Transmission will not shift

Tiny
VANCE24
  • MEMBER
  • 2007 CHEVROLET COBALT
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 130,000 MILES
Boosted the battery in my car and now it will not shift into overdrive. I can only drive 60 km/hr at about 3000 rpm. Any ideas?
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Wednesday, June 8th, 2016 AT 2:08 PM

7 Replies

Tiny
KEN
  • ADMIN
Hey VANCE24,

When you jumper the battery did you by chance jump it backwards of a second? If so the computer has been knocked out and needs replacement. If not, check all fuses, here is a guide to help you.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Let me know what you find.

Best, Ken
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Saturday, June 11th, 2016 AT 1:52 PM
Tiny
VANCE24
  • MEMBER
Brought it to a mechanic, couldn't find any bad fuses. He hooked up a scanner and thinks that it may be a transmission control module located inside or around the transmission. Now I have to bring it to a tranny guy. This make sense?
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Sunday, June 12th, 2016 AT 4:35 AM
Tiny
MHPAUTOS
  • EXPERT
As ken has mentioned if the battery was hooked up reverse polarity even just a battery flash, this can burn out circuits in the pcm and other control modules, the scan should give info on what is at fault, if this mechanic is not sure by all means get a second opinion before doing anything, if you can post any codes set that will help up look a little deeper into this problem.
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Sunday, June 12th, 2016 AT 6:11 AM
Tiny
VANCE24
  • MEMBER
PO 446,496,602,603, po62f, 722,741,757,973,974,1810,1816,1818,446,496,602,603, 62f, 705,716,722,741,742,751,752,756,843,973,974,977, p2534,2764, u0073, u0100
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Wednesday, June 15th, 2016 AT 4:31 PM
Tiny
KEN
  • ADMIN
Yep it looks like the computer is burned up, you will need a new or used one sorry, it happens. Let me know after you have replaced it.
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Wednesday, June 15th, 2016 AT 8:13 PM
Tiny
VANCE24
  • MEMBER
For some reason, after doing the scan, then erasing all the codes before unplugging, everything is working normal.
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Thursday, June 16th, 2016 AT 2:04 AM
Tiny
MHPAUTOS
  • EXPERT
Well that is odd, normally I would expect that the pcm would be toast, but if it is working just test drive and if there is no problem your on a winner, just keep us informed as to how it goes.
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Thursday, June 16th, 2016 AT 2:26 AM

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