A/C off to Protect Engine . . .
Thread Starter
Teching In
Joined: Aug 2016
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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?
MY friends car did that when her thermostat had failed. We replaced the thermostat and problem went away. I am assuming this was more temp related and not the actual thermostat as I am not aware the car can monitor that part itself?
Thread Starter
Teching In
Joined: Aug 2016
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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.
On The Tree
Joined: Jan 2008
Posts: 163
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From: Georgia
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.
Thread Starter
Teching In
Joined: Aug 2016
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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.
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