Replaced modular ran for about a week would not start replaced it with a new one only started once computer says it is stuck in 3rd gear what could cause?
It could be that your transmission linkage cable between your cabin gear select/shifter and your transmission has become disconnected.
another cause of sticking in a gear would be a torque converter (basically, the "clutch" of an auto transmission) gone bad. first step to check on the transmission physical health is to check the tranny fluid. it should be a very bright, transparent red- free of smell. if it is crimson, dark, or opaque, and/or smells almost "fishy", change the fluid immediately, and dont expect the transmission to hold out for too much longer, if the fluid has that smell and/or is full of metallic specs.
if you have a lot of miles on the vehicle, you may want to have a shop change the automatic transmission fluid anyway, and check for any metal shavings in the drained fluid.
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