Gencis
Posts: 55
Joined: Fri May 04, 2018 2:45 am

Not able to drive. P1A15 error.

Sun Jan 31, 2021 2:31 am

I am driving imiev MY201, US model.
During the autumn strange things started to happen. I could drive it but after slow charging at home (220V, 16A, or even 6A), I started to get yellow car error symbol and error code P1A15 (high voltage circuit). After clearing the error code and charging the 12V battery, I was able to start and drive it without any problems and even charge at fast-charging stations. But now in winter, after staying at home for several days or even week, I started to get this error code after each charging. And finally, I am not able to start the car at all.
Now, after I delete the error code and start the car again, I get a red battery warning light and the car does not start. After few attempts, I get again yellow car error light and P1A15 error code. Even if I clear the error code and try to charge, I get at once yellow car error light and P1A15 error code.

I measured a 12V battery (purchased 11.04.2018). When it is off, I get 12.46V. When I turn the key to the on position without load, I get 11.94V.

On this forum, I found some directions on how to measure EV-ECU (under the rear seat) but not sure if I measured the right module. The Key was in the ON position.
I included some photos that you could guide if i am wrong.
https://ibb.co/pLQxKnk
https://ibb.co/ZNgS10K
https://ibb.co/9tpTZX5
https://ibb.co/hL1sMs7

Where I should look for the problem?

gczero
Posts: 13
Joined: Thu Jan 21, 2021 1:01 pm

Re: Not able to drive. P1A15 error.

Sun Jan 31, 2021 7:20 am

Hi, I've got the same problem (P1A15) but on a 2017 CZero.

There is a long thread under "batteries"

viewtopic.php?f=23&t=4225&start=100

which might be worth a read.

There is also a NHTSA bulletin on this which includes a long troubleshooting procedure, about 25 steps!

https://static.nhtsa.gov/odi/tsbs/2015/ ... 7-6169.pdf

regards
Ged

kiev
Posts: 1427
Joined: Sun May 03, 2015 7:15 am
Location: The Heart o' Dixie
Contact: Website

Re: Not able to drive. P1A15 error.

Sun Jan 31, 2021 8:18 am

Gencis wrote:...
After clearing the error code and charging the 12V battery, I was able to start and drive it without any problems
...
I measured a 12V battery (purchased 11.04.2018). When it is off, I get 12.46V. When I turn the key to the on position without load, I get 11.94V.
...
Where I should look for the problem?


1. My first guess is that your 12V aux battery has been damaged by sulfation of the plates due to prolonged sitting at less than fully charged. It might be possible to recover but not likely--it would require charging at 14.4V for an extended time with constant monitoring and addition of water to the electrolyte.

2. The second reason for this code is found in the P1A15 discussion thread, namely the HV monitoring circuit in the MCU that measures and reports the voltage. There is a little amplifier board that has been found suspect in several cases but is less likely than number 1.

Another reason i tend toward #1 is that the problem went away in the Autumn after you charged the 12V, but returned after the car had been sitting a long time. A 12V aux battery can normally self discharge at 1-3 % per day, and must be kept fully charged at all times.
kiev = kenny's innovative electric vehicle

Gencis
Posts: 55
Joined: Fri May 04, 2018 2:45 am

Re: Not able to drive. P1A15 error.

Sun Jan 31, 2021 10:34 am

Thank you Kiev and Ged for the prompt reply.
First of all, I will try to check the 12V battery. I could take it from another car. The only thing is I get to figure out how to connect it, as it is bigger than the original imiev battery and I do not have jumpstart wires.
I hope tomorrow I will try and write the test results.

Gencis
Posts: 55
Joined: Fri May 04, 2018 2:45 am

Re: Not able to drive. P1A15 error.

Mon Feb 01, 2021 10:32 am

Today I tried two different 12V batteries. One was not a new but powerful 92 Ah AGM battery. Succeded to make a good connection. The result was the same as with the original battery. Then I put another, one-year-old, fully charged battery. The connection was not as good as on the first try. The result still the same. I turn the car on, it shows the yellow car and P1A15 error. I delete the error turn car off then again on and still has the same result. Made several attempts, even tried charging but without success.
Then I tried to connect through caniOn150 app and got weird results. It shows as the car is charged to 62 percent even it has 5 bars, it shows battery temperature +20C but the outside temperature is -2C, and car is standing for several weeks now. Also, it does not show any battery information - just black space where the chart should be shown.
As for the Torque program, I cannot connect it to the computer as it is not able to find the computer module of the car.

kiev
Posts: 1427
Joined: Sun May 03, 2015 7:15 am
Location: The Heart o' Dixie
Contact: Website

Re: Not able to drive. P1A15 error.

Mon Feb 01, 2021 10:55 am

That doesn't look like the EVECU in your photos. EVECU is underneath the metal bracket and has 4 connectors. But 11.9V is likely an indication of a weak or worn out aux battery, which may collapse under a load.

Is it possible to charge the Pack using the EVSSE or does that fail also?

Strange readings with CanIon, not sure why it can't read cell voltages.
kiev = kenny's innovative electric vehicle

Gencis
Posts: 55
Joined: Fri May 04, 2018 2:45 am

Re: Not able to drive. P1A15 error.

Tue Feb 02, 2021 9:52 am

I was able to connect to CanIon. I took another smartphone, installed app and it worked. Showed right temperature and other data.
Here I include few screenshots with parameters:
https://ibb.co/9WX7z7d
https://ibb.co/VmDc9ny

About EVSSE you mean if I can charge the main car battery with the J1772 plug. The answer is - I cannot. Whenever I try to charge it, yellow car sign appears at once and I get error code. I can delete it but the same happens in every attempt.

Could it be that this problem is caused by some moisture in charging sockets or anywhere else? We had some big temperature changes and humidity of nearly 100 percent. And the car was not used all this time.
Last edited by Gencis on Tue Feb 02, 2021 10:47 am, edited 1 time in total.

kiev
Posts: 1427
Joined: Sun May 03, 2015 7:15 am
Location: The Heart o' Dixie
Contact: Website

Re: Not able to drive. P1A15 error.

Tue Feb 02, 2021 10:33 am

The CanIon shots seem to show that your pack is in good shape.

Without measurements of the 12V aux battery voltage, or of any replacements used, etc. i will always doubt that you have solved that as a possible issue. i have seen this too many times and will need proof before believing that it has been ruled out. None of the ECUs will operate properly without a good strong 12V from the aux battery.

The measurements you made earlier were not of the EVECU, see previous messages.
kiev = kenny's innovative electric vehicle

Gencis
Posts: 55
Joined: Fri May 04, 2018 2:45 am

Re: Not able to drive. P1A15 error.

Tue Feb 02, 2021 10:44 am

To Kiev. No, I still did not solve the problem. I am still not able to drive the car.

I meant that I was able to connect CanIon. That is all.

So tomorrow I will try to take it out and try again to measure voltage.

Gencis
Posts: 55
Joined: Fri May 04, 2018 2:45 am

Re: Not able to drive. P1A15 error.

Thu Feb 04, 2021 11:07 am

Today I measured voltage at EVECU. I am not very good at reading electric diagrams but I think, I managed to found connector 111, terminal 107.
Before starting, I charged 12V battery and left charger connected when starting the car. I got again P1A15 error. I cleared it and measured voltage at connector 111, terminal 107. Voltage was only 0,51V.
Here are some photos
https://postimg.cc/8j9dgp0f
Image
https://postimg.cc/3yR3jh39
Image

As I understand, voltage is too low. Where next I should look for the problem?
Should I need to check some relay?

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