Charging status in the charging cable's charging module

The red and blue lights in the charging module indicate the status of ongoing and completed charging.
P5-1519-XC90 hybrid-USA-charger indicator lights
Charge module: 1. Red warning light, 2. Blue status indicator

When the charge module is initially plugged into a wall outlet, the red warning light will flash once to indicate that a startup safety check has been performed. When the safety check has been completed, the blue status indicator will glow steadily and the red warning light will be off. The charger is now ready to be used. If the red warning light continues to flash or glows steadily, a fault has been detected and the charger will not deliver power to the vehicle. Contact a Volvo retailer or a certified Volvo service technician.

When the charging cable is connected to the vehicle's charging socket, the blue light will flash once.

Charging cable connected to the vehicle's charging socket:
Indicator light's colorMeaning
Flashing blueCharging is in progress. The light flashes about once every other second.
Solid blueCharging completed. This will also be indicated in the instrument panel