Powertrain, generic (extended)

P2A12 Injection Pump Fuel Metering Control C (Cam/Rotor/Injector)

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

The injection pump fuel metering codes cover electrically controlled actuators that decide how much fuel a diesel pump delivers – on distributor pumps the quantity solenoid, on common rail usually the inlet metering unit on the high-pressure pump, which a Bosch patent describes together with its flushing line. Actuators A and B have their own code groups (P0251 ff., P0256 ff.); C continues the series for pumps or engines with a third metering actuator, with its plausibility, low and high faults in P2A13–P2A15. P2A12 is the general fault of actuator C without a finer breakdown. No manufacturer documents P2A12 publicly; Saab's 2011 9-5 diesel, for example, reports an open circuit of its single pressure regulator as P0251. Depending on the system, rail pressure, power or speed are limited.

Likely causes

Open circuit or poor contact in the actuator C wiring or connector
Metering actuator C coil failed or valve sticking
Dirt or water in the fuel jamming the metering valve

Symptoms

  • Check engine light on
  • Reduced power or limp mode
  • Hard starting or stalling

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–2,500
Time0.5–6 h

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

Parts involved

injection pump metering cinjection pumpwiring harness

Related codes

P2A13P2A14P2A15P0251P0256

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