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2012 LT Litany of Problems, Started Stalling, Now Dead/Won't Start

9247 Views 33 Replies 11 Participants Last post by  ChevyGuy
We have a 2012 LT, purchased from Hertz in June with about 53k miles on it, now has about 62k. Long story short, we’ve had various warning lights, etc. go off, had a bit of fluctuation at idle, then lately started to stall when sometimes in idle, and finally the battery was dead when going to start it a couple mornings ago. As for the long version:

A couple months ago, the check engine light went on. Noticed some very slight RPM fluctuations at idle. Took it to AutoZone to have the code read, came up with something similar to my truck related to the MAF sensor…bought some cleaner, but didn’t really do much more checking into it. A couple days later, we had the coolant light go off. It stopped blowing hot air, and eventually started to overheat. We put some DexCool in, brought it to a shop who basically guessed that it had a bad thermostat. They also said that about eight codes came up. Ordered the part, and while waiting, started driving it a little and it never overheated again, so the part went back.

Started noticing that the fluctuations at idle were getting a little more pronounced…nothing as severe as what I’ve seen in some YouTube videos, but enough where we were just a tad concerned that it would stall after one of them. Then had the TPMS light go off…but after checking, nothing was wrong with the air pressure. Went along like this for a couple weeks, then other random notifications would come on, like the power steering and StabiliTrak lights. Then the radio would start cutting out and the headlights would flicker at the same time while driving on a few occasions.

Then about a week ago, went on a couple-hour cruise at night, with the fluctuations at idle getting a little wilder. Radio cut out a couple times on this drive. When we pulled up at home and put it in park, the car died. Happened again when parking after a normal half-hour or so drive. A couple days later, died at idle while waiting at a red light. And finally, it was completely dead when going to start it a couple days ago.

Do these symptoms sound the same or similar for anyone? Thanks!
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Glad to hear they're takin care of you.

I wonder if that was why my car kept eating batteries...though I have never had any other electrical problems.
The only disappointing thing to hear from the advisor was that she said that, even though I called and initially brought up the symptoms and the special coverage, she didn't want to put any of that on the initial filing and instead just start with saying I brought it in for a battery check. She said that even though the special coverages are able to be seen by the public, GM more often than not denies the claim if it's mentioned from the outset. Wasn't too pleased to hear that...but glad she was honest with me.
Things that make you go "hmmmm". I think I can understand not referencing the coverage (as someone will say "free work!" and bring it in.) But I'd think they'd be OK with putting some symptoms on the initial filing to show that it was to fix an issue. They'd just leave off the stuff that showed you knew about the bulletin. At least that's what I'd think..... (That and $5 will get you coffee.)
Well, this is a bit disappointing so far. Picked up the car today...the advisor I'd been working with went home sick, so someone else who had no clue about my car signed me off and sent me on my merry way. The receipt says that they replaced the negative battery cable per the special policy (they said the battery was good, so they recharged it), completed a multi-point vehicle inspection, and per the recall, inspected my coolant level and refilled. As for the last part, doesn't seem like that's recall work, but I'm open to being corrected.

So I get in the car, start it, and what do we have...the check engine light still on. Great. So I get to a stop light...minor fluctuation at idle. Even better. So I go to AutoZone to return the battery I bought in case it was needed and have them run the codes...they came back with P1101, P0171, and P0106. Does this mean that my initial problem might not have been related to the cable? And even if so, how can they write that they completed an inspection and not mention anything about codes coming up?

Hoping this doesn't become a nightmare...
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MAP, MAF, and a lean code. Sounds like they didn't fully connect an air hose. Or there's a leak somewhere.

I went to pick up a car once with the CEL on. The service advisor didn't like me very much after that.
Hoping this doesn't become a nightmare...
It might if you don't find a competent service department.
Well...third time starting it, and what greets me? Service StabiliTrak and service traction control...here we go...
Maybe they never replaced the cable...or got confused and put the old one back on instead of the new one.
The p0171 code also comes up when you have a bad pcv valve (covered under powertrain). I have 13 1.4t and my negative battery cable went bad at 50,0xx miles and within 100 miles my pcv valve went bad. I'm not sure if in any way these are related or if it happens like that for most other people too. It might be worth looking into.



