Check Engine Light, PSM Failure, Sputtering
Thread Starter
AutoX
Joined: Jul 2018
Posts: 11
Likes: 4
From: Alpharetta, GA
Check Engine Light, PSM Failure, Sputtering
I experienced a very strange thing today with my 997.2 PDK turbo. I drove to a store about 10 miles from my house...no issues. When I left the store to return home, I pulled out of the parking lot and almost immediately I had to stop at a red light. While sitting at the light the car bagan to idle very rough. At first I thought it might just be some bad gas in the system. When the light turned green I tried to accelerate, but the car sputtered and shook like the transmission was slipping. Then the PSM light came on, check engine light flashed, and the PSM Failure message popped up. I couldn’t get the car to go any faster than 25 mph as it shook its way into another parking lot where it quickly shut it off. I also noticed a burning smell like clutch or brakes. I called the dealer and after about 10 minutes I restarted the car and the warning lights were no longer illustrated. They informed me that if the warning lights were out it was ok to drive it to the dealership for diagnosis. It drove fine all the way to the dealership, even at 70 mph on the highway. This all occurred Saturday afternoon, so I won’t hear anything from the dealership until Monday at the earliest. Has anyone experienced this? Is this an engine or transmission issue, or neither. Any insight would be appreciated.
Three Wheelin'
Joined: Mar 2012
Posts: 1,738
Likes: 161
From: Northern Virginia
I experienced exactly the same thing at 65K miles (PSM, TPMS, limp mode, check engine light) with my 2011 Cayenne TT with PSM several weeks ago. I too pulled over ASAP, shut down, let the CTT sit, restarted, everything cleared and my CTT drove normally. Have you been getting an occasional PSM warning light that would flash for a few seconds on dry roads and then go away? I am. I haven't experienced the same conditions since but it's going to the dealer soon and I'll post the results.
BTW, when I was in Asheville, NC recently I stopped by the Porsche dealer to look at their shop as I'm considering moving there. I explained the condition to the service manager but unfortunately I can't recall what he told me (should have written it down, but it was two ?? non-wear and tear suspension parts). I do recall them saying it's safe to drive and it's not coil packs.
BTW, when I was in Asheville, NC recently I stopped by the Porsche dealer to look at their shop as I'm considering moving there. I explained the condition to the service manager but unfortunately I can't recall what he told me (should have written it down, but it was two ?? non-wear and tear suspension parts). I do recall them saying it's safe to drive and it's not coil packs.
Last edited by 4ocious; Sep 17, 2018 at 08:33 AM.
Thread Starter
AutoX
Joined: Jul 2018
Posts: 11
Likes: 4
From: Alpharetta, GA
Thanks for the feedback. The part that concerned me the most was the shaking, shuttering and complete lack of power. The smell was concerning too. I’ll be sure to post what the dealer finds. I’m the second owner, so thankfully it’s still under CPO warranty.
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Three Wheelin'
Joined: Mar 2012
Posts: 1,738
Likes: 161
From: Northern Virginia
Thanks for posting, Interesting, this isn't what the Porsche dealer in Asheville said. He related it to a suspension issue. Now it's my turn to find out. And I'm still getting the intermittent PSM light.
4th Gear
Joined: Apr 2020
Posts: 4
Likes: 0
From: Viborg, Denmark
Did you get the problem fixed? im dealing with the exact same problems that you had, Idle rough, not firing on all cylinders, PSM light came on, engine light flashing etc.
All help would be appreciated.
Best regards Martin
All help would be appreciated.
Best regards Martin
5th Gear
Joined: Jan 2020
Posts: 5
Likes: 0
Sure did! I replaced all the ignition packs and it went away. I did the plugs the year before so I knew it wasn't them. I don't think it had anything to do with the MAP sensor and I didn't need to replace that. If the light is flashing that means its misfiring.
4th Gear
Joined: Apr 2020
Posts: 4
Likes: 0
From: Viborg, Denmark
I replaced all 8 coils and plugs aswell, even the 2 camshaft solenoids, still having misfire on several cylinders, i can feel it when the misfire starts, then the lights starts flashing straight away.. Its killing me! 
Need to read all the posts and keep looking for a sollution..
Thanks for the quick reply Normnyc
Need to read all the posts and keep looking for a sollution.. Thanks for the quick reply Normnyc
5th Gear
Joined: Jan 2020
Posts: 5
Likes: 0
Oh okay, yeah that sounds like a different issue if it happens right away as mine was more sporadic. I would take it to the dealer and have them scan it with the Porsche scanner. It sounds like you are getting close though if you replaced all that. If you used parts that weren't new they could be faulty too.
Good luck! Post the answer in here when you find out what it was.
Good luck! Post the answer in here when you find out what it was.
8th Gear
Joined: Dec 2020
Posts: 8
Likes: 2
From: Northern Virginia
Hey my Porsche 991.2 turbo is going in the shop tomorrow for similar issue. At about 3200-4000 RPM under hard throttle the engine would sputter and choke kinda - PSM warning - engine warning etc. came on and then off when car was turned off and restarted.
Can you confirm these were your symptoms - and if so, did Porsche warranty cover all of it or what?
Can you confirm these were your symptoms - and if so, did Porsche warranty cover all of it or what?