OBD-II Code P0254 — What It Means & How to Fix It

What Does This Error Mean?

P0254 means the injection pump fuel metering control signal on Bank B is reading higher than expected. The engine computer sees too much voltage or signal from the Bank B metering circuit. This diesel-specific code can cause black smoke, over-fueling, rough running, and poor economy. Bank B refers to the second cylinder bank on V-type diesel engines. Get it checked soon — over-fueling damages injectors and causes carbon buildup.

Affected Models

All diesel vehicles 1996+
Common in diesel V8 and V10 engines
Common in Ford 7.3L Power Stroke
Common in GM Duramax V8
Common in large diesel trucks and SUVs

Common Causes

Short to power in the Bank B metering solenoid wiring
Failed metering solenoid internally shorted or stuck open
ECM fault sending an excessively high signal to Bank B
Damaged connector with shorted pins causing high-voltage readings
Injection pump internal failure causing over-delivery on Bank B

How to Fix It

Scan for all codes present. If you only see P0254 without any Bank A codes, the fault is localized to the Bank B circuit. This helps narrow down where the short or fault is coming from.

Multiple codes across both banks may indicate a shared wiring or fuel pressure issue.
Inspect the entire wiring harness from the ECM to the Bank B injection pump solenoid. Look specifically for wire insulation that's rubbed through against metal and created a short to a power wire.

Pay close attention to areas where the harness bends sharply or passes through brackets.
Test the voltage at the Bank B metering solenoid connector with a multimeter, key on and engine off. If voltage is significantly above spec (usually 5V reference), you have a short to power in the wiring.

Compare your reading to the spec in your vehicle's service manual.
Inspect and clean the connector at the injection pump. Check for bent or shorted pins that may be bridging two circuits together. Replace the connector if pins are damaged.

Even a tiny metal shaving bridging two connector pins can cause a short-to-voltage code.
If wiring and connector checks pass, have the injection pump bench-tested or inspected by a diesel specialist. The internal metering valve for Bank B may be stuck in the over-fuel position.

Ask the shop to check whether just the solenoid or valve can be replaced — not always the whole pump.

When to Call a Professional

P0254 is not a DIY-friendly repair beyond the initial wiring checks. Injection pump diagnosis requires a diesel specialist and the right scan tool software. If wiring looks fine, don't guess — take it to a shop before spending money on parts. Full pump replacement, if needed, runs $1,000–$2,500 installed at a reputable diesel shop.

Frequently Asked Questions

Is P0254 dangerous to drive with?

It depends on severity. If you're just seeing the light with no noticeable driving symptoms, short local drives may be okay. But if you see black smoke, feel rough running, or notice a power change, stop driving. Continued over-fueling damages injectors and can foul the diesel particulate filter (DPF), leading to much larger repair bills.

Could this be an ECM problem?

It's possible, but ECM failures are rare. The ECM controls the signal sent to the solenoid — if it's sending too much, P0254 can appear. However, a short in the wiring (which is far more common) can also read like an ECM fault. Always diagnose the wiring first before suspecting the ECM.

How much does it cost to fix P0254?

Wiring repair: $100–$400. Connector replacement: $50–$200. Injection pump solenoid: $200–$700. Full pump replacement: $1,000–$2,500 installed. ECM replacement (worst case): $500–$1,500.