2002 Dodge Ram will not shift out of 2nd gear
After I replaced the PCM due to an error p0601, the truck will not shift out of 2nd gear. It can go into reverse, neutral, park, and manually into 1st and 2nd but in drive, it will stick in 2nd gear and the rpms will just keep going up until I release the gas pedal. Putting the original PCM in fixes the problem but the p0601 error code comes back. Please help.