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Cadillac XT5 Check Engine Light P0128 Steering Assist Reduced Thermostat Replacement
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- Опубліковано 16 лип 2023
- EZ Auto channel / @ezauto1911
The 2017 Cadillac XT5 in this video had P0128 code for the check engine light, a steering assist reduced message, a coolant temperature gauge that constantly read cold, and an always-on high engine fan speed. The thermostat and coolant temperature sensor were then replaced. Problem solved.
Part I used in this video.
GM# 12678779 thermostat x 1
GM# 12648547 coolant air bleeder tube O-ring x 2
GM# 12648665 Intake manifold gasket x 6
GM# 12650595 Coolant temperature Sensor x 1
Disclaimer This video is for entertainment purposes only Please using personal protection equipment when you working on vehicle like safety glasses, and gloves If you are not comfortable working on your vehicle, please contact professional
Great video. Very detailed, included part numbers, and a tragically common issue with even low mileage 3.6L engines.
This guy just out here saving us hundreds! Thank you.
You are welcome
Just got it done, thanks for taking the time to make the video and play by play with part numbers
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This is a common problem with the GM 3.6 V6 at 50-60k. The dealer will replace if still under powertrain warranty; if not expect $1,200 -$1,500 bill. Dealers have a high overhead and charge a lot of money for repairs. Most professional garages (I'm not talking about the corner gas station) can fix for little more than half the cost. But it is a pain in the rear to replace, about 3-5 hours work depending on how familiar the mechanic is with the repair. I'd talk to your independent shop and politely ask them if they have experience with GM 3.6 V6 with the P0128 code. My mechanic just rolled his eyes and said "You've got to be kidding me. At least one a month."
Awesome video and I love the attention to detail and part numbers. Our XT5 only has 30k miles on it and we are experiencing the same thing, so now I am going to tackle this job as well. Thanks!!
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Excellent video! Thank you so much for taking the time to make it. I just completed mine. I changed the spark plugs while I was in there since they also require removing the intake manifold.
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Impressive How To video! All the important information provided..You have set a gold standard!
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My 2018 XT5 (60,000 miles) started popping PO128 (no AC or temp gauge working), bought recommended parts and problem went away like magic.... I am sure it will return but when it does I will be ready! Thanks for the video!1
You are welcome.
Mine had the same problem. We replaced the part. 6 weeks later same issue started again. Now what?
@@debraogden3050 did you replace both thermostat and the sensor?
I am about to tackle this task, thanks for supplying the part numbers. Such and awsome guide!
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Thanks so much for this! Really helped.
merci très bon video et complet
Thank you for this wonderful video. This problem just popped up for me. Thanks to you I have ordered the necessary parts and tools I didn’t already have and will be tackling this problem this weekend.
Just did it today and man what a pain in the ass this is to get to, but thankfully this wonderful video exists and made this a much cheaper fix. Thank you so much, sir.
@@2311outlaw about how long did it take you? I don't have a swivel socket so I'm wondering if getting that bolt out that allows the pipe to move freely can be taken out by an extension.
@@Pinoy915 it didn’t take that long once I got that bolt out. Make sure you get the right one. It’s hard to get to. You will have to rip up that foam to get to it. I couldn’t manage to get at it without tearing that foam. I did use an extension to get it. I don’t think I used a swivel at all but I may have.
@@2311outlaw thanks for your reply. I saw another video where the guy got to it easier but he tore up the foam lol.
@@Pinoy915 yeah killing that foam makes life so much easier with that bolt.
Thank you for a well detailed video.
You are welcome.
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I use this video to replace mine Thank you very much
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Great video! I have seen a few videos on this topic band they did not drain the coolant. They removed another tube but I don't remember which one. I have a 2017 XT5 and about a year ago it had 70K and that error popped up. Took into the dealer where I purchased the car and they said it was my battery? It was over 5 years old and they replaced it and the message has not come back since?? Good to have this video since I am sure it is out of warranty now with 80K miles! Looking for 2017 XT5 spark plug change video if you have one!
Just did mine. Didn't have to take the thermostat out to change the sensor but need some trick sockets with a wobble drive shaft and swivel. If I had to do it all over again would take out the thermostat. Though not needed but makes the hob harder if you don't have an extensive socket wrench set.
I replaced just the coolant temp sensor on mine and it solved the problem for about 2 months. Then it was right back to all the same syptoms. I think it requires a thermostat replacement to actually fix these issues long term.
I'm fighting with the shop right now, they wanted to fix the steering. They won't listen, ugh I wish my brother lived closer, he could do this.
Can you find another shop and ask for second opinion?
I have changed the thermostat and I still have the same issues and warning - power steering assist?????
Any additional info would help tremendously before we take it into the dealer
I have a 2019 xt5, same problem.. I have no a/c temp gauge not working … I took out the negative battery cable for 2 minutes and put it back and I guess it reset the software and a/c works again, auto stop works again
I have the same project, Are you happy with that thinkodb 100 or would you rebuy a better unit?
The thinkobd 100 work pretty good for me. It dose the basic engine code reading, and some get some usful live engine data, for example, short and long term fuel trim for air leaks or fuel leaks diagnostic, engine coolant temperature reading, induction air temperature reading, and etc..
It turned out on my 2017 model
The coolant resivouir cap is a 20 psi cap which raises the boiling temperature 2 degrees for 1 psi equals 40 degrees. The cap was bad not allowing the boiling temperature to raise 40 degrees. It was opening too soon and leaking coolant fluid at a lower psi. So the operating temperature could not rise to the needed temperature. I replaced the cap and everything is operating properly.
