Powertrain, generic (extended)

P2A21 Injection Pump Fuel Metering Control F High (Cam/Rotor/Injector)

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2A21 marks a high reading in the circuit of the sixth metering element, F. The control module sees battery potential on the line or a current exceeding the driver limit – for instance when the harness rubs through onto a supply wire or the actuator coil is partly short-circuited. A driver stage that protects itself may then switch the output off, so the element can no longer meter at all. No manufacturer publicly documents P2A21. Saab's 2002 V6 diesel shows the consequences of a comparable short in one of its two pump valves: P0259 after 2.1 s, with pedal response limited to 30 % and rail pressure to 60 MPa. The low-side fault of F is P2A20, the functional one P2A1F.

Likely causes

Partly short-circuited coil of metering element F
Harness of element F chafed onto a supply wire
Damaged output stage in the engine control module

Symptoms

  • Check engine light on
  • Severely limited power and throttle response
  • Possible stalling

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–2,000
Time0.5–5 h

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

Parts involved

injection pump metering finjection pumpwiring harness

Related codes

P2A1EP2A1FP2A20P2A1DP0259

References: law.cornell.edu, saabwisonline.com, saabwisonline.com.