Trouble-code guideIntermediateEvidence-led
A chassis controller detected a left-front wheel-speed circuit or signal fault; code wording varies by manufacturer.
Why this matters
A trouble code reports a monitored result. It narrows the system and test conditions, but it rarely names the failed part by itself.
Evidence to capture first
- Exact module definition and subcode
- All wheel-speed graphs during a slow straight drive
- Sensor supply or active-sensor current, connector condition, tone ring, bearing play, and harness movement
A disciplined path
- Confirm manufacturer-specific code meaning
- Compare all four signals at low speed
- Inspect mechanical target and bearing condition before electrical replacement
- Reproduce the signal dropout while safely moving the harness or rotating the wheel
Decision point
The repair is supported when the failed circuit, mechanical condition, or monitored response is measured and the original monitor can run without the fault returning.
Source desk
Use current model-specific service information for specifications, connector locations, disabling procedures, and tightening values. The following public resources support the broader safety or system context used in this guide.