2000 GMC Sonoma Service Engine Soon/lost 4th gear

2000 GMC SONOMA
82,000 MILES • 4 CYL • 2WD • AUTOMATIC
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DWARD1949
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I bought a 2000 Sonoma a month ago. Today on the freeway running about 70 the Service Engine Soon light came on, a few minutes later it downshifted to 3rd. Fearing the worst I got off the freeway and took side streets the rest of the way home. It ran ok, shifting was okay, just wouldn't go to 4th.
Ideas?
Jan 25, 2010 at 3:50 PM
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HMAC300
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take this to a trans shop where they an pull the code out of it. I is an trans code so if there is osmething wrong it may tell you but it might be teh trans will need a rebuild.
Jan 25, 2010 at 6:26 PM