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Ram cummins diesel 3500 is not shifting into 2nd gear. Stuck in 1st. Could this code be the reason?

Vehicle: 2005 dodge ram 3500 Laramie cummins diesel.

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P2509 Power down data loss error

Yes it can affect the transmission , it probably causing the transmission relay to not work . without the power needed at the transmission solenoid assembly the output speed sensor will not work and as a result there is no shifting at all, P2509 start with the charging system. properly charging then go check the fuse for this , check the fuse for any open fuse and replace.

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