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I have a 2003 Tahoe it's in the shop and they can't find the problem. I took it in for the transmission, when I start it it jumps forward also sometimes when I put it in reverse it will just rev up and I have to put it back in park and then reverse again also it's not shifting right from 1st to 2nd.
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A scanner can diagnose for an electrical problem. If nothing is detected then usually it's mechanical. About the only thing internally that could break and cause no forward gears while having reverse would be the input gear on the rear planetary set.
good old-- needs a new transmission answer to a problem--
codes do not recommend a new transmission but give causes for the problem
like servo, solenoid, pressure , torque converter clutch etc, possible mechanical failure
with the transmission operating fine after 10 mph there is no mechanical problems requiring a new transmission so it is electronic issues that have to be addressed
the issues could be a simple broken vacuum hose to the transmission actuator, wiring connections ( corroded , water , loose broken wires)
Take it to an accredited professional transmission specialist shop and have a proper diagnosis and quote done
If battery and alternator were tested and good then the wiring in back of the alternator must be caked with corrosion or the battery cables are full of resistance.
If it backs up but won't go forward it's an internal transmission problem. You'll want to have a transmission shop do a complete rebuild. They always do that because taking it out and reinstalling it is such a big deal. (The transfer case merely splits the power between the front differential and rear differentials when you go into 4WD; it sends it only to the rear differential for 2WD). Shop around for prices and compare warranties.
95% of the time when multiple things like that happen it can be linked back to a blown fuse. Thats where i would start first because with bare wires touching or grounded out it is a good chance it blew a fuse.
abs light is on and there is a motor running underneath on the driverside
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