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2006 STS-V
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819 Posts
Discussion Starter #1
Hey folks. Been a while since I've been around....hope you are all well. I drove to work this morning and everything was fine. I put the car in Park and went to turn it off and it told me the car was not in Park...but it was. And then it said that I was in Accessory mode even though I wasn't. And I think one of the lights on the key button on the dash was red which I don't ever recall seeing. I restarted the car, backed up and pulled back into my space and the same thing happened. So, I made sure to turn everything off and went into my office. I came out at 2 and the car was dead. I got it jumped and got it started. The CEL was on...it felt very sluggish when driving, the supercharger would not engage, the radio lights were on but no audio, no clicking when the turn signal was on..... So, I drove the 3 miles to the dealer and told them they had a car to work on..they gave me an SRX and I was out in 20 minutes.

Any ideas what is going on here????
 

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2006 STS-V
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819 Posts
Discussion Starter #3
Interesting. The tranny did feel sluggish too. Nuthin on the screen though....should it have shown up?
 

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2015 BMUU 335i MSport, 2006 STS-V--2005 CTS-V ( traded in)
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25,514 Posts
From the sound of things (other posters) I'm about ready to put mine in and have them check the Xmission fluid level, I'm at 23K+ miles. (might be a good 25K check)
 

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2006 STS-V; TopKart Flash 125 Shifter
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161 Posts
The battery is dying. Transfluid is fine unless someone touched it.

That would be my first bet also. Second is a bad ground connection somewhere. As soon as the voltage drops in the wiring harness, the various CPU's start misinterpreting the signals and things get wacky fast.
 

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Cadillac
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746 Posts
MY PCM had to be replaced a few months ago because of some wacky chit going on... I bet yours is fried too.
 

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2009 CTS-V
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816 Posts
I had an identical problem when I purchased my 2006 last year.

I had a friend with a shop scan the computer and got some transmission related codes. Went to a wedding that night, parked and again the accessories/center screen stayed lit. Came out afterwards and the battery was dead.

Got a jump and managed to drive home. During the drive home the car was sluggish and was driving a little funky. No doubt a result of the battery voltage still being low. By the time I got home the car was driving normally. When I parked it that night, everything turned off normally and I've never had the problem (or any computer codes) in the 9 months since.

Very strange.
 

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06 STS-V, 08 STS-V, 14 Raptor, 12 Camaro SS, 08 FJ
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1,777 Posts
I had it happen on my 06 but I thought it was because I was trying to get HPTuners to sync up for the first time. I reset the PCM by pulling the battery cable and it went away and hasn't happened since. So maybe your battery dying took enough voltage off the PCM to reset it.
 

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STS-V
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393 Posts
The PARK thing happened to me. It was the switch on the gear shift selector that relays the position to the computer about what gear the car is in. In my case, the car would not turn off! Told me it wasn't in park, and would not let me turn it off. Just before that, the transmission would act funky - not shift gears properly, not go above 3rd gear, all kinds of weird things. They initieally just tried to reset the PCM & ECU, which corrected it temporarily, but the problem came back 3 to 4 weeks later. Ended up replacing the switches/sensors in the console and again resetting the PCM & ECU. Had to do a transmission relearn procedure, but has been fine ever since (18 months or so). Hope that helps.

Bob
 

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2006 STS-V
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819 Posts
Discussion Starter #13
Well, they charged the battery Friday afternoon and got a full charge on it. They ran diagnostics on it and said the battery was fine. They kept it overnight and tested it cold on Saturday morning. Everything was fine. He told me to pick it up and they would leave the ticket open in case anything else happened. I drove it over the weekend and today and all was well. I wonder what could have caused the issue of the battery is fine..... By the way, I'm pretty sure this is my second battery.....
 

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2015 BMUU 335i MSport, 2006 STS-V--2005 CTS-V ( traded in)
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Well if it is a battery related issue perhaps I will be spared from it. :)


thefred, roughly how old is the current battery ?
 

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2006 STS-V; TopKart Flash 125 Shifter
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161 Posts
The fact that a battery "holds a charge just fine" doesn't mean you're good. I admit that this is just a theory of mine, but your CPU depends on a STABLE current in order to function correctly. This includes getting good info from the sensors as well as the power supply to the CPU itself. The battery acts as a power sink and defacto surge protector, absorbing voltage spikes and smoothing the current. Once the cells start to deteriorate, they no longer can perform that function, even if they still can hold plenty of current to perform the more traditional job of cranking the starter.

I had a BMW 750 that would act up ever 3.5 years, almost on schedule. The car would go into limp mode, etc. Changing the battery fixed it every time. I even traded correspondence with owners who had spent hundreds of dollars chasing phantom problems caused by the diagnostic software going wacky. Changing the battery solved their problems too. Don't know if this will translate over to the Cadillac (it hasn't to my Buick).
 

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The fact that a battery "holds a charge just fine" doesn't mean you're good. I admit that this is just a theory of mine, but your CPU depends on a STABLE current in order to function correctly. This includes getting good info from the sensors as well as the power supply to the CPU itself. The battery acts as a power sink and defacto surge protector, absorbing voltage spikes and smoothing the current. Once the cells start to deteriorate, they no longer can perform that function, even if they still can hold plenty of current to perform the more traditional job of cranking the starter.
Tru Dat
 

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2006 STS-V
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819 Posts
Discussion Starter #18
I really can't remember when I changed out the battery, but its likely a year or more ago. If I recall correctly, the dealer did it for free. All has been well with no issues since last week when I got the car back. But, I have a feeling that its probably a battery going bad issue. My service guy even said "if you get two years out of a battery, you did well." I'm sure he was speaking about the ones GM supplies....
 

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2015 BMUU 335i MSport, 2006 STS-V--2005 CTS-V ( traded in)
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25,514 Posts
Yeah I didn't wait after my battery reached roughly two years of age (two years seems to be fairly common on the AC Delco type 100) , I went ahead myself and swapped it with a RedTop.
 

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2006 STS-V
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819 Posts
Discussion Starter #20
I remember there being an issue with fitment on the optimas. Is there one that fits with no modification required?
 
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