If your having this problem wit th xt5 steering assist no a/c unhook your battery for th nite and it will reset it my car was doing this and my daughters also and thts wat I dd and hunt had an issue yet
I had the same problem, but my problem was constant IE: Fans on high, no temperature reading, steering assist reduced. I replaced only the temperature sending unit with a GM Part. This did not fix the problem. So I disconnected the battery let it set and then reconnected. The issue went away, everything went to normal for about a week. Then it happened again, once again I disconnected the battery, everything went to normal for about a week, then it happened again. I am on the fourth time now, thinking about changing the thermostat not sure why this would have anything to do with it. Also thinking about checking the sending unit plug connector.
I am at a loss. The engine is not overheating, the last time I drove for about 30 miles it ran fine. Any suggestions ?
It is likely the thermostat. The steering assist gets a temp reading from the coolant temp sensor. this allows it to estimate the viscosity of the grease in the system to either provide more assist when cold or less when its hot as the grease is thinner when warmed up. When the computer recognizes that the operating temp has not been met within a certain amount of time, it will cut off the temp sensor data, dropping the coolant gauge to 0 and forcing cooling fans to max as a failsafe mode. since the car then has no cooling data to go off of, it is playing it safe by having fans at max and no ac to reduce heat load. even though the car is not overheating but underheating. Replacing thermostat will more than likely fix the problem. There is a TSB on the lgx engine and this problem due to how common the oem thermostats for this engine go bad.
Unplugging the battery is a temp *solution* since it will clear the ending codes. when thee is no codes the sensor and car functions go back to default and temp readings will work until the computer deems a underheating problem again, pinging the code into pending and rinse repeat above. too low of temp could cause problems with bearings and sludge in engine. due to coolant sensor being cheap people say replace it while doing thermostat as a preventative situation of possibly having to take it apart again if the sensor does go bad. using a scan tool live data function can inform the exact problem. In my instance, its just like the tsb describes and is the thermostat. My thermostat is opening too soon and getting stuck at times. With engine temps most of the time running at 180 most of the time and occasionally higher but it is supposed to be ~200-208.
There are a couple other situations to check with a mechanic and have them confirm one such could be the coolant reservoir cap not sealing completely, a good mechanic should be able to narrow and confirm the exact problem or problems related to the system. all parts from dealer should cost ~120-140 plus mechanic labor rates. labor is about 1-3ish hours including drain and fill of cooling system. If coolant is original and many years old or high mileage, not much more for some fresh coolant, this would also be a perfect time for that but not necessarily a must.
Did you have to clear the faults in the ECU after replacing the sensor to get the temperature gage to start working again?
I used a basic OBD2 reader to clear the code after the installation
@@ezauto1911 if I don’t have an OBD2 reader, can I just disconnect the negative terminal off my battery for 10 minutes to clear the code?
@@walterneilson8119 I did not try the disconnect negative better terminal method. However, you can go to an auto part store and borrow their OBD2 reader to clear codes.
Actually… I was driving the car to the auto parts store and the computer reset itself about 5 miles … auto parts store checked the codes… no codes and I could see the temperature on their scanner…. All good now… thank you for your great video
XT5. Mine had the same problem. We replaced the part. 6 weeks later same issue started again. Now what needs to be done?
Did you change the thermostat, and the coolant temperature sensor together? If you did, you can use an engine scanner to check if the coolant temperature sensor is probably reading, and use a pressure tool to check coolant reservoir cap can hold the proper pressure.
Is the coolant level good?
Needs a thermostat. Ct sensor generally is not the problem. Do not tear engine apart. Remove the thermostat while removing it from the pipe at rear of motor. Yes it's a pita but it can be done. P0128 and there is a gm tsb on this.
Check with your dealer service department 1st. It may be under warranty.
Ur rite. It mite be under ur 6yr 60k warranty. Call Gm or caddy first ppl , could save you hundreds!
I’m having the same problems, but my problem is now finding the parts can you help me find the parts hit me back thank you
I got a newer one of these POS, and I am wondering how many days after the Warranty expires will it start falling apart.
P0128. Gm electronics 101. Replace thermostat. There is a gm tsb on this. Coolant sensor is rarely the problem.
Great video are you in Dallas...lol
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And plus our AC not working/ temp gauge stays on C and does not work, auto on/off not working?????
We have ordered the coolant temp sensor and probably gonna buy a battery tomorrow.
Btw it’s a 2019 xt5 and it has 74k miles
Can you use an OBD code reader to see if there is any code? If you have P0128, this is the code related to the coolant temperature sensor. If the code present and the cooling temperature sensor not reading in the ODB reader it could cause the AC not turning on and power steering assist the message because of the false cooling temperature reading. I know some people disconnect the battery, or use an OBD reader to rest the code, and it could bring back the coolant temperature gauge reading.
in one video, this issue is under power train, he said it 7 years, so maybe its still under warranty, now its nov 14 2023 i took my xt5 in and they have back order
I'm hoping the same because mine is 2017 with 54k miles and it is starting to show steering assist failure with pending P0128.
2017 Cadillac XT5 Warranty
Cadillac covers the 2017 XT5 with a four-year/50,000-mile bumper-to-bumper warranty and a six-year/70,000-mile powertrain warranty.Jul 16, 2020
Did you get yours back yet, I just took mine in as well today
I don't remember who said it but it was mentioned that it's unlikely the sensor. I ended up doing it myself and it got rid of the code and the temp gauge is fine and no more lane assist failures. I didn't change the sensor, just thermostat. Took me about 1.5hrs.
@@Pinoy915 unfortunately I took mine to the shop they told they yesterday they had the part in stock and it would be fixed later that day, called today on day 2 they said it’s in back ordered