Open in the power or ground circuit at the fuel rack position sensor (OBD-Codes.com, rated likely). Short to power in the signal circuit to the sensor (OBD-Codes.com, rated possible). Failed fuel rack position sensor (OBD-Codes.com, rated possible). Wiring issue (RepairPal). Fuel injection pump actuator failure (RepairPal). Fuel injection pump failure (RepairPal). Failed PCM, rated unlikely by OBD-Codes.com (both sources).

Clean or repair corroded or damaged connectors at the pump sensor. Repair an open power or ground wire, or a signal wire shorted to power. Replace the fuel rack position sensor / fuel quantity actuator if circuits test good. Replace the fuel injection pump if it is at fault (RepairPal lists fuel pump replacement as the common repair). Replace and program the PCM only after the other parts are ruled out.

P0254🔧 Diesel fuel injection pump meteringDrive with caution, fix soon

P0254: Injection Pump Fuel Metering Control A High (Meaning, Causes, Fixes)

Q: What does P0254 mean?

P0254 is a diesel code that means the engine computer saw the fuel metering control signal from the injection pump stay too high for too long. OBD-Codes.com treats it as an electrical circuit problem, most likely an open in the sensor's power or ground, or a short to power in the signal wire. RepairPal rates it 'Urgent' and lists the pump actuator, the pump itself, wiring and the PCM. On diesel engines with an injection pump, the fuel metering control 'A' is mounted on or inside the pump. OBD-Codes.com describes it as a fuel rack position (FRP) sensor plus a fuel quantity actuator: the sensor turns the amount of fuel the actuator is delivering to the injectors into a voltage signal, and the powertrain control module (PCM) uses it to decide how much fuel to give the engine. It also checks that signal at initial key on. P0254 is the 'high' version: OBD-Codes.com says it sets when the sensor voltage stays above a set level, usually over 4.8 V, for too long, and that it is usually an electrical circuit issue. RepairPal explains it in terms of pump pressure: the fuel pump control actuator controls the injection pump's output pressure, and the PCM sets P0254 when it detects an incorrect signal from that actuator. OBD-Codes.com says the code applies to diesel OBD-II engines generally but shows up more often on some Mercedes-Benz and VW vehicles, and searches for it center on Cummins and Mitsubishi. Which part of the circuit counts as 'A' depends on the vehicle, so check its service information.

Q: Can I keep driving with P0254?

Drive with caution, fix soon. Get it checked soon. The sources differ here: OBD-Codes.com calls P0254 not severe because it is an electrical fault the engine computer can usually compensate for, while RepairPal rates it 'Urgent' and says the engine may lose performance or stall. Since a stall can happen while driving, don't put off a diagnosis.

Reviewed 2026-10-26 · Based on 2 cited source(s)

What P0254 means

On diesel engines with an injection pump, the fuel metering control 'A' is mounted on or inside the pump. OBD-Codes.com describes it as a fuel rack position (FRP) sensor plus a fuel quantity actuator: the sensor turns the amount of fuel the actuator is delivering to the injectors into a voltage signal, and the powertrain control module (PCM) uses it to decide how much fuel to give the engine. It also checks that signal at initial key on. P0254 is the 'high' version: OBD-Codes.com says it sets when the sensor voltage stays above a set level, usually over 4.8 V, for too long, and that it is usually an electrical circuit issue. RepairPal explains it in terms of pump pressure: the fuel pump control actuator controls the injection pump's output pressure, and the PCM sets P0254 when it detects an incorrect signal from that actuator. OBD-Codes.com says the code applies to diesel OBD-II engines generally but shows up more often on some Mercedes-Benz and VW vehicles, and searches for it center on Cummins and Mitsubishi. Which part of the circuit counts as 'A' depends on the vehicle, so check its service information.

Severity: can I keep driving?

Drive with caution, fix soon

Get it checked soon. The sources differ here: OBD-Codes.com calls P0254 not severe because it is an electrical fault the engine computer can usually compensate for, while RepairPal rates it 'Urgent' and says the engine may lose performance or stall. Since a stall can happen while driving, don't put off a diagnosis.

Common symptoms

Check engine light on (OBD-Codes.com)
Decrease in fuel economy (OBD-Codes.com)
Decreased engine performance (RepairPal)
Engine may stall (RepairPal)

Likely causes

Roughly most to least common, based on the sources below. Your vehicle may differ.

