Automatic transmisson

Tiny
JDELLOSI
  • MEMBER
  • 2002 HYUNDAI SONATA
  • 6 CYL
  • FWD
  • AUTOMATIC
My 2002 hyundai sonata shifted with a thud and is stuck in third gear now, all this not more than 30 miles after getting the battery swapped out any thoughts?
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Tuesday, March 15th, 2011 AT 4:57 AM

4 Replies

Tiny
CARADIODOC
  • EXPERT
Sounds like you have a computer-controlled transmission. The computer learns the characteristics of the wear in the clutch packs and updates the shift schedules to maintain a nice crisp shift. That memory was lost when the battery was disconnected. If your system is like the Chrysler system, there was likely some slippage during a shift so the transmission went to a default condition that allows you to drive slowly to a repair shop. Your computer has to relearn the shift characteristics. There's a good chance that relearn procedure is partly completed and once you turn the ignition switch off and restart the engine, that will take it out of the default mode. The slippage during shifts will likely disappear shortly and it will stop going into default.
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Tuesday, March 15th, 2011 AT 5:51 AM
Tiny
JDELLOSI
  • MEMBER
Ok went and started the car and drove around the block got to third stuttered and stayed in third, pulled over started the car again and it was back in first but still did it again goin down the street?
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Tuesday, March 15th, 2011 AT 6:13 AM
Tiny
CARADIODOC
  • EXPERT
If this continues it's time to visit a transmission specialist. They will connect a scanner to read the stored diagnostic fault codes in the Transmission Computer, then they will be able to suggest a course of action. In the meantime, one thing you might try is accelerating harder than normal, then letting off the gas just as it is about to shift into the gear where the problem occurs. This would be similar to easing up on the pedals just when you want to shift your bicycle to a different gear. The reduced torque will prevent any slippage in the clutch packs. Once firmly locked in gear, you can accelerate again. If slippage really is the problem, this trick will often allow you to get to all the gears and be able to drive on the highway until you can get to a repair shop. If the problem still acts the same way, there could be a sensor problem or, rather than clutch plate wear, the slippage could be due to a leaking seal in one of the clutch packs. That would cause the slippage to continue as long as it is in that gear, not just as it's going into that gear.
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Tuesday, March 15th, 2011 AT 7:34 PM
Tiny
CHODS62
  • MEMBER
My car same year as yours, did the same thing to me on the highway. It was a bad transmission solenoid
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Saturday, May 28th, 2011 AT 10:30 AM

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