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

P05FC Cold Start Fuel Pressure Performance Bank 2

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

During a cold start, direct injection petrol engines usually raise rail pressure for finer atomisation with multiple injections while the catalyst heats up. P05FC monitors whether the actual rail pressure of bank 2 stays within the target window during this phase – only engines with separate rails and pressure sensors per bank (V or boxer engines with two high-pressure circuits) can set it. CARB lists fuel pressure as a cold start component that must respond measurably beyond what would happen without the strategy. No manufacturer document available to us uses P05FC; Ford checks the single-rail counterpart P053F and flags a fault when the share of cold start time inside the pressure window is 0.70 or less, and Kia replaced the engine module of the 2018 Stinger 2.0T for P053F with stumbling during warm-up. GM uses P2C1E–P2C20 instead.

Likely causes

High-pressure pump or volume control valve of bank 2 weak or sticking
Low supply pressure (low-pressure pump, filter)
Rail pressure sensor of bank 2 inaccurate
Engine module software
Leaking injector or pressure relief on bank 2

Symptoms

  • Check engine light on
  • Stumbling, hesitation or rough idle during warm-up
  • Poorer cold start
  • Usually normal once warm

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–1,200
Time1–4 h

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

Parts involved

high pressure fuel pumpfuel rail pressure sensorengine control module

Related codes

P053FP2C1EP2C1FP2C20P0087P0088

References: law.cornell.edu, fordservicecontent.com, static.nhtsa.gov.