Engine Injector 1 Control Performance
Indicates a problem with the control of the first engine injector.
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 is struggling to control the first fuel injector, which affects how the engine runs and how much fuel is being used—like trying to get one part of a team to work when they aren't following the play.
What the computer is actually seeing
The engine control module (ECM) detects an abnormal signal from injector 1's control circuit, typically related to voltage that should be between 0.5V and 1.5V at idle but might be outside of that range.
What a healthy reading looks like
Injector voltage should be between 0.5V (off) and 1.5V (on), with pulse widths around 5-12 ms during operation, depending on engine speed 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. Check the wiring and connectors for Injector 1. Look for corrosion or loose connections. Decision point: If found bad connections, repair and retest; if good, proceed to step 2.
- 22. Measure the injector's resistance with a multimeter. Expected value: Typically around 12-16 ohms. Decision point: If out of spec, replace the injector; if within spec, proceed to step 3.
- 33. Check the ECM output for Injector 1 control signal using a scan tool or oscilloscope. Expected: Should see a pulsing signal indicative of injector control. Decision point: If no pulse, suspect ECM or injector driver issue; if pulsing, check fuel delivery.
Common causes
- Wiring issue between the ECM and injector
- Faulty injector driver circuit
- Defective injector
- ECM software issues
- Poor ground connections
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
It's generally safe to drive but expect reduced performance and efficiency until resolved.
Will this code come back after resetting?
If the underlying issue isn't fixed, it's likely to return after a short period.
Why is this code paired with other injector codes?
Issues with injector performance are often interrelated, causing multiple fault codes if the problem persists.
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 →