Fuel Injector High Side Circuit Short to Power
Indicates a short to power in the fuel injector high-side circuit.
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What it means (plain English)
The fuel injector is getting too much voltage due to a wiring issue, which can cause it to stay open or shut down completely.
What the computer is actually seeing
The Engine Control Unit (ECU) measures the voltage and current to the fuel injector. When it detects that the voltage exceeds the normal operating level (usually around 12V), it triggers this fault code.
What a healthy reading looks like
Fuel injector voltage should be between 12V and 14.5V during operation; current draw should not exceed the injector's specified ratings, usually between 1 to 3 amps.
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 leading to the fuel injector for any visible damage or wear.
- 22. Check for proper grounding at the injector circuit. Use a multimeter to measure resistance; it should be near 0 ohms.
- 33. Measure the voltage at the fuel injector while the engine is running. It should be between 12V and 14.5V. If higher, check for shorts in the wiring.
- 44. Disconnect the fuel injector and measure resistance across the injector; it should show a value (typically 12-16 ohms). If it’s shorted (0 ohms) or open (infinite), replace the injector.
- 55. If all checks are normal and the fault persists, consider testing or replacing the ECU.
Common causes
- Wiring harness chafed or damaged
- Faulty injector driver circuit in the ECU
- Shorted fuel injector
- Poor ground connection
Typical repair cost
$150-$600
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not recommended to drive as the engine may perform poorly and could lead to further damage.
Will this code come back after clearing it?
If the underlying issue isn't resolved, the code will likely return.
Why did this code appear after replacing a fuel injector?
If the new injector has a short circuit or if wiring was damaged during replacement, it could trigger this code.
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