I had an '03 LeSabre. My son the mechanic printed out a bulletin that told about an electrical connection (plug) that would corrode and give failing transmission symptoms. Plugging and unplugging the plug was often enough to refurbish the connection. My '03 once acted like it had been shifted into neutral and coasted nearly to a stop when it started acting normal again. Only did it that one time.
Here's some of the text from the bulletin:
Applies to 1992-1994 Buick LeSabre Hydra-matic 4T60-E (RPO M13)
Condition:
Some owners may experience one or more of the following intermittent conditions:
Loss of drive (neutral condition) on highway while in fourth gear.
Erratic upshifts and downshifts at steady throttle angles without a malfunction indicator light (service engine soon) illuminated.
First and second gear only (no third or fourth gear)
First and fourth gear only (no second and third gear)
Cause: These intermittent conditions may be caused by an intermittent short to ground on the "A" or "B" shift solenoid wiring between the ECM/PCM and the transaxle or an internal electrical condition in the transaxle. In most cases, these conditions are not caused by a hydraulic or mechanical condition in the transaxle. end of text
I don't want to imply that I'm a transmission mechanic. I know absolutely nothing about them.
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