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Automatic Transmission thinks it is a Manual Transmission

BillM1965

By BillM1965
in Ask A GM Technician

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BillM1965 Enthusiast

BillM1965

Posted
Posted

Yesterday evening driving home from work I ran out of gas due to a bad fuel gauge which showed 1/4 full. Now I cannot shift into D any more I can only drive the truck by manually shifting gears. Any ideas what has caused this issue.

 

I checked the trans fluid and it is full and clean.

 

All other gears work with no problems but I do not want to have manually shift gears for much longer because I have a heavy foot and am afraid that I will cause damage to the transmission if I shift too late or too soon.

 

The truck is 2007 Sierra 1500 Z71 4X4.

 

When I shift to drive the transmission acts like it is in neutral.

 

I have scanned the computer for fault codes and nothing shows up on my scanner.

SouthernSilveradoGuy85 Senior Enthusiast

SouthernSilveradoGuy85

Posted
Posted

I would disconnect the battery fro a few minutes and reconnect to reset the computer. If that doesn't work then take it somewhere that will scan for codes. If nothing shows up you need to just take it to a transmission shop. It's most likely electronic or wiring. It doesn't sound like it's anything mechanically wrong, but I'm not expert so I could be wrong.

Jsdirt Senior Enthusiast

Jsdirt

Posted
Posted

Did you get towed home? Sounds like the tow company screwed up your linkage. Call them and make them fix it.

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