B7F668
CosmeticB7F668 — Instrument Cluster: System Time Reset
Description
What the Code Means
Code B7F668 records a reset of the system time in the instrument cluster. Most often this happens after the battery is disconnected or replaced, when supply voltage is low, or when the cluster's internal memory fails. The instrument cluster loses the current time and date and reports this to the control module.
Symptoms
Symptoms
- Time and date reset in the instrument cluster;
- a warning lamp on the instrument panel may come on.
Causes and fixes
Diagnosis and Repair
- Reset the time and date through the iDrive menu or with the buttons on the instrument cluster.
- Check battery voltage — the code can point to a voltage drop or a problem in the charging system.
- If the fault returns after you set the correct time, the instrument cluster may need reprogramming or replacement.
Possible secondary damage
Secondary Issues
- The code doesn't cause mechanical damage;
- its appearance can still point to hidden battery or charging-system problems worth checking separately.