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Discussion Starter #1
I had the ECM replaced 6 months ago by the dealership due to what they called a communication issue by multiple systems. The symptoms were loss of power, and multiple error messages on the dash (park assist off, traction control off, service stabilitrack). Plus, some of the gauges go flat (rpm, gas). The problem seemed to be fixed, but now I'm having the same problems again. Threw a few codes (U0073/P0700). I'm worried that I'm going to lose power driving down the interstate and smashed by a semi, while I'm transporting my 2 year old. I'm taking it to the dealer again tomorrow, but I'm concerned since they seemed so puzzled by it the first time. Anyone else have any experience with this?
 

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Discussion Starter #3

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Ok the first time I had the Service Stabilitrack / Traction control messages, it was a faulty mass air flow sensor. Cleaning it didn't fix it, a new sensor did, but I wasn't getting the No gauges then so I was thinking Air Bad connector issue. Another thought, My 2008 would get the park assist off message when the truck was in drive and the park brake was engaged. Also i got the stabillitrack message if the brake fluid was low, check your level. The U0073 code is interesting. It could be a loose connection or a bad ground. Was ANY other work done on it since the ECM was replaced?
 

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Ok the first time I had the Service Stabilitrack / Traction control messages, it was a faulty mass air flow sensor. Cleaning it didn't fix it, a new sensor did, but I wasn't getting the No gauges then so I was thinking Air Bad connector issue. Another thought, My 2008 would get the park assist off message when the truck was in drive and the park brake was engaged. Also i got the stabillitrack message if the brake fluid was low, check your level. The U0073 code is interesting. It could be a loose connection or a bad ground. Was ANY other work done on it since the ECM was replaced?
No, nothing has been done since the ECM was replaced. Today they said they think it could be the TCM, but they can't reproduce the problem in order to test it. I think it's odd that the problem went away for 6 mos after the ECM was replaced.
 

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Same Issue with Engine Light on

I am experiencing the same thing with my 2012 Enclave. The traction control and engine lights came on at the same time yesterday and the codes it threw were for emission control issues. Took my car into the shop first thing this AM and they tell me I have a fuel injector not firing. $600 later they have that replaced but the ECM is still not resting so telling me that maybe it's fried and they have to keep it another day to see if they can have it flashed and reset it...…. I just hit 96K miles and 3 months ago had to replace the water pump on this thing. Feel like I am getting the run around for a lot of cash because I see a lot of other people have these exact same issues with their enclave. What really is the issue???
 

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Interesting. If you had a injector which wasn't firing, I would think that you would have had a misfire code. Did you get a Check Engine Light as well?
 

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Traction Service/U0073

Exactly same issue for 2011 Enclave CXL 2WD, 126000 km: Traction Service/ Stabilitrak Service Light blink and Engine Light On while Engine RPM drop down. It could be at any RPM: if it is low RPM, the engine will be dead, power steering stop, engine light on, the electrical is ok, battery voltage never change, the solution is to restart, then the engine light will be off and everything looks normal ; if it is high RPM, the RPM will drop hundreds to thousand RPM, Traction Service/Stabilitrak Service light is blink while RPM drop down, then RPM raise back up, Engine Light off and Service light off as well. Nothing changed no matter I select Traction Service off or on. And the error code is U0073.

Left the car in dealer for 4 weeks, they changed throttle body, tested air flow sensor (they said it was replaced but changed back since it was not the reason), and checked all connection. Finally they suggested me to replace ECM module but they are not sure it is the reason or not.

The other problem for this machine is battery leaking: the battery would be up if the car no move for 2 days. The battery has been replace twice in 3 years. Both from Costco. The latest was in winter 2018-2019. Now it is summer but the battery still can't last for 2 days without moving the car. It seems I have to pull out couple of fused to critically reduce the leaking current, and the current changes. Since I don't have the circuit schematics, it is very hard to tell where the problem is. ECM could be one of the possibility.

I can understand the machine has some problem after so many years running. What I got confused is, if the problem is apparently above the dealer technician's ability or access right, how is GM going to do. I was told PCM, ECM those modules are control the machine, and program need to be loaded, that is telling me there is chance to, at least, minimize the possibility by monitoring the input/output signal timing. Also, since PCM or ECM module problem has been concerned, why GM can't prove it firstly by replacing the module. I wouldn't question nothing if they proved it is problem firstly. But right now, I need to pay 1000 CAD firstly before they confirm the problem. And that is the best deal I can get in Toronto area, some dealer even told me 1500 CAD to replace. Why GM don't make a specialist service team just deal the cases which normal dealer can't take care?

Again, machine is supposed to have problem after years running, but it drive me crazy that I don't know how much I need to pay and how long it will take to fix it. As an automation control engineer in machine builder, I believe there is better way to find out where the problem is.

Enclave is a good car, my wife is still trying to compare all other brands (Subaru, Toyota, Ford etc) with her Enclave when we are shopping our next car. But I still will get rid of it for safety reason.
 

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Well, they replaced the battery and that didn't fix the issue. Took it back and they still cant figure it out. Buick has been no help. This is a big safety issue and someone will get hurt if they haven't already. I guess I'll trade in the vehicle and pass the problem on. I used to be a GMC fan, but I'll never buy their product again. Shame on you Buick/GMC. People dont deserve to be treated this way.
 

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By any chance do you have articulating headlights with any water in them? Our 2008 had the same problem (even door locks would try to lock when driving) due to a communications error on the buss- turned out to be a cracked headlight that got water inside from a car wash. Totally randomly, the unit would short out and cause the problems. I thought the dealer was full of it, but the tech was right.
 

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By any chance do you have articulating headlights with any water in them? Our 2008 had the same problem (even door locks would try to lock when driving) due to a communications error on the buss- turned out to be a cracked headlight that got water inside from a car wash. Totally randomly, the unit would short out and cause the problems. I thought the dealer was full of it, but the tech was right.
Great that they found the problem. I looks like you have a good dealer there, the mechanic took the time to properly diagnose the problem. You never know what electrical/electronic issue arises from a totally unrelated cause.
 
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