Powertrain, generic (extended)

P2A1F Injection Pump Fuel Metering Control F Range/Performance (Cam/Rotor/Injector)

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P2A1F says that metering element F does not reach its target although its wiring checks out. Volvo and Mack document it for their US17-generation 11 and 13 litre engines, alongside P0257 and P2A17. On these engines three pumping injectors, driven through rockers by double cam lobes, deliver fuel into the rail at up to roughly 35,000 psi. Two causes are named in their bulletins: an injector lobe on the assembled camshaft that has turned on the shaft – checked by barring the engine over and watching each lobe – and genuine rail pressure problems listed together with leak and low-pressure supply codes. For the latter, Volvo requires current Premium Tech Tool software and the guided test. Expect lack of power; repairs range from software to a new camshaft.

Likely causes

Injector lobe spun on the assembled camshaft (Volvo/Mack US17)
Low-pressure supply too weak or a leak in the rail system
Worn pumping injector of element F
Outdated workshop software misleading the guided test

Symptoms

  • Check engine light on
  • Lack of power
  • Rail pressure codes stored alongside

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€200–8,000
Time1–16 h

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

Parts involved

injection pump metering finjection pumpfuel injectorwiring harness

Related codes

P2A1EP2A20P2A21P0257P2A17P0087

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