I have a 1994 Lesabre that suddenly today stopped shifting from second gear into third. It shifts fine from 1st to second, (so its not stuck in second such as limp mode), no check engine light either, just stopped shifting to 3rd.
It's a gamble but it only costs about 12.00. Add 1 Qt. bottle of Lucas transmission additive. Run engine at idle in park for 20 to 30 minutes. test drive, Accelerate and decelerate a few times, If it does not shift.you're in for a repair job. LOL
Not a solution but a suggestion.. If you have a scanner hook it up and check for codes that way... it could be throtle positioning sensor
SOURCE: 1995 buick lesabre Speedo inop
I would have the transmission shop check out the transmission.
The transmission may have a soleniod issue.
SOURCE: 1993 Buick LeSabre transmission problem
No, the modulator on a 4t60e only will adjust shift feel, not shift points. Does the trans not shift up or go it to neutral instead of 2nd? Does you speedo work? The pcm needs a speed input to shift the trans. You might have a bad VSS
SOURCE: my 1995 buick lesabre check engine light is on
Take it to a real mechanic, not the phoney physics at the zone. The speed sensor will not respond if the car is not moving. May be an air flow sensor. They will go bad if it has ever been wet. They can be checked with a scan tool.
SOURCE: 2000 buick lesabre transmission - high rpm's in 1st to 2nd gear
SHift solenoid pressure switch
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