This code indicates a fault in the high voltage interlock circuit, which is a safety system designed to detect if any high voltage connectors are loose or disconnected. A 'High' status typically means the circuit has lost continuity or shorted to voltage, causing the vehicle to disable the high voltage battery to prevent electrical hazards.
Often caused by a connector that was not fully seated during previous service or maintenance, breaking the interlock loop.
The manual service disconnect plug may not be fully installed, or its internal interlock contacts may be damaged or corroded.
Chafed, broken, or rodent-damaged wiring in the low-voltage interlock loop causing an open circuit or short to voltage.
A degraded connection inside a high voltage component, such as the battery, inverter, or drive motor, causing an open circuit.
An internal failure in the module monitoring the interlock circuit, which is very rare and should only be considered after all physical connections and wiring are verified.
It is not recommended. The vehicle will likely disable the high voltage system, which may prevent the car from starting or cause it to run poorly in a reduced-power limp mode.
It is a continuous safety loop that verifies all high voltage connectors are securely attached. If a connector comes loose, the circuit breaks, and the system immediately shuts off high voltage to prevent electrocution or arcing.
No, replacing the computer is rarely the correct fix. This code is almost always caused by a physically loose connector, an unplugged service plug, or damaged wiring in the interlock loop. Replacing the control module without fixing the physical circuit will not resolve the issue.
Only if you follow the manufacturer's procedure to depower and isolate the high voltage system first, and wear appropriate personal protective equipment. If you are not trained in high voltage safety, leave this diagnosis to a qualified technician.