GM charger’s scheduled charging does not start at the programmed time, or starts at incorrect times, while manual charging works.

Steps:

• Sync time: Ensure your phone and GM app show the correct time and time zone. Re‑sync the charger’s time via the app if possible.
• Eliminate conflicts: Disable charging schedules in the vehicle and use only the GM charger schedule (or vice versa) to avoid conflicts.
• Test simple schedule: Set a single, short test window (e.g., start in 15 minutes) and observe behavior.
• Update firmware: Apply any available GM firmware updates that may address scheduling issues.

If schedules remain unreliable after these steps, the internal clock or scheduling firmware on the GM control board may be faulty. Use manual charging or vehicle‑side scheduling and consult GM support.