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Discussion Starter #1
I'm driving home from work a few days ago when I see "Service Theft System" come up on the Nav screen. The BRAKE, TCS (off), and ABS lights come on and all start flashing at a seemingly random pace, and the car is bonging at me. I get home (a few blocks away), turn off, and restart. From then on all the lights are still on (Brake/TCS/ABS), but it doesn't bong anymore and the "Service Theft System" doesn't come up. I unplugged the battery and the TCM/PCM fuses for a while, let it reset, and it started all over again when I started the car up. It did it without even moving the car, so I doubt it's a fault speed sensor.

I checked all the speed sensors and the brake fluid level sensor and everything is still plugged in and looks to be alright.

Since it has been doing this, it has disabled the slow-speed power steering assist, so it's kind of a bitch to turn. Does anyone have any input on what's causing this? The car starts/runs just fine, but I can't change the TCS settings and it's a BITCH to turn.

Thanks for the read.

-Casey
 

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2005 CTS-V
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8,363 Posts
I suspect your problem lies in the theft deterrent system. Just reading that particular section of the Service Manual makes my head hurt. I would take it to a dealer, but if you can get it to one of those auto parts stores that will check the DTCs (diagnostic trouble code) with a scanner I can supply the info on whatever DTC you have.
 

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2018 CT6E, old: 2014 XTS Vsport, 2005 CTS-V, 2004 CTS-V.
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Both steering rack and ABS module are low near the front crank pulley. There is also a wiring loom that goes through that area. I'm think damaged harness or maybe bad ground.

Norm
 

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Discussion Starter #4
I have HPTuners, but it isn't throwing the service engine light. I'll check anyway when I get a chance though.

I didn't mention before, but the G-meter will not read anything in either direction. I checked just about every fuse that looked even close to being related and didn't find any blown ones. I will try to do a better check on the wiring harness, maybe pull the intake tube off or something.
 

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Discussion Starter #5
Anyone have any experience with this or heard of this happening before? I really would like to have a better place to aim than the main wiring harness up front lol, especially if I'm not even going to find shit. :lol:
 

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2018 CT6E, old: 2014 XTS Vsport, 2005 CTS-V, 2004 CTS-V.
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The SES will only come on for EPA related codes. Scan with hptuners, clear or delete them as you'll have some in history, and rescan.

Norm
 

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Discussion Starter #7
The SES will only come on for EPA related codes. Scan with hptuners, clear or delete them as you'll have some in history, and rescan.

Norm
Good point, I forgot about the communication errors and such that it can throw. I will check it out tonight. :thumbsup:
 

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Discussion Starter #8
Holllllllllllllllly shit. This thing is having serious issues.... Here's what showed up on the scanner. Anyone have any idea of what this could be. I'm guessing it's probably just one thing wrong that's causing it all, considering it all happened at one time.



 

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CTS-V
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Anyone have any experience with this or heard of this happening before? I really would like to have a better place to aim than the main wiring harness up front lol, especially if I'm not even going to find shit. :lol:
I had the same problem!!:mad: ABS light, traction light, and brake light. Theft system came on the same day, and never came back on. Two days later the steering system service soon light came on, no power steering. :hmm: Took it the the dealership two weeks ago on a Friday morning, they call me about 3 hours later saying its ready! All it was is the ABS module, they replaced it. Haven't had a light go off yet! Knock on wood.
 

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Discussion Starter #10
I finally found it. Ground wire was broken off at the lug. I stripped it, put on a new one, and bolted it back down. The yellow connector is the new connection I had to make.

 

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2018 CT6E, old: 2014 XTS Vsport, 2005 CTS-V, 2004 CTS-V.
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Super! Just a little poking around is all it took. Glad it was a relatively easy fix. :)

Norm
 

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2001 seville sts 219K
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My 2001 STS just started doing the same thing yesterday. I'm going to check the ground wire tonight and see if that's it. Here's the codes I'm getting.
C1295
U1016
U1066
B1328
 

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04' Blown CTS-V 554rwhp 497rwtq
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Holllllllllllllllly shit. This thing is having serious issues.... Here's what showed up on the scanner. Anyone have any idea of what this could be. I'm guessing it's probably just one thing wrong that's causing it all, considering it all happened at one time.



Let us know if those go away when you rescan. I also have HP Tuners and my scans look similar without any PCM faults though. I also have grounding issues and am wondering if they will ever be fixed. (BTW No symptoms at all but I see all those codes)
 

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Mine was a broken ground wire too. On the STS it was the large wire from the engine to the wheel well under the fuse box. The terminal broke off the end of the wire and was making intermittent contact.
 

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04' Blown CTS-V 554rwhp 497rwtq
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Mine was a broken ground wire too. On the STS it was the large wire from the engine to the wheel well under the fuse box. The terminal broke off the end of the wire and was making intermittent contact.
Glad you got it worked out. Now get back to the STS section! :) j/k It seems all models of Caddys have grounding issues.
 
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