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Old 08-12-2014, 11:02 AM   #29
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I had something similar, I just added more coolant, and it went away.
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Old 08-12-2014, 11:08 AM   #30
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whats scary with this thread is that no one ever noticed the car engine having temp issues it was because the A/C shut down, that's some funny crap, pay attention people your car is talking to you all the time. There is a reason the car has a guage for engine temp, its important and not just overheating but too cool as well, I cant tell you how many emission failures I see for a stuck open T-stat running too cool.
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Old 08-18-2014, 09:59 AM   #31
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I disconnected the ECU (both cables) and the issue remains. The engine is not overheating but I get the indications that it is. Yesterday it did it again and I got the "Reduced Power" message. I do notice the temp indications before the AC goes out.
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Old 08-25-2014, 06:34 PM   #32
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I am having this issue as well, I replaced the coolant sensor last year when it started doing it, and about 4-6 months ago I replaced the thermostat when it started doing it again. Its been fine all summer until today.

Any solutions? I took it to the dealership when I had my thermostat replaced, and I think they were clueless.

I know the engine is not overheating, and my coolant gauge on the DIC is not working, but my Aeroforce gauges are reading coolant just fine, and its staying around its normal temp.
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Old 10-15-2014, 10:05 AM   #33
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GM Customer Service - Any ideas? I am still having this issue!
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Old 10-15-2014, 08:21 PM   #34
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GM Customer Service - Any ideas? I am still having this issue!
Brett64D,

My apologies that you're still experiencing the concern that others have also noted. Since we rely on our dealers for technical assistance, I wouldn't be able to offer any advice to help explain this over the forum. However, a certified GM tech would be in the best position to explore what's going on. What I can do is reach out to the dealer's customer experience manager (if you feel an official diagnosis is necessary) and let them know that you contacted us so they can further assist. Feel free to contact us privately if you want to discuss this further.

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Old 05-04-2015, 08:00 PM   #35
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Sorry to leave you guys hanging. I haven't been on here in a while.

A dtc p0128 usually sets with the "a/c off due to high engine temp" message. The dash lies to you and tells you your car is running too hot, when in reality p0128 is a code for the car not reaching operating temperature fast enough. Which 99% of the time is caused by a stuck upen thermostat.

The actual description for dtc p0128 is "engine coolant temperature below thermostat regulated temperature". The reason the dtc is there is because the car needs to reach operating temperature as soon as possible in order to achieve closed loop and operate more efficiently.

If you have a 160 degree thermostat in your vehicle that is a good reason for that particular code to set. Your ECM is looking for coolant temps 180-210ish depending on ambient air temperatures, and if it stays around 160, or takes a really long time to reach 180ish, p0128 will set and your dash will tell you the car is running hot so you will take it in and get the problem fixed.
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I have not tried the ECM harness disconnect/reconnect procedure, but my scenario throws up more questions:

Mine happened right after pulling out of an area making a right and doing a very quick 1/2 second throttle burst - the car was instantly turned 90 degrees, so I believe it may have happened due to being jarred. Now the check engine light comes on with "AC shut off due to high engine temp". I check the dash engine temp and it displays "--- " for temp, center console SS gauges show good oil pressure, but no oil temp (since we don't have real oil temp sensors - it's a derived #, I believe coolant temp must be in the equation).

Now here's the odd thing..... I have Aeroforce dual pod gauges off the OBD2 port. I changed one of the 4 readouts to Engine Coolant Temp and it is working. If I unplug the sensor on the drivers side head, the Aeroforce gauge readout no longer reads out correct (some gigantic #), I plug it back in and the gauge works again - but the dash reading still reads "---". This tells me the sensor is working.

To add to the mix, 6 months ago my gas level gauge turned off on the way back from Sturgis, but could be reactivated by doing a quick Wide-open-throttle pass. Fuel pressure readings were always good - so wasn't overly concerned, except it's nice to know when you need fuel when traveling LOL. It came back about 3 more times, but each time could be rectified by a WOT pass. Went away and never happened again.

