P0ADD - OBD II Trouble Code

Our automotive experts have put together the following information about the P0ADD diagnostic trouble code. We've provided the common symptoms that occur when this code is set along with the frequent repairs that address the issues related to the P0ADD code.

OBD II Fault Code

• OBD II P0ADD

OBD-II Code High voltage system may not operate is defined as a Hybrid Battery Negative Contactor Control Circuit/Open

The High Voltage System is engaged and disengaged through the Hybrid Control Module. If the Hybrid Control Module cannot control the circuit to the high voltage battery, code P0ADD will set.The Hybrid Control Module may disable the high voltage system.

High voltage system may not operate Symptoms

• High voltage system may not operate
• Vehicle will not charge

Common Problems That Trigger the P0ADD Code

• Auxiliary 12V battery failure
• High voltage control module failure
• Wiring issue