Fuel Metering Unit - Control Performance
Issues with the fuel metering unit's performance.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The fuel metering unit isn't delivering the right amount of fuel for the engine's needs.
What the computer is actually seeing
The ECM expects fuel delivery rates within a specific range but detects rates outside that range, causing poor performance or efficiency.
What a healthy reading looks like
Fuel delivery should be within 300-600 mL/min at 1500 RPM under normal operating conditions.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 1Check fuel level in the tank. Should be above 1/4 tank. If low, refill and retest.
- 2Inspect electrical connectors and wiring to the fuel metering unit for damage or corrosion. Repair as needed.
- 3Test fuel pressure at the inlet of the fuel metering unit. Should be around 5-10 psi. If too low, check fuel pump and lines.
- 4Measure the fuel delivery rate from the fuel metering unit at idle. Should be within 300-600 mL/min. If low, consider replacement of the fuel metering unit.
Common causes
- Faulty fuel metering unit
- Clogged fuel filter
- Fuel supply issue
- Electrical connector problems
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Moderate severity means it's better to fix it soon; however, the vehicle can still be driven for a short time.
Will this problem come back after repair?
If the issue was a clogged filter or faulty wiring, and those are fixed, it shouldn't return.
Why do I also see codes SPN 2565 and SPN 3008?
These codes are often related to fuel metering issues and can indicate a broader problem with the fuel delivery system.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
Start guided diagnostic →