2001 Hyundai Sonata 4 cyl Two Wheel Drive Automatic 87000 miles
2 1/2 half years ago I experienced a sudden loss of power in the shifting of the gears in the transmission, like the codes that were displaying 1) Loss of Vacuum & 2) input/output speed sensor failure. Fortunately I had 2 months of warranty left. Supposedly. The transmission had to be overhauled, at there expense. What happened was a loud thud hit simultaniously when the check engine lite came on. Pay attention here closely. The transmission then hung up in 3rd gear. Would not shift into overdrive or downshift to either 2nd or 1st gear. You had to take off in 3rd gear. Also, operating temperature does have some effect on the shifting, like the next morning when I needed to use it the check engine light had cleared itself and. When I took off the gears shifted just fine, until about 5 minutes of operation then the incident would happen again. Lock up in 3rd gear and check engine light came on again. Check engine light would always be on until the engine cooled down overnight and when you activated ignition the next morning check engine light would clear. After overhaul and 2 1/2 years later it does this again. I would like to know what really is going on here. What do I do? Do I have to get this transmission overhauled again? Please advise. Thanks so much!
Saturday, May 16th, 2009 AT 12:11 AM