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02 Malibu. Transmission problems? Or ECM problems?

Tiny
CFRESCH
  • MEMBER
  • 2002 CHEVROLET MALIBU
  • 175,000 MILES
My mother-in-law's car. Transmission problems. Hard shift between park-reverse-neutal-drive, and 1st and 2nd

p0753
p0758
p1860

Plugged in my scanner (to get the codes) and had the idea to erase the codes. It's given me some eratic codes also, once an egr code, cleared it, next an o2 code, cleared it, this time the 3 tranny codes and the intake air temp sensor. I'm starting to suspect the computer. Especially because the car shifted normal and perfect. Until the CEL came back on. Thoughts? The car's got a date with the dealer next saturday for their version of a diagnostic. It hasn't given me any of the same emission codes twice.
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Friday, May 18th, 2012 AT 1:07 AM

4 Replies

Tiny
CADIEMAN
  • MECHANIC
  • 3,544 POSTS
These are codes u will need a trouble tree to trace each 1.
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Friday, May 18th, 2012 AT 6:42 AM
Tiny
CFRESCH
  • MEMBER
  • 3 POSTS
I have been reading about the 20 way pass thru connector having iasues on this tranny. Does it sound as like this could be one of these cases?
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Friday, May 18th, 2012 AT 9:12 AM
Tiny
CADIEMAN
  • MECHANIC
  • 3,544 POSTS
Only way to find out is to replace that small harness or remove it and do a continuity test on each wire.
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Friday, May 18th, 2012 AT 6:50 PM
Tiny
CFRESCH
  • MEMBER
  • 3 POSTS
Actually ende, 1d up being simple.I was cleaning the egr passages and unplugged the air intake temp sensor. Forgot to plug it back in.I can't believe that interfered with the tranny. But it did. All is well now
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Saturday, May 19th, 2012 AT 12:03 AM

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