ALSO, when my PCV valve was replaced the dealer broke a coil boot. I got very similar issues like what you're experiencing. Stabilitrak, CEL, and traction control lights came on. However, i also experienced engine stutter.
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Both of those usually come on in conjunction with the Check Engine light.
Well, this is a bit disappointing so far. Picked up the car today...the advisor I'd been working with went home sick, so someone else who had no clue about my car signed me off and sent me on my merry way. The receipt says that they replaced the negative battery cable per the special policy (they said the battery was good, so they recharged it), completed a multi-point vehicle inspection, and per the recall, inspected my coolant level and refilled. As for the last part, doesn't seem like that's recall work, but I'm open to being corrected.

So I get in the car, start it, and what do we have...the check engine light still on. Great. So I get to a stop light...minor fluctuation at idle. Even better. So I go to AutoZone to return the battery I bought in case it was needed and have them run the codes...they came back with P1101, P0171, and P0106. Does this mean that my initial problem might not have been related to the cable? And even if so, how can they write that they completed an inspection and not mention anything about codes coming up?

Hoping this doesn't become a nightmare...
Should you ever have this lamp come on after picking your car again, turn around and give them the car back for repair (again)
Right now, all they know is you are gone and your car is repaired.

You should be at the door, when they open Monday morning, with the full expectation of a loaner.......be annoyed....you have the right.

Rob
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What's wrong with the negative battery cable anyway? On mine, only about a foot long, terminal bolt is crap, replaced that. Now just looked at the other end that goes to a junction point, bare copper wire in a ring terminal. That copper is turning brown, copper oxide that is a great insulator.

Another chore, remove both cables, wire brush those terminals and dip in a hot soldering pot.

This how we used to do this, saving another couple of cents to lay out a lot more for warranty repairs. Mine lasted through warranty.
What's wrong with the negative battery cable anyway? On mine, only about a foot long, terminal bolt is crap, replaced that. Now just looked at the other end that goes to a junction point, bare copper wire in a ring terminal. That copper is turning brown, copper oxide that is a great insulator.

Another chore, remove both cables, wire brush those terminals and dip in a hot soldering pot.

This how we used to do this, saving another couple of cents to lay out a lot more for warranty repairs. Mine lasted through warranty.
Supposed to be a bad crimp causing the issues.
Should you ever have this lamp come on after picking your car again, turn around and give them the car back for repair (again)
Right now, all they know is you are gone and your car is repaired.

You should be at the door, when they open Monday morning, with the full expectation of a loaner.......be annoyed....you have the right.

Rob
Well, I brought it in yesterday morning, spoke to the advisor about what had happened, and she basically told me that she could have the guys recheck the work, but the special coverage does not cover the CEL, so that's not something they would have even looked at when it was taken in (unless I paid the diagnostic fee). So even though the service StabiliTrak/traction control notifications came up (only once over the weekend), unless they came up while they looked at it, they couldn't do anything further about it.

I guess that makes some sense to me, even though some acknowledgement of the CEL and my options from that point on upon pickup would have been nice. So I guess I just have to decide whether I want to use that dealer again for the diagnostic, or look elsewhere...
For whatever reason and don't ask me why, when many codes are set, they stay set, regardless of the cause that set them in the first place.

My friendly Chevy dealer that made a couple bucks off of me wanted 30 bucks to just reset the codes. Agreed to it with my just out of warranty 04 Cavalier, but the only guy that knew how to plug the scanner in just left. So I drove up a block to Advanced Auto and the reset the code for free.

This darn thing has the carbon canister mounted low and behind the fuel tank. With slush on the road, gets wet and freezes up the purge valve so a code is set. After it thaws out, its okay again, but that stupid CEL is still on. Cruze is the same way. Try Advanced, Autozone, O'Reilly's. They will tell you the code and reset it for free.

But if it comes back, then you have problems.
For whatever reason and don't ask me why, when many codes are set, they stay set, regardless of the cause that set them in the first place.
For awhile. But if it never re-occurs, it will clear itself after so many cycles.
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