Fuel Injector Control Circuit - Open/Short Fault
Issue in the fuel injector control circuit detected.
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What it means (plain English)
The computer is getting a signal that there's something wrong with how the fuel injectors are being controlled, which can mean they aren't getting the right voltage or are shorted out.
What the computer is actually seeing
The Engine Control Module (ECM) monitors the fuel injector control circuit for expected voltage levels (typically 0-5V) and resistance values. An open or short in this circuit leads to incorrect injector operation.
What a healthy reading looks like
The expected voltage at the fuel injector terminals should be around 12V when the injectors are activated and below 1V when not. Resistance across injector terminals should be between 1.5 to 16 ohms.
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 obvious wiring damage in the engine bay or along the injector harness. If damaged, repair or replace the wiring.
- 22. Inspect all connectors to the fuel injectors. Ensure they're clean, secure, and free of corrosion. Repair if required.
- 33. Measure the voltage at the injector connector while cranking the engine. You should see the expected voltage (around 12V for activated injectors). If voltage is absent, investigate further down the circuit.
- 44. Test the resistance of the fuel injectors using a multimeter. If resistance is outside the 1.5 to 16 ohm range, replace the faulty injector.
- 55. If all wiring, connectors, and injectors check out, test the ECM for proper function. Replace the ECM if it appears to be sending incorrect signals.
Common causes
- Wiring damage in the injector circuit
- Faulty fuel injector
- Open circuit due to broken connectors
- Short circuit in the wiring harness
- ECM issues affecting injector signals
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code present?
No, do not drive the vehicle as it may cause engine performance issues and damage to the fuel system.
Will this code return after repair?
If the root cause is properly fixed, the code should not return.
Why does this code pair with other codes?
This code may appear alongside others related to fuel delivery or injector issues, indicating a systemic problem.
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