P1631
Theft Deterrent Start Enable Signal Not Correct
P1631 is an OBD-II diagnostic trouble code meaning: Theft Deterrent Start Enable Signal Not Correct. Common causes: malfunction of the anti-theft system module, problems with the ignition key or transponder. Estimated repair cost: $56–278.
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
Related codes
Error P1631 by Vehicle Brand
FAQ
What does the P1631 code mean?
P1631 is an OBD-II diagnostic trouble code that indicates: Theft Deterrent Start Enable Signal Not Correct
What causes a P1631 error code?
The most common causes of P1631 include: 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.
How do I fix a P1631 diagnostic trouble code?
To fix P1631: Check the condition of the ignition key and transponder. Diagnose the anti-theft system module. Check the integrity of wiring and connections. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P1631?
Yes, but get it checked soon
How much does it cost to fix P1631?
The estimated repair cost for P1631 is $56–278. Actual cost depends on your vehicle, location, and labor rates.
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