Powertrain, generic (extended)

P2A3E Alternative Fuel Delivery Error

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P2A3E is the alternative fuel version of P0148: the system cannot supply the gas or propane quantity the engine asks for. Ford had already defined its own code P1048 with this wording, listed with a lamp in the 2014 Boss 302S OBD table. Roush CleanTech's liquid propane system on Ford trucks shows how a delivery error is judged, there still under P0148: the pump voltage has climbed to its adaptive maximum while fuel trims run lean. Roush names a clogged filter, a tripped excess-flow valve, a closed tank or rail supply solenoid and a partly closed manual valve, and calls that code non-MIL. GM's 2015 bi-fuel Impala switches to the other fuel when one supply fails. No public source uses P2A3E itself; drivers mainly notice hesitation and a change to petrol.

Likely causes

Gas or propane filter heavily restricted
Tank solenoid, rail solenoid or manual valve not fully open
Excess-flow valve on the tank tripped
Weak propane pump or pressure regulator not holding pressure
Tank pressure too low because the tank is nearly empty

Symptoms

  • Hesitation or stalling on gas
  • Automatic switch to petrol
  • Lean fuel trim codes stored as well
  • Warning lamp depending on manufacturer

Repair estimate

DifficultyHardWorkshop job
Parts and labour€80–1,500
Time1–4 h

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

Parts involved

alt fuel pumpalt fuel injectorsgas pressure regulatorafcm

Related codes

P0148P2A3FP01A8P2A23P01A4

References: law.cornell.edu, roushcleantech.com, performanceparts.ford.com, static.nhtsa.gov.