Fuel Injector Quantity Error
Indicates an error in the fuel injector quantity reported vs expected.
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What it means (plain English)
The engine's computer is expecting a certain amount of fuel to be injected, but it's getting a different value, either too much or too little, which can cause performance issues.
What the computer is actually seeing
The engine control module (ECM) monitors fuel injection data. If the actual fuel injection quantity reported by the fuel injectors differs significantly (varies more than 10% from the expected value) during operation, it triggers this code.
What a healthy reading looks like
Expected fuel quantity is typically between 5-15 mm³ per injection at idle for many diesel engines, depending on engine design and load.
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. Perform a visual inspection of the wiring and connectors for the fuel injectors and ECM. Ensure all connections are secure and free of damage. If found, repair/replace as needed.
- 22. Check the fuel level in the tank. Ensure it is adequate. If low, add fuel and see if the code returns after a driving cycle.
- 33. Use a scan tool to read live data. Monitor the fuel injector quantity while the engine is running. Compare actual values to expected values.
- 44. If the actual fuel quantity consistently varies more than 10% from expected, isolate the injector(s) causing the issue by testing them individually, if possible.
- 55. Test fuel pressure with a gauge. Ensure it meets manufacturer specifications. If low, inspect the fuel pump and filter.
Common causes
- Faulty fuel injector(s)
- Fuel delivery issues (bad pump or clogged filter)
- Incorrect ECM calibration
- Wiring issues to the injectors or ECM
- Faulty fuel pressure regulator
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally not recommended; it can lead to poor performance and potential engine damage.
Will this code come back after clearing it?
If the underlying issue isn't fixed, it's likely to return.
Why does it pair with other injector codes?
Injector issues often impact multiple cylinders, leading to related codes being set.
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