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Changed ECU

Tiny
NEDLOB
  • MEMBER
  • 2003 KIA SORENTO
  • 3.5L
  • V6
  • 4WD
  • AUTOMATIC
  • 163,545 MILES
I changed out ECU and rewired B wire harnesses two wire had come out of harness. Now car will not go through all the gears. Will having ECU flashed fix this?
Monday, June 19th, 2017 AT 11:23 AM

4 Replies

Tiny
STEVE W.
  • MECHANIC
  • 13,452 POSTS
Possibly, what was wrong with the old ECU that made you change it out? Is the replacement new, used or a remanufacture unit?
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Monday, June 19th, 2017 AT 11:36 AM
Tiny
NEDLOB
  • MEMBER
  • 24 POSTS
Used from same year and type Sorento.
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Monday, June 19th, 2017 AT 12:56 PM
Tiny
NEDLOB
  • MEMBER
  • 24 POSTS
Two wires had corroded out of harness.
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Monday, June 19th, 2017 AT 3:11 PM
Tiny
STEVE W.
  • MECHANIC
  • 13,452 POSTS
If the old one is still working try putting it back in and see if you get the gears back. You may also want to have a transmission shop scan it, there are some codes that don't turn on the light but are still a problem.

If the old ECU is trashed then testing and a re-flash may help but you need to see if the transmission is being commanded through the gears as it shifts or not. It is possible you have a transmission issue as well.
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Tuesday, June 20th, 2017 AT 1:50 PM

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