P06F4Stop-Start Mode Lamp Control Circuit
- Generic OBD-II code · Powertrain
- How the car detects it
- When the engine module switches a lamp through its own wire, it checks the output driver electrically like other lamp outputs: with the lamp off the line must carry supply voltage, with it on nearly 0 V – GM's MIL driver, for example, flags an open circuit at 200 kΩ or more. It cannot see whether the bulb lights, and on cars that send the lamp command over CAN such faults appear as U codes. P06F4 concerns the indicator showing that stop-start is active or disabled; the code reports a fault in its control circuit. No manufacturer document available to us uses it; the description follows CARB's output check and other lamp circuits. Only the display is affected – the stop-start function itself has its own codes (P06E9, P06EF).
- What you may notice
- Stop-start indicator not working or permanently lit
- Usually no check engine light
- Likely causes
- LikelyWire or connector to the indicator open or shorted
- PossibleIndicator or instrument cluster faulty
- RareEngine module driver stage
- Repair
- Easy · Often possible to do yourself.Typical cost: €30 – €250
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.