OBD-II Code P0253 — What It Means & How to Fix It

What Does This Error Mean?

P0253 means the fuel metering control circuit on Bank B of your injection pump is reading too low. The engine computer is not getting enough signal back from the metering solenoid. This is a diesel-engine code — gasoline vehicles rarely trigger it. You may experience hard starts, rough idle, low power, or poor fuel economy. Address it promptly to avoid prolonged engine damage from improper fueling.

Affected Models

All diesel vehicles 1996+
Common in Ford Power Stroke V8 diesels
Common in GM 6.6L Duramax
Common in trucks with dual-bank injection systems
Common in heavy-duty diesel applications

Common Causes

Open circuit or broken wire in the Bank B metering solenoid wiring
Failed or stuck-closed fuel metering solenoid on Bank B
Corroded or damaged connector causing a poor electrical connection
Low fuel pressure preventing the solenoid from operating correctly
ECM output failure not sending the correct signal to Bank B

How to Fix It

Scan for all stored and pending codes. P0253 often appears alongside other injection pump codes. Multiple codes help you understand whether this is an electrical problem or a fuel pressure problem.

Always document all codes before clearing them — the pattern tells the story.
Replace the diesel fuel filter as a first step. Low fuel supply pressure can cause the solenoid to behave abnormally and trigger low-signal codes. It's the cheapest fix to rule out first.

A clogged filter is a common culprit and is very inexpensive to address.
Inspect the wiring to the Bank B metering solenoid. Look for broken wires, chafed insulation, or pulled connectors. Check the full harness from the ECM to the pump.

Use a multimeter to check continuity on each wire. An open circuit (no continuity) means a broken wire.
Check the connector at the injection pump for corrosion or spread pins. Even minor corrosion raises resistance enough to read as a low-signal fault. Clean or replace the connector as needed.

Dielectric grease applied to clean pins helps prevent future corrosion.
If the wiring checks out, have the injection pump tested by a diesel specialist. The Bank B solenoid may need replacement, or the full pump may require rebuild or replacement.

Ask specifically about solenoid-only repair options before agreeing to a full pump replacement.

When to Call a Professional

Bank B metering control issues require a diesel-capable scan tool to view live injection data. If wiring and the fuel filter are both good, a diesel specialist needs to inspect the pump. Injection pump work is precision work — not suitable for general repair shops. Diagnosis typically costs $100–$200; pump repairs or replacement can be $500–$2,500.

Frequently Asked Questions

What is Bank B on a diesel injection pump?

On V-configuration diesel engines, the engine has two cylinder banks — Bank A (usually the side with cylinder 1) and Bank B (the opposite side). Some injection systems have separate metering controls for each bank. P0253 means the fault is specifically on the Bank B side of the pump.

Can low fuel pressure cause P0253?

Yes. If the fuel supply pressure is too low, the solenoid can't function properly. The ECM may interpret this as a low-signal electrical fault even when the solenoid itself is fine. That's why replacing the fuel filter first is the recommended starting point.

How much does it cost to fix P0253?

Fuel filter replacement: $50–$150. Wiring or connector repair: $100–$400. Solenoid replacement: $200–$700. Full injection pump rebuild or replacement: $800–$2,500. Always get a proper diagnosis first to avoid replacing the wrong parts.