PCM won’t turn on

Audio, Navigation, Electronic Issues and Fixes
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giqidiri
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Joined: Tue Feb 22, 2022 9:54 am

Post by giqidiri »

Hello I have a 2015 macan turbo with 92k miles that I barely drive any more. I live in northeast where it’s been cold and over the weekend I drove to the gas station. On the way home when I turned on the car I got an alert saying low battery - leave running for extended time. The PCM was black/off and despite driving home and then driving for an hour and a half today it still won’t turn on.
Long story short: battery has never been replaced. Do you think pcm not working due to low battery or is something else wrong like a fuse. I haven’t gotten the low battery warning since that one time and the car is running fine. Thanks!
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pmg
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Post by pmg »

Look at voltage in MFD if below 12 then likely battery issue.
2019 Macan S Porsche code PKW8WKI8
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Percymon
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Joined: Mon Sep 20, 2021 11:41 am

Post by Percymon »

at 7 years old and limited recent use i suspect the battery is ready for the graveyard - you could try a recondition cycle if you have a suitable CTEK charger, but more likely it'll need a new battery which has to be coded into the car.
Col Lamb
Posts: 9323
Joined: Fri Oct 30, 2015 8:38 pm
Location: Lancashire

Post by Col Lamb »

Mine was laid up for a couple of months when I had an Op and the battery went flat.

The Porsche Assist started the car but it needed to go to the OPC to have the system reset
Col
Macan Turbo
Air, 20” wheels, ACC, Pano, SurCam, 14w, LEDs, PS+, Int Light Pack, Heated seats and Steering, spare wheel, SC, Privacy glass, PDK gear, SD mirrors, Met Black, rear airbags
On-Track
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Joined: Sun May 03, 2015 12:59 pm
Location: Staffordshire

Post by On-Track »

Do you have any of the other functions, such as "Stop/Start", Comfort Access and Coasting? Given the low battery warning I would expect all of those to be paused. As the battery voltage drops, the management system will ditch virtually all systems one by one in order to retain the ability to start the car.

As has already been said, try a reconditioning cycle with a CTEK or similar charger if you can.
Peter

Current: 2020 Carmine Red GTS http://www.porsche-code.com/PMST9ZI9
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