Injector Circuit/Open - All Cylinders
Injector circuit issue affecting one or more cylinders.
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What it means (plain English)
The engine control module (ECM) isn't getting the right signals from the fuel injectors. This means the injectors may not be firing correctly, causing poor engine performance or misfires.
What the computer is actually seeing
The ECM monitors the voltage and resistance of the injector circuits. If it sees a voltage outside the expected range, typically around 12 to 14 volts when active, it triggers this code.
What a healthy reading looks like
In active mode, voltage should be between 12V and 14V; resistance of the injector circuit should be around 12 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. Inspect the wiring and connectors for all injectors for damage or corrosion (chafed wires, loose connections). If found, repair or replace as necessary. Decision: Is the wiring intact? Yes: Go to step 2. No: Repair wiring.
- 22. Measure the voltage at the injector connector with the engine running. Voltage should be between 12V and 14V. Decision: Is voltage present? Yes: Continue to step 3. No: Check the ECM and wiring for faults.
- 33. Check the resistance of each injector using a multimeter. Each should be between 12 to 16 ohms. Decision: Are the resistances in range? Yes: Go to step 4. No: Replace the faulty injector.
- 44. If all injectors are functioning properly, replace or reprogram the ECM. Decision: Did the issue resolve? Yes: Job completed. No: Further diagnostics required.
Common causes
- Wiring harness issues (shorts, opens)
- Faulty injector(s)
- Open circuit in the injector driver
- ECM failure or corruption
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's best to avoid driving as poor injector performance can lead to engine misfires and damage.
Can this issue come back after fixing?
Yes, if wiring issues or injectors aren't permanently repaired, the code could return.
Why do I see this code with poor engine performance?
This code indicates injectors aren't working properly, which directly affects fuel delivery and engine performance.
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