Fuel Injector Delivery Error
Fuel injector is delivering an incorrect amount of fuel.
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 injector is either spraying too much or too little fuel into the engine compared to what the Engine Control Module (ECM) expects.
What the computer is actually seeing
The ECM monitors the fuel injector's performance using input from various sensors and expects a specific amount of fuel delivery. If the amount is outside of the expected range, it triggers a code.
What a healthy reading looks like
Injector pulse width should be within 1.5 to 5.0 milliseconds under normal operation, with rail pressure around 25000 to 30000 kPa during operation.
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.
- 11. Check the fuel level in the tank. Ensure it's above 1/4 tank to eliminate low fuel issues.
- 22. Inspect wiring and connectors related to the fuel injector for damage or corrosion. Repair if needed.
- 33. Check the fuel pressure using a gauge. It should be within 25000 to 30000 kPa. Replace the fuel pump or regulator if not within range.
- 44. Test the fuel injector's operation using a scope tool or perform a resistance check (should be around 12-16 ohms). Replace if out of spec.
- 55. Check for any updates or reprogramming available for the ECM, as a software issue can cause incorrect readings.
Common causes
- Faulty fuel injector
- Clogged fuel filter
- Fuel pressure issues
- Wiring/connector faults
- ECM software issue
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's best to fix it soon, as poor fuel delivery can affect engine performance and emissions.
Will this code come back after clearing it?
If the root cause isn't addressed, it will most likely return after clearing.
Why does this code pair with SPN 4034?
SPN 4034 is related to injector delivery performance, so issues with one will affect the other.
Working a real vehicle right now?
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