Powertrain, generic (extended)

P2A20 Injection Pump Fuel Metering Control F Low (Cam/Rotor/Injector)

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2A20 is the low-signal fault of metering element F: the module measures a voltage or current on that drive line that is lower than the switching state allows. Shorts to ground, broken conductors on low-side switched circuits and connectors pushed out of their housing are the usual suspects. Element F is the sixth individually controlled metering element, so the code only concerns engines with six such units. No manufacturer describes P2A20 publicly; even Volvo, which uses the letter F, lists it only for range/performance. As an analogy, Saab's 2011 9-5 diesel sets P0253 for its regulator line shorted to ground and P0251 for an open line, each after one second, both as Type A faults. The high-signal counterpart of P2A20 is P2A21.

Likely causes

Drive line of element F shorted to ground
Terminal pushed out of the connector housing or broken conductor
Open coil in metering element F

Symptoms

  • Check engine light on
  • Reduced power
  • Rough idle

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€60–1,500
Time0.5–4 h

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

Parts involved

injection pump metering finjection pumpwiring harness

Related codes

P2A1EP2A1FP2A21P2A1CP0253

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