Chevrolet Volt service high voltage charging system warning message on Chevrolet Volt

Some Chevrolet Volt owners report experiencing the "Service High Voltage Charging System" warning message, which typically indicates issues with the hybrid battery coolant level or a malfunctioning coolant level sensor. This warning is a common problem among Chevy Volts and Cadillac ELRs and can lead to the disabling of the battery charging system, preventing the vehicle from being charged through the J1772 connector. Many owners find that reprogramming the BECM and HPCM2 modules is often necessary to resolve the error, even when there is no inherent issue with the vehicle. Additionally, it is crucial for owners to wear appropriate Personal Protection Equipment, such as safety glasses with side shields, before attempting any repairs on the high voltage system. Promptly addressing this warning message is advisable to ensure the proper functioning of the high voltage charging system in the Chevrolet Volt.