P0254: Injection pump fuel metering control A high (cam/rotor/injector), diesel
Injection pump A circuit high
Severity: Severity not verified — if the car runs badly, have it inspected
The sources read define the code and its causes but do not say how urgent it is, so no urgency class is claimed. Get it checked, more so if the engine will not start or loses power.
P0254 in short
P0254 is a diesel-only code for a high reading in the injection pump's fuel metering control A circuit. TroubleCodes.net lists a wiring short to positive, an injection pump failure or an engine computer fault as probable causes. Have it diagnosed before replacing the pump.
The injection pump has a fuel metering control circuit that the computer drives and monitors.
P0254 means that circuit reads high. TroubleCodes.net gives a short to positive voltage in the wiring as the first cause, then the pump, then the computer. The page gives no symptoms.
Most likely causes
These are general causes for this code across vehicles. None is specific to one make or model.
Cause 1: Wiring short to positive
Common general cause- Why it ranks here
- TroubleCodes.net lists a short to positive first.
- What would change this
- Rises if the harness shows damage or a short is found. Falls if wiring tests clean.
Cause 2: Injection pump failure
Common general cause- Why it ranks here
- TroubleCodes.net lists the pump second.
- What would change this
- Rises if wiring tests clean and the pump signals are wrong.
Cause 3: Engine computer malfunction
Common general cause- Why it ranks here
- TroubleCodes.net lists the computer last.
- What would change this
- Rises only after wiring and pump are cleared.
What to test first
Start at step 1. Each result tells you what it means and where to go next.
Step 1: Look over the wiring and connectors at the injection pump and its fuel control actuator and sensor for damage, corrosion or a loose plug.
IfDamaged, corroded or loose wiring or a connector is found
It meansThe circuit fault is the likely cause.
IfWiring looks fine
It meansHave the actuator and sensor signals tested.
Step 2: Have a shop compare the signal sent to the fuel control actuator with the signal returned by the metering sensor, using a bidirectional scan tool.
Warning:The injection pump is on a high-pressure diesel fuel system, and fuel can spray at high pressure if a line or fitting is opened. Leave pump work to a diesel shop.
IfThe two signals do not agree
It meansThe actuator, sensor or pump is suspect.
IfThe signals agree and the code returns
It meansA fault in the computer is possible but rare; recheck everything else first.
Symptoms
- Check engine light on
How to fix
Step 1: With the engine off and cool, look at the visible wiring and plugs near the injection pump for chafing, corrosion or a loose connector.
On your vehicle
We don't have reviewed vehicle-specific evidence for P0254 yet. The causes and tests above apply across vehicles.
Related codes
Sources and review
- On-Board Diagnostic Trouble Codes (generic code title list)
- P0254 trouble code: injection pump A, rotor/cam, circuit high
- Last reviewed
- Written by
- Saurabh K.
- Editorial review
- Pending
- Technician review
- Technician review pending
This page explains what a code usually means; it is not a substitute for a professional inspection. How we source and review · Report an error