Powertrain, generic · Vehicle speed, idle control and auxiliary inputs

P054F Idle Control System Fuel Quantity Higher Than Expected

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

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.

Likely causes

Injectors delivering too little (coked, high return flow)
Rail pressure actually lower, fuel supply (filter, air)
Mechanical losses: compression, seizing accessories
EGR valve stuck open or intake blocked

Symptoms

  • Check engine light on
  • Idle fluctuating or dropping
  • Smoke, higher consumption

Repair estimate

DifficultyHardWorkshop job
Parts and labour€150–2,500
Time1–6 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

fuel injectorsfuel supplyengine control module

Related codes

P054EP0506P0507P026DP0263P0087

References: fordservicecontent.com, gsi.ext.gm.com, gsi.ext.gm.com, law.cornell.edu.