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  • The diagnostic trouble code (DTC) P3000 indicates “HV Battery Malfunction.”
  • The powertrain control module (PCM) will set this code if a Toyota vehicle’s high-voltage (HV) battery develops a problem.
  • Common causes of the P3000 code are low fuel level, an insufficiently charged HV battery, and HV battery assembly failure.
  • The symptoms of a P3000 code are the vehicle failing to start and an illuminated check engine light.

Hybrid vehicles have a high-voltage (HV) battery that powers the traction motor(s). When there’s a problem with the HV battery on a Toyota vehicle, code P3000 may be set.

What Does the P3000 Code Mean?

Code P3000 is a manufacturer-specific code, meaning that each automaker has its own definition. Toyota’s definition for the code is “HV Battery Malfunction”. The hybrid control module (HCU) will set the code when it perceives a problem with the HV battery.

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toyota hybrid battery
When there’s a problem with the HV battery on a Toyota vehicle, code P3000 may be set.

Note: The definition of code P3000 might be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.

What are the Common Causes of the P3000 Code?

The P3000 code is commonly caused by the following issues:

  • Low fuel level
  • High voltage battery assembly failure
  • The high voltage battery isn’t sufficiently charged

What are the Common Symptoms of the P3000 Code?

You might experience the following symptoms if the P3000 is stored:

How to Diagnose the P3000 Code

The P3000 is a manufacturer-specific code and it can be logged in certain vehicles with an OBD-II system. Diagnosing this trouble code can vary depending on the vehicle’s manufacturer.

If you’re not familiar with the process of diagnosing trouble codes, it might be best to go to a repair shop and have a trained mechanic do the job for you. You can also do it yourself if you think you’re confident in your DIY skills.

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Check out this video if you want to learn more about the diagnostic process:

How to Fix the P3000 Code

Unfortunately, there isn’t a single umbrella solution for the P3000 code because it is a manufacturer-specific code. As a result, the repair process will vary greatly between vehicles from different manufacturers. To determine the right repair procedure, you must first get an accurate diagnosis.

Once you’ve figured out the root cause of the P3000 code, you can look up credible online repair resources and how-to guides for possible solutions. Always consult your vehicle’s repair manual when it comes to troubleshooting and repairing diagnostic codes.

Consulting Chilton repair manuals can be useful, but an ALLDATA single-vehicle subscription is even better, as it provides detailed factory repair information for drivers who want to do repairs themselves. But if you aren’t an expert in automotive repair, it might be best to leave it to a professional.

About The Authors
Written By Automotive and Tech Writers

The Research Team is composed of experienced automotive and tech writers working with (ASE)-certified automobile technicians and automotive journalists to bring up-to-date, helpful information to car owners in the US. Guided by's thorough editorial process, our team strives to produce guides and resources DIYers and casual car owners can trust.

Reviewed By Contact Center Manager and Technical Reviewer at

William “Bill” Guzenski has produced hundreds of how-to videos for the automotive community. He’s an ASE Certified Master Automobile Technician, and is affiliated with the Specialty Equipment Market Association (SEMA). He loves attending race events and car shows throughout the country, as well as traveling in his 40-foot motorhome, exploring abandoned mines and ghost towns.

Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic. The accuracy and timeliness of the information may change from the time of publication.

File Under : OBD-II Trouble Codes Tagged With :
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