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

P054E Idle Control System Fuel Quantity Lower 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. 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.

Likely causes

Injectors delivering more than commanded (drift, coking, leaking needle)
Oil entering combustion (turbo seal, crankcase ventilation)
Rail pressure actually higher than measured
Wrong injector correction codes after replacement

Symptoms

  • Check engine light on
  • Rough or fluctuating idle
  • Blue or white smoke, knocking at idle

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 rail pressure sensorengine control module

Related codes

P054FP0506P0507P026CP0263P0087

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