Conditions for Setting the DTC
WARNING: This page is about a different car, the 2018 Chevrolet Suburban 3500 HD. However, it is still accessible from the selected car via links, so may be relevant.
P182E
The internal mode switch does not indicate a valid Park, Reverse, Neutral or Drive range gear position.
P1915
The internal mode switch Park/Neutral circuit does indicate Park or Neutral during engine start.