I'll post up here when I find the solution. Brian at WyoSpeed suggested check the ECM wiring also.
So thanks to Daniel.... good explaination of the P0128 code. Makes total sense. To add to all these notes: I no longer disconnect my ECM harness to clear this condition. To get my gauges back & re-enable my AC system, I simply clear the DTC code using my Aeoforce gauges and everything goes back to normal. Any code reader should be able to do this. I'm 100% sure my thermostat is perfect. I think it's just that it's looking for 190 deg thermostat response and not a 160. I'll have to dig around in the tune for possible settings - worst case, just turn off the DTC since it's really a safeguard for someone that doesn't monitor their engine. Not like your turning off an overheating warning.
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Old 05-04-2015, 09:52 PM   #36
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Here's where to turn off the P0128 DTC in EFI Live. I'll try this and see if I stop randomly loosing the gauges, along with the AC system being disabled. I'm hoping the actual DTC being triggered is what kills the gauges and AC until the code is cleared.

I know the sensors for engine coolant temp and oil temp have been working, because I can view them on my Aeroforce gauges that get data from the OBDII port.

.... notice that ECT is still monitored for "sensor performance", "sensor circuit low", and "sensor circuit high" - so it's not being left totally unmonitored.
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Old 05-05-2015, 06:42 AM   #37
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After three generations of camaro owners I think I may trade mine in and go to ford or Toyota. This and all the problemsI've had is senseless
Toyota doesn't make a comparable car to a Camaro. Also EVERY car manufacturer has a SERVICE DEPT, so they all break down. I'll gladly deal with GM issues over Ford or Toyota issues anyday.
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Old 11-04-2016, 01:21 AM   #38
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Originally Posted by Blue70SS View Post
Here's where to turn off the P0128 DTC in EFI Live. I'll try this and see if I stop randomly loosing the gauges, along with the AC system being disabled. I'm hoping the actual DTC being triggered is what kills the gauges and AC until the code is cleared.

I know the sensors for engine coolant temp and oil temp have been working, because I can view them on my Aeroforce gauges that get data from the OBDII port.

.... notice that ECT is still monitored for "sensor performance", "sensor circuit low", and "sensor circuit high" - so it's not being left totally unmonitored.
So.... turning off the P0128 DTC in the tune does in fact make this situation go away entirely. However I do have a 160 degree thermostat that is working perfectly and I monitor it anyway, plus turning off the DTC is not going to stop "high coolant temp" from being displayed, so for me its a permanent fix. I no longer get the code that shuts down the AC and my center console gauges don't go dead now.
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Old 05-05-2017, 01:01 PM   #39
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I've been dealing with this issue.

I changed the sensor by the driver side headers (coolant temp sensor) and the wire connector. Did not fix the issue.

Thermostat next I guess. The car regulates just fine so I'm not optimistic that the thermostat will fix the issue.

We'll see.
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Old 05-05-2017, 01:34 PM   #40
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So I found the problem with the gauges last night. I searched on this website for any thread containing "Temperature" and found 2 or 3 of them that described my problem to the "T." The fix is as simple as removing both connectors to the EMC and reconnecting them. It instantly fixed the issue and everything works as advertised.
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Old 05-16-2017, 02:12 AM   #41
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So I found the problem with the gauges last night. I searched on this website for any thread containing "Temperature" and found 2 or 3 of them that described my problem to the "T." The fix is as simple as removing both connectors to the EMC and reconnecting them. It instantly fixed the issue and everything works as advertised.
Did not fix mine. I still have to change the thermostat but I'm not confident it will help.
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Old 05-18-2017, 06:27 PM   #42
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I'm headed outside to swap thermostats now.

If this doesn't fix the problem I'm going to blame a politician and then shoot my cats one by one. It's not their fault but it might make me feel better.

Wish me (and the cats) luck.
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