P1639high severityPowertrain
Vehicle ID Block Corrupted or Not Programmed
on 2021 Ford Mustang Mach-E Standard Range Dual Motor AWD · RWD
What this code means
The Vehicle Identification (VID) block in the PCM is corrupted or has not been programmed. The VID block contains critical vehicle configuration data.
Symptoms
- Check Engine Light
- Vehicle may not start
- Various systems may not function correctly
- Emissions monitors may not run
Common causes
- New PCM installed without VID programming
- PCM memory corruption
- Failed PCM programming procedure
- Battery disconnected during programming
Diagnostic steps
- Attempt to reprogram VID block with Ford diagnostic tool
- Verify VIN matches between vehicle and PCM
- Check for PCM software updates
Repair notes
Reprogram VID block using Ford IDS/FDRS diagnostic tool. Dealer-level equipment typically required.
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