P0259 — Injection Pump Fuel Metering Control "B" Low (Cam/Rotor/Injector)
Drivable short-term, but fix now to avoid damage.
What P0259 means
This code sets when the engine computer detects a low signal or low circuit voltage on the 'B' fuel metering control of the diesel injection pump. It usually means the pump isn't getting or reporting the right metering signal, often due to wiring shorts, a failing metering valve, or a pump electrical fault. Repairs commonly involve checking the circuit and connectors first, then the pump's control components if needed.
Common symptoms
- Check engine light is on
- Hard starting or extended cranking
- Loss of power and poor acceleration
- Engine hesitation or stumbling under load
- Possible reduced-power limp mode
Common causes
- Short to ground in the metering control wiring
- Faulty fuel metering control valve in the pump
- Corroded or loose connector at the injection pump
- Internal injection pump electrical fault
- Failed pump control driver in the engine computer
Typical repair cost
$250 – $1800
Varies by vehicle and root cause.
Frequently asked questions
Can I keep driving with a P0259 code?
Short trips are sometimes possible, but it's risky to keep driving. A low metering signal can cause hard starting and power loss that gets worse, and the engine may quit. Have it diagnosed soon, and if it's running poorly or in limp mode, head straight to a shop.
How much does it cost to fix a P0259 code?
If the problem is wiring or a connector, repairs can be a few hundred dollars. If the metering valve or injection pump needs replacement, expect roughly $800 to $1,800 with parts and labor. Diagnosis confirms which path applies before any big spend.
Is a P0259 code serious?
Yes, it's fairly serious because it affects how much fuel the pump delivers. It can lead to a no-start or stranded vehicle if ignored. It's not usually an instant engine-killer, but it deserves prompt attention.
Does P0259 mean my injection pump is bad?
Not necessarily. A 'low' reading often comes from wiring or connector faults before the pump itself. A technician will test the circuit first, and only condemn the pump after confirming the wiring and metering valve are good.