PATS Key Not Programmed or Failed to Program
The vehicle's Passive Anti-Theft System cannot recognize the key.
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What it means (plain English)
The car's computer can't identify the key because it's not programmed correctly or is damaged.
What the computer is actually seeing
The vehicle's computer tries to read the key signal from the ignition switch and doesn't receive a valid response, usually expecting a unique key code in the range of 1-8 volts depending on the system.
What a healthy reading looks like
Key signal voltage should be between 0-12V, typically around 5V for a valid program key.
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 wiring and connectors for the ignition switch and PATS module. Repair any corrosion or loose connections.
- 22. Check the key battery for proper voltage (should be above 2.5V). Replace if low.
- 33. Attempt to reprogram the key using the manufacturer's specific procedure. If programming fails, check for faults in PATS module functionality.
- 44. Test with another known-good key to see if the issue persists. If the good key works, it's likely a faulty original key.
- 55. If using a scan tool, check for related DTCs that may indicate PATS module or ignition switch problems.
Common causes
- Unprogrammed key
- Faulty ignition switch
- Corroded key battery contacts
- Damaged or weak key fob battery
- Wiring issues or damaged connectors
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not recommended to drive as the vehicle's anti-theft system may prevent starting.
Will this code come back?
If the underlying issue isn't fixed, such as a faulty key or damaged wiring, yes.
Why does this code pair with B2690?
B2690 relates to key recognition failures, often happening in conjunction with the B2680 if multiple keys malfunction.
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