P06DBEngine Oil Pressure Control Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Can trigger limp mode
- How the car detects it
- A switchable or variable oil pump saves fuel by lowering its output at part load; a solenoid valve sets the stage. GM and Ford design it so the pump runs at full output, i.e. high pressure, when the valve is unpowered – the safe default – and at the low stage when powered. P06DB means the control wire behind the valve is shorted to ground. With a low-side driver the valve is then powered all the time, so the pump stays at the low stage even at high load and speed. That endangers the engine, so GM flags a short below 0.5 Ω after just one trip, unlike open circuit and short to positive. GM checks the low-side driver at 11 V or more relay voltage over 40 of 50 samples (100 ms); Ford's smart driver reports output faults after 5 s with the battery at 11 V or more. A short to positive is P06DC, a pump stuck at low pressure without a circuit fault P06DE.
- What you may notice
- Check engine light at once (GM after one trip)
- Low oil pressure at high engine speed, possibly oil pressure warning
- Possibly reduced power
- Likely causes
- LikelyControl wire chafing against ground (engine block, oil pan)
- PossibleControl valve shorted internally
- PossibleOil or moisture in the connector
- RareEngine module driver stage
- Repair
- Medium · Usually a job for a workshop.Typical cost: €60 – €450
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.