2015 Porsche Panamera S E-Hybrid failure

Edward Owner/Technician Middle Village, New York 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 Diagnostician
Brooklyn, New York
Nicholas
   

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.

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Edward Owner/Technician
Middle Village, New York
Edward
 

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 Mobile Technician
Clinton, Utah
Michael
 

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.

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Edward Owner/Technician
Middle Village, New York
Edward
 

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

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Joel Diagnostician
Soquel, California
Joel
   

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 Diagnostician
Brooklyn, New York
Nicholas
   

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.

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Steven Mechanic
Spokane, Washington
Steven
 

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

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Edward Owner/Technician
Middle Village, New York
Edward
   

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

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Steven Mechanic
Spokane, Washington
Steven
 

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

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Matthew Technician
Lawrence, Massachusetts
Matthew
 

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

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Steve Instructor
Irvine, California
Steve
 

Going through the little I have. Hope this helps

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