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My ´92 Chevy with 6.2 L Diesel engine is equipped with a 4L80 transmission. The mileage is approx. 200,000. When the engine/trans. is warm (after 10-20 min. driving), it starts shifting from lock-up to 3rd, back and forth. Simultaniously the service engine soon light flashes.

I changed the fluid and filter, no succes. There was no burned smell from the old liquid and no metaldust/parts on the magnet. My mechanic read out the codes, and nothing there either. It shifts very smoothly all the way up to 4th (lock-up).

I suspect an electrical problem, but don't know where to look? Does anybody have a suggestion?


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