P1631
Theft Deterrent Start Enable Signal Not Correct
Severity
🔴 HighCan you drive?
Yes, but get it checked soon
Approx. repair cost
$56–278 (est.)
Symptoms
- Engine won't start
- The engine stalls immediately after starting
- The anti-theft system indicator is flashing
- Check Engine light comes on
- Problems with the ignition system
Causes
- Malfunction of the anti-theft system module
- Problems with the ignition key or transponder
- Open or short circuit in the anti-theft system circuit
- Engine control unit (ECU) malfunction
- Problems with communication between modules
How to Fix
- Check the condition of the ignition key and transponder
- Diagnose the anti-theft system module
- Check the integrity of wiring and connections
- Read fault codes of all modules
- Reprogram or replace the anti-theft system module if necessary