P3000 – Toyota Prius Hybrid Fault Code Diagnosis

P3000 – Battery Control System

The P3000 fault code relates to the battery control system in the Toyota Prius. If this code is displaying on your vehicle, it means that there is a problem with the HV battery ECU. The problem can be caused by several different sources, making P3000 a very generic and common fault code.

The P3000 fault code will often be accompanied with a suffix (for example, P3000-388) to help with diagnosing the source of this problem. The definition of these suffixes (or INF codes) can be found below:

 

P3000-123

Abnormal signal response from the battery ECU, often associated with a high-voltage battery system malfunction.

Possible causes include: HV battery system, Battery ECU

 

P3000-124

Abnormal signal response from the battery ECU, commonly associated with a blown fuse.

Possible causes include: HV battery system, Battery ECU

 

P3000-388

Discharge Inhibition Control Malfunction. This code is triggered when the battery’s state of charge decreases due to the vehicle being left in N position, running low on fuel or a malfunction occurring in the HV control system.

Possible causes include: HV control system, HV battery assembly or a fuel shortage

 

P3000-389

Drop of battery voltage detected by the battery ECU. This code is output if the HV battery is depleted or the battery control system malfunctions.

Possible causes include: HV control system, HV battery assembly

 

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