Changed ecu

2003 KIA SORENTO
163,545 MILES • 3.5L • V6 • 4WD • AUTOMATIC
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NEDLOB
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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?
Jun 19, 2017 at 11:23 AM
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STEVE W.
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Possibly, what was wrong with the old ECU that made you change it out? Is the replacement new, used or a remanufacture unit?
Jun 19, 2017 at 11:36 AM
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NEDLOB
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Used from same year and type Sorento.
Jun 19, 2017 at 12:56 PM
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NEDLOB
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Two wires had corroded out of harness.
Jun 19, 2017 at 3:11 PM
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STEVE W.
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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.
Jun 20, 2017 at 1:50 PM