PHEV operate very similar to traditional hybrid vehicles. The major difference is the addition of a larger higher capacity battery. This battery is meant to be primarily charged by plugging the vehicle into an outlet of charging station. PHEV powertrains still utilize a gasoline internal combustion engine, however the way the power is used is very different. Also, a PHEV adds an electric powertrain to the vehicle. A PHEV will operate on pure electric power until the battery is fully depleted. Then the vehicle will run on the internal combustion engine and can operate as a traditional hybrid electric vehicle or the internal combustion engine may simply charge the high-voltage (HV) battery and not provide power to the wheels.

These vehicles will have a 12 V battery to run accessories and an HV battery to run the electric motor. Due to the high-voltage it is extremely important to properly disable the battery before service is performed. The HV battery can cause serious injury or death if not handled properly. Make sure to consult the service information for proper disable procedure. Also, the 12 V battery will need to be disconnected and isolated when welding is performed so that damage does not occur. Hybrid systems normally will have their own separate cooling system typically with a special coolant. This will need to be serviced and filled separate from the gasoline engine cooling system. Finally, hybrid HVAC systems require special parts and fluids. Normally an insulated coolant storage tank is utilized to hold hot coolant to heat the passenger compartment when the gasoline engine is not running. Also, the air conditioner compressor will be electric so the AC works when the gasoline engine is off, this will require a special oil when being serviced.

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