Ambient Temperature Sensor Stuck or Haywire - Chevy Traverse Forum: Chevrolet Traverse Forum
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post #1 of 30 (permalink) Old 02-12-2011, 03:46 PM Thread Starter
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Ambient Temperature Sensor Stuck or Haywire

I headed out this morning before 8 with an outdoor temp of about 31 degrees F. As the sun came out and the day started warming, I noticed the temp display in the DIC had risen to 34 and was going no higher. I made several stops at different places killing and restarting the engine. It still registered 34 after each stop.

Finally, when it got to be over 60 outside with bright sunshine and my car refused to do anything but blow hot air in my face, I called a couple of dealers and found an Ambient Air Temperature Sensor for $31 US. I was headed to pick it up when all of a sudden I looked down and the DIC read 38 degrees. While I watched -- in less than a minute-- it climbed degree-by-degree from 38 to 64; the air conditioner coming on in the process.

Anybody else ever have this problem?
Anybody else think I should go ahead and change the sensor for good measure?

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post #2 of 30 (permalink) Old 02-12-2011, 06:03 PM
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Re: Ambient Temperature Sensor Stuck or Haywire

I see you have an LTZ; so I assume you have the digital HVAC system. One way to "reset" the outdoor temp sensor is to push the A/C button and the recirculate button at the same time. This button sequence should work as it works on my 07. Let me know if it does.

Another way is to get out on the highway and get some airflow to the sensor; I have noticed this works but takes much longer. The "two button" method is instantaneous
post #3 of 30 (permalink) Old 02-12-2011, 06:15 PM Thread Starter
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Re: Ambient Temperature Sensor Stuck or Haywire

Thanks for the tip. I'll give the 2-button method a try and report back.

I wish I'd known about it this morning when it was stuck on 34.

2011 GMC Terrain SLT-1, Mocha Steel Metallic w/ Brownstone leather interior<br />2011 Toyota Prius V, Black w/ gray leather and every available option<br />2001 Miata SE, Red w/ tan top<br /><br />"The problem with socialism is that sooner or later you run out of other people's money,"&nbsp; ~ Margaret Thatcher
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post #4 of 30 (permalink) Old 02-12-2011, 07:33 PM
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Re: Ambient Temperature Sensor Stuck or Haywire

We had the same issue with our 99 Regal. Our Traverse does the same thing. I'll have to try the "two button" method and see if it helps--thanks for the tip.

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post #5 of 30 (permalink) Old 02-12-2011, 09:07 PM
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Re: Ambient Temperature Sensor Stuck or Haywire

That is a handy little tip...let us know if it works for you guys. I don't know that it would be necessary on the manual HVAC models, but if I ever notice that the temp sensor is not reacting, I will know what to try.

THANKS!

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post #6 of 30 (permalink) Old 02-12-2011, 09:12 PM
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Re: Ambient Temperature Sensor Stuck or Haywire

is this the 1st time yours does this?
Ive posted a step/flow of how the computer updates the temp... that should be similar to the lambdas... it basically does not update temps right away under certain conditions.
But if youve noticed it change right away in similar conditions- then try the reset and if it still acts up- swap it out.

The outside air temperature is displayed on the Driver Information Center (Fig. , radio or rear view mirror in a number of GM vehicles. There may be some confusion about the operation of the display and how quickly it updates ambient temperature. Depending on several factors, the temperature may not be updated immediately and owners may feel that the display is inaccurate at times.

As an example, here's a look at the operation of the outside air temperature display on several GM small cars from recent model years (2004-2007 Malibu/Maxx; 2005-2010 Cobalt and G6; 2005-2006 Pursuit [Canada]; 2006-2009 Solstice; 2006-2011 HHR; 2007-2010 AURA, SKY and G5; 2008 Malibu Classic; 2008-2010 Malibu).



The ambient air temperature sensor is a variable resistor interfaced to the Body Control Module (BCM). The BCM provides the logic for reading the ambient air temperature sensor, filtering the data and transmitting the information via the serial data circuit to the outside temperature display. The outside air temperature algorithm uses three pieces of information: outside air temperature data, vehicle speed, and the time the engine was turned off.



When the engine is first started, the algorithm looks at how long the engine was off and if the outside temperature is lower than the last reading taken during the previous ignition cycle. From this information, it's determined if a new outside temperature reading should be taken.



If the engine was off long enough or the current outside air temperature is cooler than the stored value, a new outside temperature reading is taken and displayed. If the engine was not off long enough or the current outside air temperature is higher than the stored value from the previous ignition cycle, the last stored value of outside air temperature taken will be displayed.



The outside air temperature will continue to be updated every second as long as the outside air temperature is the same or cooler than the previous reading. Once the new outside air temperature reading exceeds the previous temperature and the vehicle is traveling less than 18 mph (29 km/h), the displayed outside air temperature will remain at its last value. Once the vehicle speed exceeds 18 mph, the displayed outside air temperature will be updated. If the speed drops below 18 mph, the outside air temperature will freeze at its last value.



When using a scan tool during diagnosis, it is possible that the temperature reading on the Tech 2 will differ from the temperature displayed on the DIC/radio without there being a problem with the vehicle. The DIC/Radio only displays the reading being sent from the BCM.



TIP: Do not replace the ambient air temperature sensor or the BCM for an inaccurate outside air temperature display condition.

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post #7 of 30 (permalink) Old 02-12-2011, 09:13 PM
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Re: Ambient Temperature Sensor Stuck or Haywire

Quote:
Originally Posted by Quantum
That is a handy little tip...let us know if it works for you guys. I don't know that it would be necessary on the manual HVAC models, but if I ever notice that the temp sensor is not reacting, I will know what to try.

THANKS!
im tempted to say that this 'trick' only works on the Digital AC systems. not the manual system

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post #8 of 30 (permalink) Old 02-12-2011, 10:39 PM
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Re: Ambient Temperature Sensor Stuck or Haywire

rbarrios,

I don't think this would apply to the manual HVAC system
post #9 of 30 (permalink) Old 02-13-2011, 09:10 PM
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Re: Ambient Temperature Sensor Stuck or Haywire

Anybody know were this sensor is located? I'm trying to install mine.
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post #10 of 30 (permalink) Old 02-13-2011, 09:34 PM
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Re: Ambient Temperature Sensor Stuck or Haywire

I thought that someone mention that it was in the intake air box.

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