1999 Chevy Blazer shifts into 4 low

1999 CHEVROLET BLAZER
123,000 MILES • 6 CYL • 4WD • AUTOMATIC
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CROWBAR23
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when starting off when the truck has set for more that a hour it automaticly shifts into four low. i have to stop and put it in 2 hi. some times doing it twice within an 15 minute span befor it stops
Dec 10, 2009 at 12:31 PM
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RHALL77
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try disconnecting the 4 wheel drive modle for 30 seconds and plugging it back in and see if the problem goes away. you may need a new module. it is located in the lower passenger side kick panel. otherwise have it scanned for trouble codes
Dec 11, 2009 at 10:36 AM