2003 Buick Rendezvous Transmission will not shift under loa

2003 BUICK RENDEZVOUS
57,000 MILES • 6 CYL • FWD • AUTOMATIC
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RMELLONE
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When I drive the car with no load it shifts fine, once I put any weight in the car the transmission will not shift out of 2nd gear. I checked the fluid level and it is fine. It shows that I have a sensor problem when I have taken it in. I would like to know if changing the sensor will fix the problem
Nov 7, 2008 at 11:23 AM
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JNOVACK
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what sensor is it showing there is a trans control selinoid and trans control module that controls the shifting also the speed sensor
Nov 7, 2008 at 11:33 AM
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RMELLONE
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I think they said it was number 1 sensor.
Nov 7, 2008 at 11:43 AM
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JNOVACK
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it sounds like the 1st-2nd shift pressure valve selinoid that needs to be replaced
Nov 7, 2008 at 11:57 AM
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RMELLONE
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but why would it only fail when there is a load in the car and any other time it works fine
Nov 7, 2008 at 12:01 PM
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JNOVACK
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because it senses an increase of pressure and with the execes pressure it fails
Nov 7, 2008 at 5:49 PM