Question about 1993 Buick LeSabre
The transmission shifts strong into 1st gear and reverse but will not shift into second. Could this be due to a defective vacuum modulator? If so, is there a way to check the modulator or is the problem more likely to be in the transmission itself. How about a vacuum leak in the line from the intake manifold?
What is a vss
Posted on Jan 26, 2016
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
Posted on Mar 03, 2009
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Posted on Jan 02, 2017
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May 06, 2016 | 2002 Buick LeSabre
The engine and automatic transmission in this vehicles drive train are fully electronically controlled by a computer called the PCM (Power Train Control Module). Whenever a problem like this occurs the computer stores a record of the problem (there are of course some exceptions to this, like the fuel pump, engine coolant temperature sensor and MAF sensor for instance) in the form of a fault code in its memory, to read these fault codes you must have the systems memory scanned with a special tool. Once the fault code(s) are read you then must perform the appropriate diagnostic testing to find and resolve the problem(s) DO NOT REPLACE ANY PARTS UNTIL A TRAINED TECHNICAIN HAS DIAGNOSED THE PROBLEM TO AVOID SPENDING YOUR HARD EARNED MONEY ON PARTS THAT MAY NOT CORRECT THE PROBLEM
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