Conditions for Setting the DTC
WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
DTC P1816 sets when the TCM detects one of the following conditions for 13 seconds.
- PARK/NEUTRAL indicated with a 1st gear ratio.
- PARK/NEUTRAL indicated with a 2nd gear ratio.
- PARK/NEUTRAL indicated with a 3rd gear ratio.
- PARK/NEUTRAL indicated with a 4th gear ratio.