Conditions for Setting the DTC: P1816: Notes
WARNING: This page is about a different car, the 2008 GMC Sierra and 2008 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
The TCM detects one of the following conditions for 6 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.