Open in the power or ground circuit at the fuel rack position sensor (OBD-Codes.com, rated likely)
Short to power in the signal circuit to the sensor (OBD-Codes.com, rated possible)
Failed fuel rack position sensor (OBD-Codes.com, rated possible)
Wiring issue (RepairPal)
Fuel injection pump actuator failure (RepairPal)
Fuel injection pump failure (RepairPal)
Failed PCM, rated unlikely by OBD-Codes.com (both sources)

Diagnostic steps you can do

⚠ Before you start

Work on a cool engine, parked on level ground with the parking brake set. Never work under a car supported only by a jack.

Check for technical service bulletins for your year, make and model first, since the issue may be known with a known fix.
Find the sensor connector on or beside the injection pump and look over the wiring and connector for scraping, rubbing, bare wires, burn spots or melted plastic. A broken power or ground wire, or a signal wire rubbed against a powered wire, can push the signal high.
Unplug the connector and check the terminals for burning or green corrosion. OBD-Codes.com suggests cleaning them with electrical contact cleaner and a plastic brush, letting them dry and applying electrical grease.
Clear the code with a scan tool and drive. If it doesn't come back, OBD-Codes.com says the connection was most likely the problem.
If the engine stalls or loses power, have it diagnosed promptly rather than continuing to drive it.

Typical fixes

Clean or repair corroded or damaged connectors at the pump sensor
Repair an open power or ground wire, or a signal wire shorted to power
Replace the fuel rack position sensor / fuel quantity actuator if circuits test good
Replace the fuel injection pump if it is at fault (RepairPal lists fuel pump replacement as the common repair)
Replace and program the PCM only after the other parts are ruled out

Repair costs vary widely by vehicle, region, parts brand and shop, so we don't quote prices. Get a written estimate after diagnosis.

🛠 When to call a pro

OBD-Codes.com's test: key off, unplug the FRP sensor, then key on engine off and measure between the harness power and ground terminals; expect 12 V or 5 V depending on the manufacturer's spec, otherwise repair power or ground or suspect the PCM. Then measure the signal terminal, which should read 5 V; if not, repair the signal wire or suspect the PCM.
If all circuit tests pass and P0254 keeps returning, OBD-Codes.com points to the FRP sensor / fuel quantity actuator, and says the PCM can't be ruled out until that part is replaced. A replacement PCM must be programmed to the vehicle.
OBD-Codes.com gives the typical threshold as signal voltage over about 4.8 V for too long; check the vehicle's service information for the exact value.
The sources disagree on severity and focus: OBD-Codes.com rates P0254 not severe and points mainly to wiring opens or shorts and the FRP sensor, while RepairPal rates it 'Urgent', lists stalling, and names the pump actuator, the injection pump itself and fuel pump replacement as common repairs.

Where to buy

Plain search links. Always match parts to your exact year, make, model and engine.

OBD2 scanners on Amazon Parts at Advance Auto Parts catalog at RockAuto

FAQs

Can I drive with P0254?

Maybe for a short time, since OBD-Codes.com says the PCM can usually compensate for this electrical fault. But RepairPal rates P0254 'Urgent' and says the engine may stall, so get it diagnosed soon.

What is the difference between P0253 and P0254?

Both point to the same injection pump fuel metering control 'A'. P0253 means the signal voltage is too low (OBD-Codes.com says usually under 0.3 V), often from a short to ground. P0254 means it is too high (usually over 4.8 V), most likely from an open in the sensor's power or ground or a short to power on the signal wire.

Is P0254 a diesel-only code?

Yes. Both sources describe the diesel fuel injection pump, and OBD-Codes.com says it applies to diesel fueled OBD-II engines.

Does P0254 always mean a new injection pump?

No. OBD-Codes.com treats it mainly as a wiring or sensor problem and recommends checking service bulletins, connectors and wiring first, then testing the sensor circuit. RepairPal does list fuel pump replacement as a common repair, so a proper diagnosis is worth it before buying an expensive pump.

Sources

Last reviewed 2026-10-26. Code definitions and repair steps can vary by manufacturer. Confirm with your vehicle's service information.