Engine Fuel Injection Quantity - Error Detected
The ECM detected an issue with the engine fuel injection quantity calculations.
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 Engine Control Module (ECM) is trying to control how much fuel is injected but sees a problem, likely due to a bad sensor or wiring.
What the computer is actually seeing
The ECM monitors fuel flow based on inputs from fuel injectors, pressure sensors, and temperature sensors. When actual fuel delivery differs significantly from expected values, it triggers the fault code.
What a healthy reading looks like
Injection quantity should typically be within 5-20 mm³ per cycle depending on engine load and RPMs. Fuel rail pressure should be around 300-1500 PSI under 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.
- 11. Check for related fault codes and clear them. If P-codes appear again, proceed.
- 22. Inspect the wiring and connectors related to the fuel injectors and fuel pressure sensor for damage or corrosion. Repair any faults found.
- 33. Measure fuel rail pressure with a gauge. Ensure it's within 300-1500 PSI under normal operating conditions.
- 44. Test each fuel injector for proper operation, ensuring they open and close correctly without excessive leaks. Replace any faulty injectors.
- 55. If all electrical components and fuel pressure are normal, check ECM for updates or recalibrations.
Common causes
- Faulty fuel injectors
- Bad fuel pressure sensor
- Electrical issues (wiring/connectors)
- Low fuel pressure due to clogged filter or pump issues
- ECM calibration issues
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Moderate severity means it's best to fix it soon; drivability may be impacted, especially under load.
Will this code come back after repairs?
As long as all faulty components are addressed and wiring is secure, it should not return.
Why does this code sometimes pair with SPN 2003?
Both relate to fuel delivery, so if one has a problem, the other is likely to show an issue as well.
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