Ignition Key Signal Lost; Service Required
The system lost the signal from the ignition key.
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)
Your vehicle's computer isn't getting the signal it needs from the ignition key or switch. This could mean the key isn’t recognized, or there's a problem with the key itself or its connection to the system.
What the computer is actually seeing
The vehicle's computer is expecting a specific voltage signal (usually around 12V when the key is in the ON position) from the ignition switch or key fob. When that signal drops below critical levels or disappears entirely, the code triggers.
What a healthy reading looks like
Ignition switch signal should read 12V when in the ON position; if less than 9V, check wiring and connections.
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 the battery voltage and ensure it's above 12.4V. If low, charge or replace the battery.
- 22. Inspect the ignition switch for wear or damage; ensure it’s functioning correctly. Test voltage at the switch when the key is in the ON position.
- 33. Inspect wiring and connectors between the ignition switch and the computer for damage, corrosion, or loose connections.
- 44. Check if the key fob battery is weak; replace it and re-test ignition.
- 55. If all else checks out, consider replacing the ignition switch or checking the vehicle’s security system settings.
Common causes
- Faulty ignition switch
- Bad wiring or connectors
- Weak battery or low voltage in the key fob
- Damaged security module
- Key fob out of synch with the vehicle
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive my vehicle with this code?
It's drivable, but start issues may occur without warning.
Will this code come back after clearing it?
If the underlying issue isn't fixed, yes, the code will likely return.
Why does this code sometimes pair with other codes?
Other codes may indicate related system faults, often in the ignition or security circuits.
Working a real vehicle right now?
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