Uncommanded Injector Actuation
This code indicates that an injector is being actuated without a command from the ECM.
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 ECM (engine control module) is telling the injector to open or close, but it's happening without being asked, which can cause engine performance problems.
What the computer is actually seeing
The ECM measures the injector pulse width signal and sees a discrepancy; it expects a certain pattern based on driver input and engine conditions but sees timing or signal inconsistencies.
What a healthy reading looks like
Injector pulse width should be between 2.5 ms to 10 ms depending on engine load and RPM, and the commanded injector position should match actual position within 1-2 ms.
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 the wiring and connectors at the affected injector for damage or corrosion.
- 2Verify the injector's operation by performing a resistance check; expected resistance is typically between 12-16 ohms.
- 3Inspect for any engine sensor faults; check input signals to the ECM for correct readings (crank and cam sensors).
- 4Check ECM for software updates or error messages; reflash if needed. If you see no updates, proceed to inspecting the injector's command signal.
Common causes
- Faulty injector
- Wiring issues or corrosion
- Bad ECM or software glitch
- Faulty engine sensors (like crankshaft or camshaft position sensors)
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Not recommended; engine performance can be affected, risking further damage.
Will this code come back?
It can reappear if the underlying issue isn't resolved, like a faulty injector or wiring.
Why might this code pair with others?
It often pairs with injector-related codes or sensor malfunctions that affect engine operation.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
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