P0252 — Injection Pump Fuel Metering Control "A" Malfunction (Cam/Rotor/Injector)
Drivable short-term, but fix now to avoid damage.
What P0252 means
This code means the engine computer detected a malfunction in the 'A' fuel metering control of the diesel injection pump, which manages how precisely fuel is delivered. It often points to a failing metering control valve, wiring or connector faults, or a problem inside the injection pump itself. Repairs range from fixing wiring to replacing the metering valve or, in severe cases, the injection pump.
Common symptoms
- Check engine light is on
- Hard starting or engine won't start
- Rough idle or engine stalling
- Noticeable loss of power
- Black smoke or unusual exhaust
Common causes
- Faulty fuel metering control valve
- Damaged or corroded wiring and connectors
- Internal injection pump fault
- Low fuel pressure or contaminated fuel
- Failing engine control module (rare)
Typical repair cost
$200 – $1800
Varies by vehicle and root cause.
Frequently asked questions
Can I keep driving with a P0252 code?
It's not recommended. This affects fuel delivery in the injection pump, so you risk stalling, being stranded, or further damage. Get it diagnosed before driving more than necessary.
How much does it cost to fix a P0252 code?
Costs range widely, from about $200 for a wiring or metering valve fix to $1,800 or more if the injection pump itself needs replacement.
Is a P0252 code serious?
Yes. The fuel metering control is central to how the engine runs, and a malfunction can leave you with poor performance, stalling, or a no-start condition. Treat it as a priority.
Does P0252 always mean my injection pump is bad?
Not always. Many cases are caused by wiring, connectors, or the metering valve, which are cheaper to fix. A proper diagnosis is needed before assuming the whole pump must be replaced.