Cannot Charge on AC — Possible Poor Grid Power Quality

Common Symptoms

• Alert on the touchscreen: "Cannot charge - Poor grid power quality possible — Retry / Try other charge location or Supercharging"
• AC charging stops or won't start
• DC fast charging / Supercharging still works normally
• Driving is unaffected

Probable Causes (Ranked by Likelihood)

• Power supply disturbances from the external charging equipment or the electrical grid interrupting AC charging Likely
• Nearby electric devices drawing a lot of power on the same supply Possible
• A condition with the vehicle itself affecting AC charging (only if the equipment and grid causes are ruled out) Unlikely

Step-by-Step Diagnostic Procedure

1. If another alert appears alongside this one specifying the condition affecting AC charging, investigate that alert first — per Tesla's official guidance.

2. With a Mobile Connector: try a different wall outlet. If the vehicle charges, the original outlet was the problem; if not, the Mobile Connector may be.

3. With a Wall Connector: try different equipment (e.g. a Mobile Connector on a separate outlet). If the vehicle then charges, the Wall Connector or its wiring is at fault — have an electrician inspect the wiring connection.

4. Supercharging is unaffected, so a Supercharger or Destination Charger is a good fallback and a good test.

5. If the alert persists across multiple locations and different equipment, then the vehicle itself may be affecting AC charging — schedule Tesla service.

Frequently Asked Questions