Question about Oldsmobile Silhouette

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I have a 2001 oldsmobile silhouette that will not allow the transmission to shift into overdrive. It will function properly in "D", but will not shift into OD even when it is selected on the gearshift. What module instructs the transmission to shift into OD?

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Posted on Jan 02, 2017

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SOURCE: 1998 Ford Explorer

Have the vehicle scanned for trouble codes,and diagnose any codes present.If no codes,or as an alternative,i have at work a Zoom Technologies box that allows me to monitor transmission function as being commanded by the vehicle's PCM,or manually override the vehicle,and take manual control of the transmission.It is an expensive diagnostic tool.If the trans is commanded manually,and 4th gear doesnt happen,then you're looking at electric solenoids on the valve body,or possibly damaged servos.Servos can be accessed with the trans in the vehicle,and inspected.If the servos aren't the culprit,then it is likely an internal problem.

Posted on Jul 09, 2008

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SOURCE: Transmission

ljbbw, I have somewhat the same problem. I have a 95 ZJ and mine starts out in 2nd gear, OD light always on for the OFF selection, and whatnot. I found out from a local garage (waiting for a 2nd opinion) that 1st gear no longer exists on my transmission, I have to start in 2nd from a full stop or low speed roll, and then shift into 3rd/Drive, but no OverDrive, so at like 60 mph I hit 2700 rpm and it wont up or downshift. Its potential it COULD be the torque converter off as they thought it could have been my issue, but who knows, get it looked at before something really goes wrong?

Posted on Oct 14, 2008

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SOURCE: 92 lexus SC300 overdrive off light stays on. Will go off at wil.

tcm/ecm malfunction

Posted on Dec 22, 2008

  • 1 Answer

SOURCE: f150 transmission neutralizes when shifts to overdrive

I have that exact same truck and transmission and My Transmission did the exact same thing about a year ago and there was some kind of snap ring inside the transmission that broke. I originally thought it had to be an electirical problem because the truck shifted fine until OD or if i turned OD off. The 4r70w is a light transmission and i would suggest you have a shift kit put in and they make a heavier kit to beef it up.. Sorry its probably not the new you were looking for.

Posted on Apr 15, 2009

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SOURCE: transmission on a 1983 f100 with a overdrive

The best way to adjust it is to hook a pressure gage to the TV pressure port located on the left side of the transmission just ahead of the linkage. You want it to be a zero at idle but pressure starts moving as soon as you move the linkage.

Posted on Jun 14, 2009

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