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Second gear is the default gear for "limp-in" mode. There is most likely a problem with your Powertrain Management system that is causing it to go into limp-in mode. The ONLY way to find out what is causing it, is to scan your onboard computer network and retrieve fault codes, which will tell you which of the many circuits and systems monitored by your computer is malfunctioning. Otherwise, you could GUESS for weeks and never get it right.
if its stay in second speed the computer put the tramission in limp mode because there a problem in the trasmission you need to get your van pass on a scanner to see the code it could simply be the input or output sensor there sensor on the transmission and to reset that simply disconnect the battery for 2 minute after you see your trams will change all speed let me no and thanks for using fixya
The transmission should have a vacuum line going to it. It needs this vacuum to shift into the next gear. Try locating it and connect a vacuum line from the carb to the trans.
it is going in limp mode, if your speedometer is not working will cause this,that would be a speed sensor,or the other two reasons would be the input or output sensors on the tranny
If it is staying in second gear, this is a default called the "Limp mode". When the computer sees a problem with the transmission it locks it in second gear so you can at least get home. This could be any number of problems. Your best bet is a GOOD mechanic.
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