1999 Dodge Durango Shifting Issues

1999 DODGE DURANGO
V8 • 4WD • AUTOMATIC
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OMASKI
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Driving the truck the RPM jumps up and down and sometimes misses the gear and or dies but the funny part is it will only do this in drive, if i shift it to 1 or 2 it has no issues at all and thats what is stumping me, i want to say its a trans issue but a shop says i need a new wireing harness
Apr 24, 2015 at 9:18 AM
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HMAC300
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if the shop says you need anew wiring harness I assume you already had this checked. so I would go with that. it may be a bad harness or connection problem.
Apr 24, 2015 at 9:30 AM
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OMASKI
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i live out in nowhere and this shop is a old guy that dont got the best rep so i thought i would seek more advice if you might have any ideas
Apr 24, 2015 at 9:36 AM
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HMAC300
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us oldguys aren't any good? it has to be scanned for codes to see what the code if any is. the harness operates the trans electrically so it may be trying to find out what gear it is in. check fuses and relay in pic then check ground on lh front of engine. if that doesn't help it has to be scanned for codes. and check harness at trans for connection, bent pins etc. and whether or not it has rubbed through someplace.
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Apr 24, 2015 at 12:18 PM
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OMASKI
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ran the codes and got P0123 Throttle Pos Sens Voltage Hi, that is why its flipping out but will it fix it if i just replace the senserr? or will that still send to much voltage to the new one? if so how can i fix that?
Apr 24, 2015 at 6:36 PM
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HMAC300
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cold be defective wiring , tp sensor defective connectors or a pcm. see pic
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Apr 25, 2015 at 5:33 PM