Ignition Key Signal Performance
There’s an issue with the signal from the ignition key or switch.
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)
The vehicle's computer is not getting the proper signal that the key is turned to the 'on' position, which can prevent the engine from starting or cause electrical issues.
What the computer is actually seeing
The vehicle's computer monitors the ignition key position for changes in voltage when the key is turned. It expects to see a voltage change that indicates the key is in the 'on' position, typically around 10-12 volts for the 'on' signal. If this signal is inconsistent or missing, the code triggers.
What a healthy reading looks like
When the key is in 'on', expect a voltage reading of 10-12 volts; when in 'off', it should read close to 0 volts.
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 ignition key and battery (if applicable); replace if dead or weak.
- 22. Inspect the wiring and connectors to the ignition switch; look for frayed wires or corrosion. Repair as needed.
- 33. Turn the key to the 'on' position and measure the voltage at the ignition switch harness; it should read 10-12 volts. If not, there's likely a wiring issue.
- 44. If the voltage is correct, check the ignition switch operation with a multimeter for continuity; replace if defective.
- 55. If all above checks out, consider scanning for other related DTCs and check BCM operation.
Common causes
- Faulty ignition switch
- Bad wiring or poor connections to the ignition switch
- Weak or dead key fob battery in push-to-start systems
- Faulty body control module (BCM)
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not advisable to drive until the ignition issue is resolved as it can lead to no-start conditions.
Will the code come back after clearing it?
If the underlying issue isn't fixed, yes, the code will likely return.
Why does this code pair with other ignition codes?
These codes often relate to the same system (ignition switch/signals), so issues can overlap.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
Start guided diagnostic →