Tesla Roadster — Garmin GPS Week Number Rollover (WNRO) Firmware Fix
Since the summer of 2019, certain Garmin-based GPS units exhibit a week number overflow that forces the date to roll back to the year 2000. While driving behavior is unaffected, this causes incorrect timestamps in vehicle log files and battery health logs—complicating diagnostics and long-term pack analysis.
- Bad dates in logs: Events appear out of order or in the wrong year.
- Skewed battery reports: Health trends and diagnostics become unreliable.
- No drivability impact: Vehicle operation is normal, but service analysis suffers.
What this service includes
- Firmware reprogramming: We update the Garmin GPS module to permanently correct the WNRO behavior.
- Functional verification: Confirm proper time/date, GPS lock, and correct timestamps in sample logs.
- Non-intrusive: No changes to vehicle calibration or performance.
Service details
| Aspect |
Detail |
| Issue addressed |
Garmin GPS week number overflow (dates revert to year 2000) |
| Primary symptom |
Incorrect timestamps in vehicle logs and battery health logs |
| Effect on drivability |
None; this is a data integrity/diagnostics fix |
| Outcome |
Restored correct date/time and valid timestamps for accurate diagnostics |
Notes:
This service targets Garmin GPS firmware behavior only. It does not alter charging profiles, power delivery,
or other vehicle systems.
