Question about Chevrolet Silverado 3500HD

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2004 chevy silverado 3500 tranny stuck in second gear. no codes and no _ under P R D 3 2 1

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  • jreid978 Jan 30, 2010

    have an 04 silverado 3500. sometimes ill take off from a light or stop sign and the truck starts off in second and stays in second. i can start the truck in P and in N but does not show what gear the truck is in. i have already changed the nsbu switch and it went away for a bit but now is back. i heard it could be the speed sensor or maybe even the comp. when it happens and i get home i turn the truck off and leave it overnight when i come out in the morn it is fine again.

  • jreid978 Jan 31, 2010

    sounds good thanks alot.

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  • Chevrolet Master
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The "2nd gear" default problem you are experiencing is referred to as "limp home mode" The transmission will continue to run in 2nd gear so you are not stranded and are able to get to a service area or home.
The reason the transmission is stuck in 2nd gear is due to an ecu failure or wiring problem that has occurred. The transmission control module can no longer control the transmission or does not know what state the transmission is in.
Unfortunately, you will have to have the transmission diagnosed and serviced. Most likely it is not a serious problem and should be able to be diagnosed an fixed within a short period of time.
Good luck.

Posted on Jan 30, 2010

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  • Chevrolet Master
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Engage the Parking Brake.
Hopefully the Shift Cable has not broken=snapped. If it hasn't then:
The shift cable most likely has become loose at the shift lever connection located on the transmission. Go to the transmission and inspect the shift cable to shift lever connection. The shift lever goes into the transmission. IF it is loose/not tight enough, you should be able to shift the lever by hand without the shift cable moving OR you should be able to advance/retrac the cable by hand without moving the shift lever.
Disconnect the shift cable to shift lever connections.
Move the Shift Lever into the Park Indent position. Pull on the Cable and the __ should reappear in the PRND321 window. With a Partner helping: pull the cable until the __ is under the P. Reconnect the shift cable to the shift lever and retighten the connections down to approximately 100 in-lbs.
This should take care of the problem. Test the engine start-up by starting the vehicle in Park and also Neutral, as these are the only two positions it should start in.
Let me know if this helped, or if you have any additional information or questions. Feel free to contact me at FixYa.com!

Posted on Jan 30, 2010

  • Patrick Rayome Jan 30, 2010

    When was the last time the Transmission Fluid and Filter were changed? If it has been over 35K then the problems you are having is a good sign that this needs to be done.

    Have you checked the cable or lever?

    The "_" not visible is the key to this. This is directly connected to the cable connection.

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