Short answer: P3000 is Toyota’s own code for a fault reported by the battery control system. It is a wrapper code: it tells you the battery ECU has flagged a problem, and the specific cause is in the companion codes stored with it — most often P0A80 or P0A7F.
What you see on the dash
Red triangle and “Check Hybrid System”; reduced power and no EV mode.
What the code actually means
Rather than describing a single component, P3000 reports that the battery control system has detected an abnormal condition. Reading only P3000 tells you almost nothing; reading the codes stored beside it tells you everything.
Likely causes, in order
- Module degradation severe enough to trip the pack-level protection (most common).
- A companion sensor or wiring fault inside the pack.
- Battery ECU supply or communication issues.
- Sometimes nothing more than a stored history code after a repair or a low 12 V battery.
How to test before you buy anything
- Pull the full code list — P3000 on its own is not a diagnosis.
- Check freeze-frame data for pack voltage and current at the moment it set.
- Compare block voltages to find weak modules.
- Clear the code after any repair and road test to confirm it stays away.
Repair or replace?
Treat P3000 as a pointer, not a verdict. If it comes with P0A80 or P0A7F on a high-mileage pack, plan the replacement; if it is a lone history code after a repair, clear it and monitor.
Frequently asked questions
Is P3000 a battery code?
It is reported by the battery control system, but the underlying cause is usually described by a companion code.
Can I clear P3000 and keep driving?
You can clear it, but if the cause is real it will return. Clear it only after the fault has been addressed.
Why do I have P3000 and P0A80 together?
That pairing is the normal pattern for a failing pack: P0A80 names the fault, P3000 reports that the battery control system has flagged it.
Need a pack for this code?
We supply brand-new Ni-MH and Li-ion replacement packs for Toyota, Lexus, Honda and GM hybrids — 144 V to 288 V, with a capacity and resistance report for every unit. Browse packs by vehicle or send us the VIN and the scan and we will confirm fitment before you order.
Codes can have more than one cause. This page is a diagnostic starting point, not a substitute for testing the vehicle.