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Discussion Starter · #1 ·
Hi all - I just noticed the AC wasn't working on my 2017 Acadia V6. The temp gauge doesn't appear to be working as well - and I saw a message on the DIC about power steering assist not enabled. Hooked up OBDII and saw a P0128 code. Based on everything I've read, this could possibly be a thermostat or a ECT sensor. I can't seem to find the location of either of those parts - can someone point me to where the ECT sensor and thermostat are on the 2017 model. Thanks in advance...
 

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I did. I replaced my thermostat about a month ago and my problems went away. This seems to have fixed it. Replacing the thermostat was a difficult task and took me about 4 hours, but you can do it. You need to remove the items off the top of the engine, like the air intake and even the fuel rail, then the thermostat is under that. The thermostat is about a $150 part because you get the housing and pipe with it.
 

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Discussion Starter · #5 ·
I did. I replaced my thermostat about a month ago and my problems went away. This seems to have fixed it. Replacing the thermostat was a difficult task and took me about 4 hours, but you can do it. You need to remove the items off the top of the engine, like the air intake and even the fuel rail, then the thermostat is under that. The thermostat is about a $150 part because you get the housing and pipe with it.
Thanks for the info. Did you flush air out of the radiator/coolant system after? If so, how?
 

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I did not need to. I just refilled the overflow bottle a little past the full line and started the engine and let it idle for a while. It circulated the coolant and I had to add a little more in, but not much. Just keep an eye on the level over the next few times of driving it and if the level stays full, you should be fine.
 

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This week I had the same problem with the steering assist code, engine light and the car was roaring at startup.They replaced the thermostat and it works fine. They said the steering assist goes through some of the same modules so that is why it showed up but nothing was wrong with the steering.
 

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This week I had the same problem with the steering assist code, engine light and the car was roaring at startup.They replaced the thermostat and it works fine. They said the steering assist goes through some of the same modules so that is why it showed up but nothing was wrong with the steering.
Has been happening off and on also. I take it to dealer they do something to the software, since they can’t find any codes wrong with it. Problem comes back in 3-4 months. This has happened twice before, BUT now I’m getting ’service the engine’ light also 😏
 

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2017 Acadia SLT-1 AWD 3.6 v6 LGX Silver
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I had the same issue after working under the hood, changing the oil and filters. I simply reseated the connector to the ETC sensor and the code went away. I wiped off the terminals and blew them out with an air compressor. Maybe it came lose or collected too much dust. Definitely check your connection before spending lots on parts and labor. The sensor itself is less than $10 and pretty easy to get to. I haven't touched my thermostat yet.
 

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I had the same issue after working under the hood, changing the oil and filters. I simply reseated the connector to the ETC sensor and the code went away. I wiped off the terminals and blew them out with an air compressor. Maybe it came lose or collected too much dust. Definitely check your connection before spending lots on parts and labor. The sensor itself is less than $10 and pretty easy to get to. I haven't touched my thermostat yet.
Where did you find the ect?
 

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Hi all - I just noticed the AC wasn't working on my 2017 Acadia V6. The temp gauge doesn't appear to be working as well - and I saw a message on the DIC about power steering assist not enabled. Hooked up OBDII and saw a P0128 code. Based on everything I've read, this could possibly be a thermostat or a ECT sensor. I can't seem to find the location of either of those parts - can someone point me to where the ECT sensor and thermostat are on the 2017 model. Thanks in advance...
I am having the same issue on my 2017.
 

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This week I had the same problem with the steering assist code, engine light and the car was roaring at startup.They replaced the thermostat and it works fine. They said the steering assist goes through some of the same modules so that is why it showed up but nothing was wrong with the steering.
Did you take to a dealership? I’m having the same issue but it’s no longer covered under warranty and they quoted me $900 to replace..
 

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My update, I had a great mechanic change my sensor, with 1.5 hours of labour. The dealership has it as 4.5 hours. It wasn't the problem, so now I will get him to change the thermostat. The dealer told me that the thermostat regulates the flow to the sensor, making the sensor seem to malfunction. Might be worth changing both at once for everyone else who has this issue.
 

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I have a 2019 Acadia SLT-1 V6. I keep getting the steering assist code and my fans run high and my AC blows hot. I had my car at a dealership (one that I dont normally use) for another reason that I am not paying for and they informed me while they were already diagnosing my car for another issue caused by a accident. They told me that I need to replace my thermostat and quoted me $725. I called the dealership I normally use and they quoted me to replace thermostat $515 and change out the door. I know the part before tax is $146.47 from GMC dealer. I just want to make sure that this is going to fix the problem. I live in Florida and its hot and I need my AC and love my car and want to make sure this will fix this the first time and not spend all this money if I don't need too. What do ya'll think that I should do? I am taking it in Thursday to my regular dealership to have them diagnose it and they said they won't charge me that $155 fee if I go ahead with the thermostat replacement.
 

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I have a 2019 Acadia SLT-1 V6. I keep getting the steering assist code and my fans run high and my AC blows hot. I had my car at a dealership (one that I dont normally use) for another reason that I am not paying for and they informed me while they were already diagnosing my car for another issue caused by a accident. They told me that I need to replace my thermostat and quoted me $725. I called the dealership I normally use and they quoted me to replace thermostat $515 and change out the door. I know the part before tax is $146.47 from GMC dealer. I just want to make sure that this is going to fix the problem. I live in Florida and its hot and I need my AC and love my car and want to make sure this will fix this the first time and not spend all this money if I don't need too. What do ya'll think that I should do? I am taking it in Thursday to my regular dealership to have them diagnose it and they said they won't charge me that $155 fee if I go ahead with the thermostat replacement.
I have the same issue with my 2017 Acadia. It only does it on the the interstate and not local driving. My gmc dealership quoted me $900 and then a local garage quoted me half. I was told it’s mainly labor fee because of where the thermostat is located. Apparently, these cars are known to have that issue. Good luck!
 
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