Trans defaults to park and back, abs light. - Page 2 - 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 5.3L V8 Engine and Drivetrain > OEM Issues

OEM Issues Original Equipment Repairs and/or Problems

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  #11  
Old 09-10-2018, 08:41 AM
TB-Al's Avatar
TB-Al TB-Al is offline
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2007 Chevy TrailBlazer LS
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The transmission position sensor tells the PCM computer what you want to do with the transmission. The PCM computer then talks to the ECM computer and the ECM tells the PCM what solenoids to activate depending on rpm, throttle position, etc. I can't guarantee that is the issue but nothing you've said would indicate otherwise and it sure seems to me to fit the symptoms. A failing switch is telling the computers that you are moving the shift lever to these positions even though you aren't.
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  #12  
Old 09-10-2018, 01:44 PM
miketexas miketexas is offline
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There is also a manifold pressure switch on the valve body inside the pan that tells the computer what position the manual valve is in.
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