P0259: Injection Pump Fuel Metering Control B High (Cam/Rotor/Injector)

Fuel metering actuator B is a second electrically controlled metering valve on a diesel injection pump; A has the codes P0251–P0255. P0259 means its circuit reads high or draws too much current – a short to voltage or a shorted turn. Saab's 3.0 V6 diesel, whose pump has two metering valves, uses it for an internal short in one of the valves lasting over 2.1 s: limp mode with limited pedal response, injection quantity and rail pressure (60 MPa), and the warning light if it recurs on the next trip. GM and Ford use other codes for this part (P0090–P0092, P0001–P0004).

Medium severity. Can I keep driving?Drive as little as possible and go to a repair shop. If you smell fuel or the engine is shaking badly, do not keep driving.

Symptoms

Check engine light on
Limp mode with limited power and speed
Hard starting, engine may stall

Most likely causes

Metering valve B shorted internally
Control wire to the valve shorted to voltage, chafing
Connector at the valve corroded or wet
Driver stage in the engine module faulty

What to check, in order

Start with the simplest. You can tick off each step.

Check the connector and wiring of the injector indicated
Check the sensor's ground and make sure the signal wire is not receiving voltage from another circuit.
Measure the resistance and compare it with the manufacturer's specification
Check the control signal with an oscilloscope; on direct injection or diesel engines, leave this to a repair shop because of the high voltages
On diesels, check the per-cylinder injection corrections

Good to know

Repair difficulty: hard
It can trigger limp mode.
It affects emissions.

What each character of P0259 means

P: Powertrain: engine and transmission
0: Generic code: same on every make
2: Fuel injection
59: Specific fault in that system

Frequently asked questions

Can I keep driving with code P0259?

Drive as little as possible and go to a repair shop. If you smell fuel or the engine is shaking badly, do not keep driving.

What causes code P0259?

The most common causes are: metering valve B shorted internally; control wire to the valve shorted to voltage, chafing; connector at the valve corroded or wet.

Related codes

Sources

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.