IAT sensor - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > Air Induction

Air Induction Performance Air Intake/Air Induction Modifications

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  #1  
Old 07-17-2009, 10:41 AM
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2002 Chevy TrailBlazer LS
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IAT sensor

So i got a check engine light and i replaced the IAT sensor because that is what the code said was wrong. I erased the codes but not even a day later the code came back. any ideas? P0113
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  #2  
Old 07-17-2009, 11:12 AM
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i had po113 and it was cuz i forgot to plug in the sensor on the intake tube
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  #3  
Old 07-17-2009, 11:27 AM
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Welcome, rider. I'd guess that somebody who just replaced their sensor would ensure it was plugged in at the end of the process.

One reason for P0113 could be a mismatch between IAT and ECT when the engine is cold. Have you noticed any odd behavior of the coolant temp gauge?
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Old 07-17-2009, 05:35 PM
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New IAT sensor

I am having the same problem with the check engine light throwing the code PO113. I too have replaced the IAT sensor and the next day the code was back! I have a K&N intake filter install on my '02 Envoy.
Any body have any insight on what could be causing this code to keep coming back?
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  #5  
Old 07-17-2009, 05:50 PM
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check the wiring on the IAT sensor to make sure it aint melted, broken or anything?
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Old 07-18-2009, 02:53 PM
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The wiring is fine.... everything else is normal.
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Old 07-23-2009, 05:41 AM
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checked all my wires and they all look good. i am thinking about taking it to the deler cuz that light drives me crazy!
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Old 07-30-2009, 05:54 AM
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finally!!!!

So i did more research online and i found out how to fix it. my problem was the harness. I put a multimeter to the housing and was supp. get a 5 volt reading, well i wasnt so i tested the wires further down and was getting it there so i cut it and rewired the harness. problem fixed!!!
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  #9  
Old 08-21-2009, 08:22 PM
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Would a higher voltage read higher temps from the IAT? I moved my IAT sensor near the filter and I am still getting temps around 110-120*F with my hood open.
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Old 08-21-2009, 08:57 PM
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Higher voltage like from the alternator? No. Sensors like that are typically given a very precise 5 or 10V regulated reference signal generated by the PCM. No sensor would be designed to vary its signal along with system voltage like that.
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