Cooling fan stuck on high - Page 2

Eldi Z · 06-08-2018, 02:00 PM

Reporting back that it was not water / moisture related.
The phenomena did not re-occur until today.

Situation as follows:

- Drove the car as usual, all normal for ~ half and hour.

- Stopped somewhere to eat for ~ 1 hour and when I started the engine it happened again!
Fan full blast, Temp gauge pegged on Min. / Low (although true Temp. is expected to be higher: I.E. normal Temp. coolant restarting the engine after ~ 1 hour at ambient of ~ 80F), AC would not kick in.

- Stopped the engine and fan keeps on running full blast, even after closing and locking the doors.

- Opened the door and started the engine and everything back to normal: Fan not blowing full blast any longer and Coolant Temp. gauge displaying normal Temp. ~ 195

This random behavior is driving me insane - What is going on here? What can it be? Anyone who can add details / encountered it and got it solved - Please chime in

Eldi Z · 07-01-2018, 08:27 AM

Bumping this thread up again.

Just wanted to quickly update the community that the phenomena of going into "Safe Mode" (Fan at full blast, AC not working, Coolant Temp. Gauge pegged at Min.) began happening ever so often.
CEL illuminated constantly, unless codes erased.

In addition, when driving for over 15 minutes this way, the oil pressure began increasing (ECM protection measure: solenoid closing the oil pump pressure valve, since the assumption that there might be an overheating issue going on)

The P01119 DTC on the diagnostics scanner (ECT Sensor malfunction intermittent) came up every time and eventually brought up P01118 as well (ECT Sensor Signal High), which basically means high resistance = disconnection of the thermistor wire inside the sensor.
Had the dealer replace the ECT sensor last week (for anyone interested in the correct Part#, LT1 V8,: AC Delco 213-4333 / GM 12608814).
Warranty claim.
Problem resolved (so far). No DTC anymore. Hope it will not come back.

Looks like the problem was indeed a faulty ECT sensor from the factory. I was told that when they are new, this is a very seldom case - But can happen.

Camar05 · 03-25-2019, 12:23 PM

Anybody have a issue like this with their v6? Unfortunately, I am having the same intermittent issues of low temp gauge, no A/C, and cooling fans running after car is shut off. I cant find anybody with a v6 that had this issue.

P0128 pops up when driven under the right conditions during this issue, but I know it's not a thermostat issue because I'm getting heat through my vents.

Any help is appreciated

mrgoodbytes · 03-26-2019, 06:18 AM

I know there are some TSB's related to securing some of the wiring looms from getting pinched/caught up causing exposed copper wiring which could cause all sorts of problems. That may be worth checking out, although I can't remember if they are only applicable to the SS or ZL1.

https://www.camaro6.com/forums/showt...php?p=10234543 (for ABS so may not be related)
https://www.camaro6.com/forums/showthread.php?t=527188
https://www.camaro6.com/forums/attac...5&d=1550363760

Mountain · 09-20-2019, 08:59 PM

Quote:

Originally Posted by Camar05

Anybody have a issue like this with their v6? Unfortunately, I am having the same intermittent issues of low temp gauge, no A/C, and cooling fans running after car is shut off. I cant find anybody with a v6 that had this issue.

P0128 pops up when driven under the right conditions during this issue, but I know it's not a thermostat issue because I'm getting heat through my vents.

Any help is appreciated

DTC P0128 = Engine Coolant Temperature (ECT) Below Thermostat Regulating Temperature

Craftsmansteve · 11-23-2019, 07:25 PM

Mountain so what number in your diagram is the actual sensor that I need to replace? Thanks

cellsafemode · 11-23-2019, 10:07 PM

I found this issue in my car to be due to a code that was thrown for reading the temp sensor. Once this code is thrown (no cel) the ecu wont re-test it for like 20+ restarts. While this code is thrown, the ecu will ignore the temp sensor readings and pretend like it's potentially always overheating, showing 0 temp in the dash.

If you read real temp in a scanner then you can clear the code for the temp sensor and it should immediately work like normal ( no restart of the car needed).

If you dont see the code or after clearing the codes you do see and nothing new shows up and you still have no temp, then you need to use a better scanner that can read all of the submodules independently. It's in there still and your scanner isn't clearing it.

edit: perhaps related, probably not, but this coincided roughly with my HMI unit getting a bit fritzy and then finally failing (black screen of semi-death...where everything works but video output ...and usb is intermittant).

Mountain · 11-24-2019, 08:10 PM

Quote:

Originally Posted by Craftsmansteve

Mountain so what number in your diagram is the actual sensor that I need to replace? Thanks

From memory, and what seems rational to me, is #2. I remember looking it up and noting it was a bit buried (under the intake manifold).

wal-dog · 11-24-2019, 09:11 PM

Just had this happen. It was raining. Temp gauge said low and the fans ran full blast even when I shut the car off. I disconnected the fan harness to get it to shut off. Plugged in back in the next day and it hasn't happened sense.

Craftsmansteve · 11-26-2019, 10:10 AM

Thanks Mountain

Bumbleboy92 · 11-27-2019, 01:31 AM

I’ve been having the issue for a while, it went away for a few months but has recently resurfaced. I’ll try to find a part number using Mountains diagram now that I have some place to look.

Very temporary fix is unplug the negative off the battery and replug it to reset.

Edit: I think I found it (12650595) but it’s not the same as Mountains diagram

TJay74 · 11-28-2019, 11:34 AM

This code is caused by a stuck open thermostat or from replacing the OEM 194° thermostat with a 160° thermostat.

The ECM has to see at least 167° with in soo many minutes after the start of the drive cycle otherwise it will kill the gauges, turn the fans on. As said you can pull the battery cable and get it back to normal, but once it trips again it will do the same thing.

Have any of you replaced your OEM thermostat with a lower than OEM temp thermostat? If you do you will need to turn the P0128 code off in the tune.

Street Lethal · 08-15-2020, 03:30 AM

Quote:

Originally Posted by Camar05

Anybody have a issue like this with their v6? Unfortunately, I am having the same intermittent issues of low temp gauge, no A/C, and cooling fans running after car is shut off. I cant find anybody with a v6 that had this issue.

P0128 pops up when driven under the right conditions during this issue, but I know it's not a thermostat issue because I'm getting heat through my vents.

Any help is appreciated

I noticed that in my case, this will only trigger when I intend to put the heat on with the temp setting already set at 80 degrees plus, but forget to turn the AC button off because it turns on automatically. After a few seconds in this state (high temp setting, AC on) there is a skew. It reminds me of when we would trip the old OBD1 ECU's through the ALDL, and the fan would kick in, with the Coolant Temp gauge bottoming out. It resets after a few starting attempts, but I will just disconnect the battery to reset it if I don't want to wait...

- Rob

cellsafemode · 08-15-2020, 11:44 AM

I never use the ac or heater. Can probably count on one hand how many times it's been on in the past 4 years.

Stock thermostat.

I've seen the issue occur when starting the car on steep inclines more than not... But it is a super rare intermittent issue. I just plug my diagnostic device in and clear the code that triggers it and it immediately behaves like normal.

I'd be willing to bet it is a faulty temp sensor connection. Thing is the ECU won't retest in for like 12 starts after a failure. Also, you gotta love the lack of a dic or ces from it.

03-26-2019, 06:18 AM	#18
mrgoodbytes Drives: '18 2SS/EU (+Recaros) M6 Red Hot Join Date: Nov 2018 Location: Sweden Posts: 260	I know there are some TSB's related to securing some of the wiring looms from getting pinched/caught up causing exposed copper wiring which could cause all sorts of problems. That may be worth checking out, although I can't remember if they are only applicable to the SS or ZL1. https://www.camaro6.com/forums/showt...php?p=10234543 (for ABS so may not be related) https://www.camaro6.com/forums/showthread.php?t=527188 https://www.camaro6.com/forums/attac...5&d=1550363760

11-27-2019, 01:31 AM	#25
Bumbleboy92 Long hauler Drives: 2022 Camaro 2SS 1LE Join Date: Mar 2017 Location: Houston, TX Posts: 1,616 View My Garage	I’ve been having the issue for a while, it went away for a few months but has recently resurfaced. I’ll try to find a part number using Mountains diagram now that I have some place to look. Very temporary fix is unplug the negative off the battery and replug it to reset. Edit: I think I found it (12650595) but it’s not the same as Mountains diagram Last edited by Bumbleboy92; 11-27-2019 at 01:58 AM. Reason: Found sensor

11-28-2019, 11:34 AM	#26
TJay74 Drives: 17 Camaro SS 1LE & 16 Sierra AT CC Join Date: Nov 2016 Location: Norman, OK Posts: 2,424	This code is caused by a stuck open thermostat or from replacing the OEM 194° thermostat with a 160° thermostat. The ECM has to see at least 167° with in soo many minutes after the start of the drive cycle otherwise it will kill the gauges, turn the fans on. As said you can pull the battery cable and get it back to normal, but once it trips again it will do the same thing. Have any of you replaced your OEM thermostat with a lower than OEM temp thermostat? If you do you will need to turn the P0128 code off in the tune. __________________ 2019 Corvette Z06 2LZ A8 - Halltech CAI, AWE non-catted X-pipe, Mamo V2 ported TB 592rwhp, bone stock 566rwhp 2017 Camaro SS 1LE - Procharger D1SC w/ Tial 2" BOV & Race intercooler / ARH full length catless headers / Alky meth injection system - 650rwhp on conservative tune SOLD

06-08-2018, 02:00 PM	#15
Eldi Z Drives: 17' 1SS 1LE GBA-Black Join Date: Mar 2017 Location: TLV Posts: 810	Reporting back that it was not water / moisture related. The phenomena did not re-occur until today. Situation as follows: - Drove the car as usual, all normal for ~ half and hour. - Stopped somewhere to eat for ~ 1 hour and when I started the engine it happened again! Fan full blast, Temp gauge pegged on Min. / Low (although true Temp. is expected to be higher: I.E. normal Temp. coolant restarting the engine after ~ 1 hour at ambient of ~ 80F), AC would not kick in. - Stopped the engine and fan keeps on running full blast, even after closing and locking the doors. - Opened the door and started the engine and everything back to normal: Fan not blowing full blast any longer and Coolant Temp. gauge displaying normal Temp. ~ 195 This random behavior is driving me insane - What is going on here? What can it be? Anyone who can add details / encountered it and got it solved - Please chime in

07-01-2018, 08:27 AM	#16
Eldi Z Drives: 17' 1SS 1LE GBA-Black Join Date: Mar 2017 Location: TLV Posts: 810	Bumping this thread up again. Just wanted to quickly update the community that the phenomena of going into "Safe Mode" (Fan at full blast, AC not working, Coolant Temp. Gauge pegged at Min.) began happening ever so often. CEL illuminated constantly, unless codes erased. In addition, when driving for over 15 minutes this way, the oil pressure began increasing (ECM protection measure: solenoid closing the oil pump pressure valve, since the assumption that there might be an overheating issue going on) The P01119 DTC on the diagnostics scanner (ECT Sensor malfunction intermittent) came up every time and eventually brought up P01118 as well (ECT Sensor Signal High), which basically means high resistance = disconnection of the thermistor wire inside the sensor. Had the dealer replace the ECT sensor last week (for anyone interested in the correct Part#, LT1 V8,: AC Delco 213-4333 / GM 12608814). Warranty claim. Problem resolved (so far). No DTC anymore. Hope it will not come back. Looks like the problem was indeed a faulty ECT sensor from the factory. I was told that when they are new, this is a very seldom case - But can happen.

03-25-2019, 12:23 PM	#17
Camar05 Drives: NGM '16 2LT A8 Join Date: Feb 2014 Location: Sin City, NV Posts: 175	Anybody have a issue like this with their v6? Unfortunately, I am having the same intermittent issues of low temp gauge, no A/C, and cooling fans running after car is shut off. I cant find anybody with a v6 that had this issue. P0128 pops up when driven under the right conditions during this issue, but I know it's not a thermostat issue because I'm getting heat through my vents. Any help is appreciated

11-23-2019, 07:25 PM	#20
Craftsmansteve Drives: 2016 V6 Camaro RS Join Date: Oct 2017 Location: Winchester Posts: 24	Mountain so what number in your diagram is the actual sensor that I need to replace? Thanks

11-23-2019, 10:07 PM	#21
cellsafemode Drives: 2016 Camaro 1LT Join Date: Jan 2016 Location: California Posts: 3,491	I found this issue in my car to be due to a code that was thrown for reading the temp sensor. Once this code is thrown (no cel) the ecu wont re-test it for like 20+ restarts. While this code is thrown, the ecu will ignore the temp sensor readings and pretend like it's potentially always overheating, showing 0 temp in the dash. If you read real temp in a scanner then you can clear the code for the temp sensor and it should immediately work like normal ( no restart of the car needed). If you dont see the code or after clearing the codes you do see and nothing new shows up and you still have no temp, then you need to use a better scanner that can read all of the submodules independently. It's in there still and your scanner isn't clearing it. edit: perhaps related, probably not, but this coincided roughly with my HMI unit getting a bit fritzy and then finally failing (black screen of semi-death...where everything works but video output ...and usb is intermittant).

11-24-2019, 09:11 PM	#23
wal-dog Drives: 2016 Garnet Red 1SS Join Date: Feb 2011 Location: Tucson Posts: 208	Just had this happen. It was raining. Temp gauge said low and the fans ran full blast even when I shut the car off. I disconnected the fan harness to get it to shut off. Plugged in back in the next day and it hasn't happened sense.

11-26-2019, 10:10 AM	#24
Craftsmansteve Drives: 2016 V6 Camaro RS Join Date: Oct 2017 Location: Winchester Posts: 24	Thanks Mountain

08-15-2020, 11:44 AM	#28
cellsafemode Drives: 2016 Camaro 1LT Join Date: Jan 2016 Location: California Posts: 3,491	I never use the ac or heater. Can probably count on one hand how many times it's been on in the past 4 years. Stock thermostat. I've seen the issue occur when starting the car on steep inclines more than not... But it is a super rare intermittent issue. I just plug my diagnostic device in and clear the code that triggers it and it immediately behaves like normal. I'd be willing to bet it is a faulty temp sensor connection. Thing is the ECU won't retest in for like 12 starts after a failure. Also, you gotta love the lack of a dic or ces from it.

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