08-10-2019, 10:53 PM | #1 |
Drives: NGM 2018 2SS Convertible Join Date: Sep 2018
Location: DFW
Posts: 21
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Shift to Park error among other things
OK, literally just received my new to me 2018 1SS convertible today. FIL has had it to his local dealer for inspection and other items and been driving it daily to work out any possible kinks while we were on family vacation. Worst problem was a leaking valve stem on one tire. So he brought it into town this afternoon on a 250 freeway cruise. Joy! Took each of the boys for a quick ride and all is good so far.
About 2 miles from home made a sweeping left turn between 30-35 and after I come out of the turn the tach, speedo, and dash cluster goes dead and car goes into limp mode. Then a Stabilitrak service message pops up on the DIC. I dismiss it because, what else am I gonna do for it at this point, and then everything comes back to life. Already on the final stretch home, so we're just going in. A mile later I make a stop at an intersection and after I go through it the dash goes dead again and back into limp mode. Nothing is happening after that and not knowing what the limits of this mode are, I pull into a parking lot and decide to shut it down since I know I'm not in the road. After that big turn it has been nothing but gentle curves in the road, nothing more than 20 degrees either way. So while I might get turning causing a short somewhere, there wasn't anything really similar at the instances when it went into safety mode. Kinda perplexed on what triggered it. Well, that was the last time she ran. Persistent Stabilitrak service required messages and now Action Required:Shift to Park. No matter what I do, I cannot get it to resolve, so there's no starting it. Weird shut down sequence needed to shut it completely down and not stay in ACC mode, trunk won't open with the door button or remote. Oddities like it honks like the key is inside when shutting the door, etc. Luckily I was able to get the top back up, but when shutting the door it might take the window 30 sec's before it decides to fully roll up after the door is shut. The parking brake service light is always displayed when it's turned on. The check engine light stays on always as far as I can tell. Couldn't get to the battery to disconnect it because the manual trunk key extender is nowhere to be found, so no attempt to reset the computers. Finally got roadside assistance to dispatch a flatbed to take it the 3 miles to my local dealer. So no major inconveniences, just lots of question marks. Like: Possible that the slowly-becoming-infamous shifter sensor problem is throwing up other error codes and manifesting in all sorts of symptoms? Hoping that a simple shifter assembly R&R will cure the majority of this, honestly. Or am I in for a long series of diagnostics, repairs, and headaches? Any Ideas/Tips/Suggestions/Sympathy? |
10-22-2020, 05:25 PM | #2 | |
Drives: 2016 Camaro SS Join Date: Sep 2018
Location: Bartlett, TN
Posts: 1,121
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10-30-2020, 09:42 PM | #3 | |
Thank you Al Oppenheiser!
Drives: Red Hot A10 ZL1 Convertible Join Date: Jun 2017
Location: Sarasota, FL
Posts: 4,965
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These cars really do not like low voltage. The various computer modules get all kinds of wonky and lose their minds when they suffer low voltages.
OP's issue was likely an intermittent main 12v electrical open (loose battery connection, fuse, rat-chewed wire, loose connection, etc.). Quote:
The car will be in park and you still get the "shift to park" error <-- TCU losing its mind. Happened to me today after a dead battery. I connected the jumper cables to power the car, key to ON. The car also threw a CEL and a few codes including a TCM error (I presume related to the TCU not knowing that the car was in park). I let it charge up for several minutes off the running jumper car, and I cleared the codes, let it charge up several minutes more. 20-30 min total was required to get enough charge into the 3yr old OEM AGM to allow the car to start. When I finally started her up the "shift to park" error went away. The CEL did came back on again and I cleared codes again. Was fine after that. |
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10-30-2020, 09:51 PM | #4 | |
Drives: 2016 Camaro SS Join Date: Sep 2018
Location: Bartlett, TN
Posts: 1,121
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Sent from my SM-N986U using Tapatalk |
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11-02-2020, 10:24 AM | #5 | |
Drives: 2019 SS Join Date: Nov 2019
Location: Michigan
Posts: 91
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11-02-2020, 10:36 AM | #6 | |
Drives: 2016 Camaro SS Join Date: Sep 2018
Location: Bartlett, TN
Posts: 1,121
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11-02-2020, 11:12 AM | #7 | |
Drives: 2019 SS Join Date: Nov 2019
Location: Michigan
Posts: 91
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So either GM made a change to the TCM, the connector was incorrectly wired, or someone else had worked on this car previously (I am the second owner). So this would be crazy if it solved your problem as well, but short of a wiring problem in between the TCM and the power steering control module, this sounds similar to my issue. |
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11-02-2020, 11:18 AM | #8 | |
Drives: 2016 Camaro SS Join Date: Sep 2018
Location: Bartlett, TN
Posts: 1,121
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Wow that is crazy sounding. When we ordered the TCM we gave the dealer the VIN to the car so I am assuming we have the correct one? I have the A8 so not sure if it is the same on mine as yours but I will definitely send this over to my mechanic, at this point any ideas are welcome. |
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08-23-2022, 08:49 PM | #9 |
Drives: Camaro SS 17 Join Date: Aug 2022
Location: Long Beach
Posts: 3
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What was your solution? Literally have the same exact problem and the dealer can’t figure it out.
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08-24-2022, 01:07 PM | #10 |
Drives: 2016 Camaro SS Join Date: Sep 2018
Location: Bartlett, TN
Posts: 1,121
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