Ignition Key Cylinder - Input Signal Circuit Short to Ground
The ignition key cylinder signal is shorted to ground.
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What it means (plain English)
The computer is detecting that the signal from the ignition key cylinder, which tells it that the key is in and how it's turned, is being pulled to a ground constantly, instead of getting the correct voltage it expects when the key is in place.
What the computer is actually seeing
The PCM sees a continuous low voltage (close to 0V) when it expects a high voltage (around 5V to 12V) depending on the ignition state.
What a healthy reading looks like
When the key is turned to the ON position, the signal should be between 5V to 12V. In the OFF position, the signal should drop to near 0V, but never continuously at ground level regardless of key position.
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.
- 1Inspect the wiring and connectors between the ignition key cylinder and PCM for damage or corrosion. If damaged, repair or replace as necessary.
- 2Check the ignition key cylinder for correct operation. Use a multimeter to measure the voltage at the signal wire with the key in different positions. If it is shorted to ground, replace the ignition key cylinder.
- 3Test the signal wire for continuity and shorts to ground along its length. If you find a short, repair the wiring before proceeding.
- 4If no issues found with wiring or cylinder, check the PCM for fault codes or damage. Replace if necessary.
Common causes
- Damaged wiring or connectors between the ignition key cylinder and the PCM
- Faulty ignition key cylinder
- Short circuit in the wiring harness
- PCM malfunction
Typical repair cost
$$ - $$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not recommended as it may lead to ignition issues or a no-start condition.
Will this code come back after clearing it?
If the problem is not fixed, the code will likely return.
What happens if I ignore this code?
Ignoring it can result in intermittent starting issues or complete failure to start.
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