What it means
This code identifies a fault associated with the traction disable indicator. The specific failure depends on the diagnostic subtype.
How it works
The traction disable indicator tells the driver when traction control has been turned off or is unavailable. The relevant module or instrument cluster checks the indicator's electrical path or commanded display state, and records this subfault when that indicator does not respond as expected; the exact test depends on the diagnostic subtype.
Common causes
Most likely first.
- Indicator lamp or LED fault
- Damaged wiring or connector
- Instrument cluster or control module fault
Symptoms
- Traction disable indicator may not operate as expected
How to diagnose it
- Read the diagnostic subtype and freeze-frame or module data first, because C0085 alone does not identify whether the lamp, its circuit, or the control module failed.
- With the ignition on, check whether the traction disable indicator illuminates during its normal self-check and when traction control is disabled.
- Inspect the indicator, cluster connectors, and related wiring for damage, loose terminals, corrosion, or poor grounds.
- Use a scan tool to command or observe the traction disable indicator if the vehicle supports it, and compare the requested state with the displayed state.
- Test the indicator circuit and cluster or module connections against the manufacturer's specification before replacing a component.
Common fixes
- Repair a loose, corroded, or damaged connector or wire in the indicator circuit.
- Restore a poor ground or power connection to the instrument cluster or related module.
- Replace a failed traction disable indicator lamp or LED if it is separately serviceable.
- Repair or replace the instrument cluster or control module if circuit tests isolate the fault there.
Can I keep driving?
The code alone does not show that traction control has failed, but the indicator may not reliably show when the system is disabled. Drive cautiously on slippery roads and verify traction control status through the vehicle's controls and other warnings.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.