I have a 2003 duramax I just purchased the truck drove home ran and drove great no issues what so ever the next day I got in the truck to leave the house put it in drive and it locks it's self in neutral with no forward gears flashes shift range enhibited and has code p0872 so far I've replaced ignition nsbu switch checked all grounds new spin on filter and a new tfps switch still has same symptoms I'm at a loss and need help
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