A/C off to Protect Engine . . .
07-18-2017, 01:46 PM
#1
Teching In
Thread Starter
Join Date: Aug 2016
Posts: 14
Likes: 0
Received 0 Likes
on
0 Posts
A/C off to Protect Engine . . . I've got a warning telling me that the "A/C off to protect engine", while the engine temp gauge has gone dead (showing no temp at all, but does do the check-sweep on initial power-up). I have replaced the temp sensor AND the harness connector with new units, but no change. I disconnected the battery to let it reset, but I doubt that solves it. Any suggestions as to another place to look? I haven't pulled out the multimeter yet, but I wouldn't even know where to start testing, aside from continuity of the wires themselves.
Any other causes of that error message AND a dead temp gauge reading?
Any other causes of that error message AND a dead temp gauge reading?
07-18-2017, 08:05 PM
#2
Teching In
Thread Starter
Join Date: Aug 2016
Posts: 14
Likes: 0
Received 0 Likes
on
0 Posts
Well, upon reconnecting the battery, the temp gauge is now active and error message is gone. I haven't given it a test drive, but A/C was working fine at idle. Hopefully it's not a fluke.
07-19-2017, 11:29 AM
#4
Teching In
Thread Starter
Join Date: Aug 2016
Posts: 14
Likes: 0
Received 0 Likes
on
0 Posts
Yes, this was a failure of the sensor and/or the associated wiring. Upon driving the vehicle this morning approximately 15 miles, temperature needle held steady at mid-range on the gauge. I believe the PCM/BCM uses the coolant temp sensor for the sole source for temp gauge output and controlling engine parameters. If this had been a stuck thermostat, the gauge should have still been operational I'd think, but reading extremely hot as the coolant wouldn't be circulating through the radiator.
07-21-2017, 07:41 PM
#5
On The Tree
Join Date: Jan 2008
Location: Georgia
Posts: 163
Likes: 0
Received 0 Likes
on
0 Posts
Yes, this was a failure of the sensor and/or the associated wiring. Upon driving the vehicle this morning approximately 15 miles, temperature needle held steady at mid-range on the gauge. I believe the PCM/BCM uses the coolant temp sensor for the sole source for temp gauge output and controlling engine parameters. If this had been a stuck thermostat, the gauge should have still been operational I'd think, but reading extremely hot as the coolant wouldn't be circulating through the radiator.
07-25-2017, 10:35 AM
#7
Teching In
Thread Starter
Join Date: Aug 2016
Posts: 14
Likes: 0
Received 0 Likes
on
0 Posts
After replacing the temp sensor, the GXP has been running perfectly for almost two weeks now. No reason to suspect issues with the T-Stat, it was just a failed sensor/wiring.