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CT5-V STABILITRAK PROBLEM

CT5-V Model

Daniel Goss

Member
Joined
Aug 28, 2025
Messages
10
Location
East Texas
V-Series Cadillac(s)?
2025 CT5V Blackwing
My 2025 CT5 BW only has 322 miles. This afternoon while sitting at a traffic light, the engine started running rough and the check engine light came on. At the same time the SablilTrak inoperative warning light came on. I have made an online appointment at the local dealer for Tuesday, and I am trying to be optimistic about a quick fix. In the meantime, here I am asking if anyone has experienced this issue.
 
My 25's exhaust flapper valves somehow become unplugged which triggered a code. No other issues than that other than the oil plug press in.

Production was in December 2024.
 
Had injector bad on different chevy do the same thing with the same lights.
MY26 engine light was on and off 4 times from few hundred miles until 800 miles, dealer replaced injectors, fuel rail on one side of motor and bled the intercooler system, has been fine 1200 miles since.
 
My default for rando behavior is a flat battery. Does it sit around a lot or did you just take delivery? Either way if its not on a maintainer its possible the battery is barely charged enough.
 
Regarding battery, I just bought the car new about 3 months ago, so with just 322 miles, it is obvious that I haven't been driving it a lot. But when it is just sitting in the garage it is hooked up to a battery maintainer, which shows "fully charged - auto maintaining".
 
I guess it could still be a bad cell, but I guess you'll get a clue tomorrow at your appointment.
 
Sounds like it could be a bad injector like Comment 2 mentioned - that combo of rough idle and stabilitrak error is pretty common when the engine isn't running smooth.
 
Just heard from the dealership. Yes, a bad #7 injector is causing the roughness which is preventing the function of the StabilTrak system and Auto Hold. But the service advisor had other news I didn't like. While letting the car idle the tech notice a strange sound coming from the transmission, he thinks it may be in the area of the front pump. He is first going to see what can be determined by just dropping the pan, instead of removing the transmission.
 
For any who may care for an update. Here is my story, and I am sticking to it. I have had several new vehicles in my 63 years of driving, along with my share of recalls and minor warranty issues. But this one really surprised me. The initial symptoms are described in my first post, and the culprit was found to be a problem in the wiring harness going to the injectors, a relatively quick fix. However while the mechanic was diagnosing this he heard an abnormal sound coming from the automatic transmission. It turned out to be from a defective idler gear, and when he examined the fluid, he found brass grit. And this with just over 300 miles from new. The only fix the dealer was happy with was a complete transmission replacement. That was done and I picked up the car yesterday. Just drove it home and parked it in the garage, so it will be next weekend before I can drive it enough to satisfy myself that all is now normal. But, so far I applaud the dealership for going this route in lieu of just replacing parts and a fluid flush.
 

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