Cylinder 1 Misfire Detected - Fuel Injector Circuit Malfunction
Indicates a misfire in cylinder 1 due to an issue with the fuel injector circuit.
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 computer sees that cylinder 1 isn't firing correctly, likely because the fuel injector isn't sending fuel or there's an electrical issue preventing it from working.
What the computer is actually seeing
The engine control module (ECM) monitors the crankshaft position sensor and detects that the RPMs fluctuate more than 2%, indicating that cylinder 1 is misfiring. This may result in increased emissions and rough engine operation.
What a healthy reading looks like
Fuel injector voltage should be between 12-14 volts while the engine is running. Injector pulse width should be around 2-5 ms at idle and up to 10-15 ms under 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. Inspect the wiring and connector to cylinder 1's fuel injector. Look for signs of damage or corrosion. If damaged, repair or replace as needed.
- 22. Check the resistance of the fuel injector. It should be around 12-16 ohms. If resistance is out of spec, replace the injector.
- 33. Verify fuel pressure at the injector using a pressure gauge. It should be 40-60 psi depending on the system. If pressure is low, check the fuel pump and filter.
- 44. Inspect the ignition components (spark plug, wire) for cylinder 1. Replace any faulty parts and retest the injector operation after repairs.
Common causes
- Faulty fuel injector
- Wiring or connector issues
- Ignition system problems (spark plug, wire)
- Low fuel pressure
- ECM malfunction
Typical repair cost
$$-$$$
Related codes
Frequently asked questions
Is it safe to drive with a P3011 code?
It's not ideal to drive as misfires can lead to engine damage over time. Fix it soon.
Will the code come back after I repair it?
If the underlying issue is fixed properly, the code should not return. Reset the code to confirm.
Why does this code sometimes pair with other cylinder misfire codes?
Misfires can often be related to similar issues across multiple cylinders, especially with shared components like fuel supply or ignition systems.
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