P054EIdle Control System Fuel Quantity Lower 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. P054E means the engine holds idle with much less fuel than expected – more energy arrives than commanded, for example from injectors delivering too much, oil entering combustion or wrong injector correction codes.
- What you may notice
- Check engine light on
- Rough or fluctuating idle
- Blue or white smoke, knocking at idle
- Likely causes
- LikelyInjectors delivering more than commanded (drift, coking, leaking needle)
- PossibleOil entering combustion (turbo seal, crankcase ventilation)
- PossibleRail pressure actually higher than measured
- PossibleWrong injector correction codes after replacement
- 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.