2015 Porsche Panamera S E-Hybrid failure

Edward from Middle Village Owner/Technician Posted   Latest  
Question
Electrical
Driveability
2015 Porsche Panamera S E-Hybrid 3.0L (MCG.FA) 8-spd (Tiptronic S)—WP0AD2A78FL040253
No Crank / No Start

I'll start by saying my knowledge of hybrid vehicles is basic and I'm hoping members might have some insight on a 2015 Porsche Panamera S E-Hybrid. WP0AD2A78FL040253

Vehicle came in driving with a CEL. Diagnosed original fault unrelated to hybrid system. Vehicle sat for a day or two while waiting on parts. When we went to move the car in to perform the repair, instrument cluster states hybrid system failure.

I'm not sure where to start the diagnostic process. If anyone can offer assistance, that would be greatly appreciated. 

Attached are pictures of faults from my autel. 

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Nicholas from Brooklyn

   

Diagnostician
   

Hi, I know this sounds basic, have you checked the 12 volt battery? If not fully charged will not turn on the High voltage system. Also It might be helpful to know what the other repair was for the Check Engine light.

+3

Edward from Middle Village

 

Owner/Technician
 

Yup. Sorry, I should've mentioned that. The 12V battery was replaced with a known good and the key fob battery was replaced as well. When the ignition is turned on, all accessories light up as normal.

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Michael from Clinton

 

Mobile Technician
 

You should test the service battery as low voltage can cause all types of false codes. Where the vehicle sat for a couple of days there may be a parasitic draw.

+3

Edward from Middle Village

 

Owner/Technician
 

I have not yet performed a parasitic draw test. The client did not mention any symptoms regarding any voltage issues and we had the car for a couple days before getting to work on it and had no problems starting it to move it in and out everyday. I even drove the car 10+ miles in order to set emissions monitors. We were looking into an issue where the hatch would open by itself if the vehicle were to remain unlocked for a period of time. However, the vehicle was locked during the time where it sat waiting for parts. Not to say that this issue couldn't be stemming from there, just unsure if that would cause my issues. Stranger things have happened. 

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Joel from Soquel

   

Diagnostician
   

make sure the 12 v babtery is fully charge , than clear the codes on every computer bucause this hybried vehicle when they a a code on hc ecu or hv batery ecu they disable the starting sytem even if you fix the problem , until you clear the codes funtions are restored

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Nicholas from Brooklyn

   

Diagnostician
   

Which module are these codes from. One of your codes say that the High voltage system is deactivated do to malfunction. Is the autel able to test the Hybrid control unit?

I would check the 12 volt service plug near the 12volt battery make sure it is installed correctly.

+1

Steven from Spokane

 

Mechanic
 

I'm in agreement with Joel Navarro. You need to make sure the 12V battery is fully charged, then clear all faults (at least for the modules that the Autel can access). Some systems don't come back to life until you clear the faults. These Porsche vehicles can be difficult to diagnose even with the factory scan tool, so only having the Autel would worry me.

Anytime you are scanning a German vehicle, you should have a battery maintainer on it, unless you are sure the battery is in very good shape. The German cars I work on will drain the battery with the key on and scanning and diagnosing. The battery maintainer should not exceed 15V because some modules will set faults for over-voltage and then you'll be in the same situation as a low battery (faults stored and systems disabled).

Also, new batteries that have been sitting on the shelf for a while may have lost some of their charge, so a new battery still should be charged up, either by normal driving or with a charger.

+3

Edward from Middle Village

   

Owner/Technician
   

Yeah totally with you Steven and everyone here helping me cover the basics. I had the same faults with my AutoLogic assist plus, the battery showing 12+ volts while performing a quick test/quick clear. Both with the autel and assistplus with no difference.

The faults shown are from the DME. 

Is there a 12v battery adaptation reset or registration that is needed?

I used my autel because it was available to me at the time. I have other scanners if there's something I need to try with the blue box/assist plus or Piwis.

Thanks in advanced all.

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Steven from Spokane

 

Mechanic
 

Our shop has the Autologic Assist Plus, and the few Porsche vehicles I tried it on, I didn't like it. Same thing with Snap-on and Durametric. The only scan tool I trust for Porsche is the factory scan tool. I do use the Durametric for oil change resets, though.

If your Piwis is up to date enough for that vehicle, then that's what I would use. You said the faults that you posted we're from the DME. I don't have any training on that car, but I would assume there are other modules for the hybrid systems, and there should be faults in those modules. Good Luck! 

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Matthew from Lawrence

 

Technician
 

Considering the hybrid battery module is requesting the warning lights on, I would want to know what codes are stored in the hybrid battery module. Was the hybrid system accessed in anyway during the initial work? Could the battery service disconnect or some other hybrid component's connectors not be seated properly? If so the high voltage interlock system would be open preventing the high voltage battery from connecting to the rest of of the system. I don't have any experience with the Porsche hybrid system but with the Toyota/Honda/Ford/GMs ect it's common when the 12-volt system gets low it will set a bunch of codes and prevent the vehicle from starting as a fail safe. Most hybrid systems will need to have these codes cleared before it will go into "Ready".

I bet there is a new battery registration process but I can't imagine that will keep it from going into "Ready". I would also be interested to know what codes are set on the global OBD-II side of the computer.

What parts were replaced for the rear hatch issue? The hybrid battery is in the rear hatch area. Is there evidence of water intrusion back there? Could something have been disturbed or not reconnected? Ground connection? The E-box precharging time too short peaks my interest.

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Steve from Irvine

 

Instructor
 

Going through the little I have. Hope this helps

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