P0631Fiat 124-spiderYears: 1996 - 2026
VIN Not Programmed / Ignition Key Transponder (P0631)
Reviewed by ASE Certified Technician
What does this mean?
Code P0631 relates to VIN programming or the ignition key transponder/immobilizer system.
Disclaimer: This diagnostic code is part of the standard OBD2 system and can apply to Fiat 124-spider models manufactured from 1996 to 2026. However, please note that the presence of this specific code depends on your vehicle's exact engine configuration, options, and production year.
Advertisement (In-Article)
Common Causes
Faulty ignition key transponder or immobilizer
PCM/ECM software needs update (TSB)
Internal PCM/ECM failure
Symptoms to Watch For
- Check Engine Light is illuminated
- Engine cranks but won't start