P2A12 code meaning
Injection Pump Fuel Metering Control C (Cam/Rotor/Injector)
Powertrain system Generic code P2Axx codes Check engine light
What P2A12 means
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.
P2A12 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor0.5 to 6 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2A12
- Check engine light on
- Reduced power or limp mode
- Hard starting or stalling
Common causes of P2A12
- Most likelyOpen circuit or poor contact in the actuator C wiring or connector
- PossibleMetering actuator C coil failed or valve sticking
- Less likelyDirt or water in the fuel jamming the metering valve
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Injection pump metering cInjection pumpWiring harness
What each part of P2A12 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| A | Area: hybrid propulsion. |
| 12 | The exact fault in that area. |
What to do next
- Note P2A12 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2A12
What does P2A12 mean?
P2A12 means "Injection Pump Fuel Metering Control C (Cam/Rotor/Injector)". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P2A12?
Drive gently and only to a workshop. With P2A12 the car can go into limp mode (reduced power) to protect itself.
Will P2A12 fail an emissions test?
Yes, it can. P2A12 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2A12 to fix?
Difficulty: hard. A typical repair takes 0.5 to 6 hours of work. This is a job for a workshop.
Will P2A12 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.