Prius (Gen 1) :: Warning Lights Illuminated - P3030 Came On


Jul 14, 2014

I recently purchased a 2001 Prius from a state fleet auction. The car has 121,000 miles and was in the non-running part of the auction. It had been sitting at least four months. I decided to give it a go since it looked to be in decent condition.

It did not start because of a dead 12v battery. I bought a replacement battery, but it still did not start. The screen showed ~ 1/8 hybrid battery. The warning lights illuminated and it was never ready. I plugged in my code scanner and a P3030 code came up.

I got it towed home and started working on it. The P3030 code signifies a high voltage line snapped .

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Prius (2004-09) :: VSC, ABS And Power Steering Warning Lights Illuminated

Driving home early from work today, moments after leaving the parking lot the VSC warning light illuminated. Followed by ABS and Power steering lights a few seconds later.

Car drove normally. Systems seemed healthy.

I quickly pulled over, took this picture, and then power cycled the car. The warning lights turned [off] and stayed off for remainder of drive home (~30 min).

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I finally found the Prius I wanted. It's used. 2006. Gen II 220k miles. Bought at auction almost completely dead and no gas. After adding gas and driving so the main battery charges. It starts up great however the dash looks a little scary with nearly every warning light on.

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Prius (2001-03) :: Red Triangle / Hybrid Warning And Check Engine Lights Illuminated

This afternoon, after driving about 150 miles, I came home and shut off my 2001 Prius. It was sitting for about 20 minutes before I turned it back on to drive off. Almost immediately, the hybrid warning light came on on the MFD, the red exclamation mark light illuminated, as well as the check engine light, and the motor shut off. I popped the hood, and could hear a high pitched squeal coming from near the inverter. I called my dealer to ask the service department what I should do, and they just told me to bring it in and they will take a look at it. I live over an hour away, so I don't want to bring it there if I can avoid it. I then shut it off and let it sit for a few hours.

After reading about the possibility of the auxiliary battery being bad, I went and turned the Prius on, and then shut it off several times to reset the hybrid warning light (I had to do so in order to access the aux battery information through the MFD). It turned on without incident, and shut off fine, and after being reset the hybrid warning light shut off, as well as the red triangle light. Then, I went through the process of pulling up the battery voltage information through the MFD.

With the car off, and the lights and fans off, the battery voltage read about 10.0-10.5 V. With the lights and fan on, the voltage dropped to about 9.5 V. After getting those readings, I drove it down the road a little ways, just going about 20 mph. It seemed to work fine. The check engine light is still illuminated. With the motor running, the voltage reading was 13.2 V, and then when I got back from my test drive and shut it off, the voltage hovered at 10.6 V with the lights and fan on.

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Prius (2010-12) :: Hybrid Warning Light Illuminated While Driving

My 2010 III's hybrid warning light illuminated today while I was driving, and the vehicle shut down almost immediately.

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A few days ago I noticed when I started the car that both the HV/EV and ECO mode lights were illuminated. What does that mean?

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Prius (2001-03) :: 2002 - Fixing Code P3030?

I picked up a 2002 Prius with 164k, still on original battery. It giving code P3030 which evidently relates to a high voltage line snapped on the bus bar.

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Prius (2004-09) :: Code P3030, Check Engine Light Came On

we have a Prius from 2004.

We have had problems with the starter battery. This is because the car is so rarely driven. So to fix this I have charged the battery several times. But have not disconnected the battery cables before. I don't know if thats the reason why we have problems though. But you can suspect that.

One morning when we should drive the car we saw that the "check engine light" came up on the dashboard. And other warnings also.
I bought an OBD scanner and hooked it up. P3030..

So I took the hybrid battery out of the car and cleaned all poles and connections. I measured each battery cell to approx 7,6 V.
I also bought a new starter battery. Now, I have put all together again. But P3030 is still the case.

Is it possible to measure the voltages from the busbar module by measure on the contact to the ECU? I have tried that but don't get stable results. The voltages goes up and down all time..

My last hope is that a wire between battery busbar and ECU is broken. But I couldn't recognize that when I had the battery out of the car.

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Prius (2001-03) :: Error Code P3030 And P3009 - Bad Transmission?

Could a bad transmission cause error code P3030 and P3009?

This car has no other symptoms other than the Mil light and the check engine light.

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Prius (Gen 1) :: 2011 Getting Triangle And Main Battery Error On MFD / P3030 / P3000

2001 Prius

I was able to pull codes this evening ( no subcodes).

The codes are as follows:

P3000, Battery Control System Malfunction

P3030, Battery Voltage Detective Line Snapped

Will the P3030 cause a P3000 to pop up since it appears I have one of the 19 voltage detect lines corroded or broken?

Once I fix this issue, is there a chance that the P3000 will disappear?

I was just getting the triangle and the Main Battery error on the MFD up until yesterday. Yesterday, the ! with the car came on (Hybrid system) on the MFD. I did not check any codes until today. Car will currently not start at all.

Aux battery voltage is confirmed to be 12.3 volts via the MFD in the diagnostic mode so it's good to go.

No one around has a scan tool that will also pull the subcodes.

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Prius (2001-03) :: Engine Starts And Stalls In 3 Seconds - Code P3030

I read the forums and found nothing quite like mine.

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Caprice :: 1987 - Brake Warning Light Illuminated

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Phaeton :: Trunk Lights Illuminated Permanently?

Following a storm last week, my car had a completely discharged convenience battery. The carpet in the driver's (RHS) footwell was soaked, and I vacuumed out about a pint of water. The right front sunroof drain was blocked, so I massaged the duckbill valve and got this working again. The carpet is now completely dried out.

I fully recharged the battery using a mains charger, but two days later it was flat again. I ran a VCDS scan, found and reset lots of fault codes for low battery. I then discovered that the trunk lights were not turning off when the trunk lid closed, hence the battery discharge. The measuring block for trunk lights shows 0% however. The power trunk lid operates correctly from all switches and the remote.

All other vehicle functions seem to be working OK. I have removed the fuse for the trunk lights temporarily, but obviously would like to get them working properly again.

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All other vehicle functions seem to be working OK. I have removed the fuse for the trunk lights temporarily, but obviously would like to get them working properly again.

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