PATS Low Key Count Detected
The B1213 code indicates that the Passive Anti-Theft System (PATS) control module has detected fewer than the minimum required number of programmed transponder keys in its memory. This code is common in Ford group vehicles and is triggered when the system has only one valid key programmed, which prevents the engine from starting as a security measure. The condition may result from recent reprogramming that only registered one key, battery disconnection causing memory loss in the BCM or PATS module, a damaged or unrecognized transponder key, a faulty PATS module, or improper diagnostic tool use that erased the key memory.
1. Commonly Affected Makes
2. Most Common Causes
- System was recently reprogrammed with only one key registered
- Memory loss in the BCM or PATS module due to battery disconnection or electrical fault
- Damaged or unrecognized transponder key
- Faulty PATS control module
- Improper use of diagnostic tools that erased registered keys
3. Symptoms You Will Notice
- Engine cranks but does not start
- Security indicator light flashing or staying on
4. Step-by-Step Diagnosis
Verify that at least two valid transponder keys are programmed to the PATS module
Check for any aftermarket or damaged keys that may not be recognized
Inspect battery voltage and connections for recent disconnection or low voltage events
Use a professional scan tool to read PATS module data and key count
If necessary, reprogram all keys following the manufacturer's procedure
5. Frequently Asked Questions
Is it safe to drive?▼
No, the vehicle will not start and is not safe to drive. The PATS system prevents engine start to deter theft.
How much does it cost to fix?▼
Reprogramming keys typically costs $100-$200 at a dealership or locksmith. If the PATS module needs replacement, expect $400-$800 including parts and labor.