2 scanner skips entirely.
Check Price on AmazonAffiliate link -- we earn a commission at no extra cost to you.
Common Symptoms
- ABS warning lamp on
- Loss of ABS / stability assist
- Speedometer operates normally (unless driven off VSS)
- Possible traction control fault
- Limp-capable but not advisable for loaded deliveries
Probable Causes (Ranked by Likelihood)
- Wheel speed sensor tone-ring contaminated with brake dust / road debris Likely
- Broken or corroded WSS connector at knuckle / axle Likely
- Failed ABS module solenoid or relay (aging NPR / NQR) Possible
- Cracked tone ring on hub / axle from impact Possible
- Wiring chafed on inner fender liner Possible
Step-by-Step Diagnostic Procedure
Connect IDSS or generic ABS scan tool and confirm C1006 active with freeze-frame wheel speeds.
Clean the reluctor ring and WSS face with brake cleaner — contaminated signal is often mistaken for a failed sensor.
Back-probe the WSS connector with key-on; should read ~1-2 VAC square wave as wheel is spun by hand.
Measure resistance across sensor — spec varies (900-2000 ohms depending on model); open or out of range means replace.
If sensors are good, check ABS module supply voltage and ground integrity at frame mount.
Frequently Asked Questions
What does Isuzu code C1006 mean?
Isuzu diagnostic trouble code C1006 (Left Rear Wheel Speed Sensor Circuit) is a moderate-severity fault on Isuzu medium-duty diesel engines. It indicates a problem in the ABS / chassis that should be verified with a scan tool (Isuzu IDSS / Tech2 for Isuzu) before replacing any parts.
Can I drive my Isuzu truck with C1006?
Short runs may be possible but do not ignore — Isuzu medium-duty aftertreatment faults cascade quickly into 5-mph derate or no-restart. Schedule diagnosis immediately.
How much does it cost to fix Isuzu C1006?
Typical repair cost runs $180-$900. Sensor, wiring, and DEF-related repairs fall at the low end; DPF service, turbo, injector, and EGR cooler work fall at the high end and may require dealer-level programming.
C1006 on Other Platforms
The same code ID appears across other engines, vehicles, and equipment. Diagnostic flow varies by platform — see the matching breakdown: