Coolant Temp Sensor help... - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

PQ · 05-21-2017, 04:39 PM

Been asked a few times on the site but each time seemed to be a bit different of a solution.

So I'll ask in a new thread.

I am getting the 'AC Off Due To High Engine Temp' message. Been going on intermitantly for a while now. Well it's permanent now. I can reset the ECU but it will come back after a few miles.

I swapped sensors and put a new connector on it. Wires look good.

I have tested the sensors (both old and new) and tested power and continuance to the connector. Changed the thermostat with a new one and tested the old one and found it was good anyway. New coolant of course.

Dash temp gauge turns off when the issue comes on.

So I'm at a total loss.

The code comes on immediately upon starting a cold engine or hot engine. Unless I unplug the computer and plug it back in. Then, like I said, I'll get a few miles before it comes back on. Codes are P0116 and P0118.

I get a P219A but I suspect it's a result of the hard start and low efficiency brought on by the temp issue.

Interesting note, the dash temp gauge shows just a tad warm when I start it after a reset. Weird.

Bo White · 05-21-2017, 05:07 PM

This curcuit may share info in the computer to another curcuit. Didnt you wreck the car a while back. You may have a pinched harness.

PQ · 05-21-2017, 06:01 PM

The continuance test shows a full circuit. The electrical diagram shows no sharing on that circuit either.

But if so, how would I chase that down?

Bo White · 05-21-2017, 09:13 PM

Have you had a Tech 2 or MDI used on the car?

PQ · 06-07-2017, 05:57 PM

Don't know what those are. I have tested every component.

sdynak · 06-07-2017, 06:38 PM

Just for laughs try leaving the old sensor out & connected to it doesn't get as hot and see if it still does it.. Meaning eliminate a real engine hot possibility.. If it still does it then it has to be an electrical issue and time to get busy there. Fans on when it does this I assume?

05-21-2017, 04:39 PM	#1
PQ Booooosted. Drives: 2010 Supercharged SS Join Date: Apr 2008 Location: Mobile, AL Posts: 36,717 View My Garage	Coolant Temp Sensor help... Been asked a few times on the site but each time seemed to be a bit different of a solution. So I'll ask in a new thread. I am getting the 'AC Off Due To High Engine Temp' message. Been going on intermitantly for a while now. Well it's permanent now. I can reset the ECU but it will come back after a few miles. I swapped sensors and put a new connector on it. Wires look good. I have tested the sensors (both old and new) and tested power and continuance to the connector. Changed the thermostat with a new one and tested the old one and found it was good anyway. New coolant of course. Dash temp gauge turns off when the issue comes on. So I'm at a total loss. The code comes on immediately upon starting a cold engine or hot engine. Unless I unplug the computer and plug it back in. Then, like I said, I'll get a few miles before it comes back on. Codes are P0116 and P0118. I get a P219A but I suspect it's a result of the hard start and low efficiency brought on by the temp issue. Interesting note, the dash temp gauge shows just a tad warm when I start it after a reset. Weird. __________________

05-21-2017, 05:07 PM	#2
Bo White Drives: 2015 Summit White 2SS 1LE Join Date: Feb 2012 Location: Vance Alabama Posts: 8,091	This curcuit may share info in the computer to another curcuit. Didnt you wreck the car a while back. You may have a pinched harness. __________________ Retired wanna be cylinder head porter 2015 2SS 1LE Clutch reservoir, Vararam DRX, ported TB, TSP 2" headers, MGW shifter, stage 4 cam and Wilkes 11° 65cc heads Totalled: 2010 1SS Wilkes Performance/Eagle 416 shortblock, TSP custom valvetrain, PRC 260 heads, Edelbrock Pro Flo 102, th400 swap, 8" PTC 5500 stall= 535/435 at the wheels tuned Gen 3 Performance and Dyno 10.97 @ 124 full weight in 3100 DA CamaroFest X

05-21-2017, 06:01 PM	#3
PQ Booooosted. Drives: 2010 Supercharged SS Join Date: Apr 2008 Location: Mobile, AL Posts: 36,717 View My Garage	The continuance test shows a full circuit. The electrical diagram shows no sharing on that circuit either. But if so, how would I chase that down? __________________

05-21-2017, 09:13 PM	#4
Bo White Drives: 2015 Summit White 2SS 1LE Join Date: Feb 2012 Location: Vance Alabama Posts: 8,091	Have you had a Tech 2 or MDI used on the car? __________________ Retired wanna be cylinder head porter 2015 2SS 1LE Clutch reservoir, Vararam DRX, ported TB, TSP 2" headers, MGW shifter, stage 4 cam and Wilkes 11° 65cc heads Totalled: 2010 1SS Wilkes Performance/Eagle 416 shortblock, TSP custom valvetrain, PRC 260 heads, Edelbrock Pro Flo 102, th400 swap, 8" PTC 5500 stall= 535/435 at the wheels tuned Gen 3 Performance and Dyno 10.97 @ 124 full weight in 3100 DA CamaroFest X

06-07-2017, 05:57 PM	#5
PQ Booooosted. Drives: 2010 Supercharged SS Join Date: Apr 2008 Location: Mobile, AL Posts: 36,717 View My Garage	Don't know what those are. I have tested every component. __________________

06-07-2017, 06:38 PM	#6
sdynak Drives: 2014 ZL1 Join Date: Aug 2015 Location: Bayville, NJ Posts: 949	Just for laughs try leaving the old sensor out & connected to it doesn't get as hot and see if it still does it.. Meaning eliminate a real engine hot possibility.. If it still does it then it has to be an electrical issue and time to get busy there. Fans on when it does this I assume? __________________ 2014 ZL1 Black All OEM, Manual SOLD: 2010 1SS LS3, Black, 235/250, .621/.615, 114 + 4, Kooks Stepped Headers, 3.91's, Bo White PTB, Flowmaster Mufflers, Cold Air Industries CAI, Apex Scoop & Windshield Washer Relocate, SLP Wheels, Skip Shift Eliminate, Barton Flat Stick, OEM HID/Halos, Dyno Tuned by ECS