P054FIdle Control System Fuel Quantity Higher Than Expected
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- Diesel only. At controlled idle the module compares the fuel quantity the idle governor needs for target speed with a model value; CARB sets the limit from 2013 at ±50 % of what a sound engine needs. Ford's diesel sets the codes beyond ±50 % for 5 s at standstill with warm engine and no filter regeneration; GM compares with 0.5 times a minimum map or 1.5 times a maximum map, 200 of 255 samples, type B. P054F means the governor needs much more fuel than expected – the commanded quantity does not arrive or the engine has extra losses: clogged injectors, low compression, an EGR valve stuck open or additional load from accessories.
- What you may notice
- Check engine light on
- Idle fluctuating or dropping
- Smoke, higher consumption
- Likely causes
- LikelyInjectors delivering too little (coked, high return flow)
- PossibleRail pressure actually lower, fuel supply (filter, air)
- PossibleMechanical losses: compression, seizing accessories
- RareEGR valve stuck open or intake blocked
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €150 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.