A Shift to Park message may be displayed on the Driver Information Center while the vehicle is in Park on some 2020-2023 Encore GX, Malibu; and 2021-2023 Trailblazer models. A no start condition also may be present along with DTC B000A (Park Switch – Shift Lever Position Not Plausible).
These conditions may be caused by a park switch malfunction inside the shifter assembly. Inspect the female terminals of the body harness connector that plugs into the shifter harness for any damaged or spread terminals. If the terminals are not spread or damaged, replace the shifter control. (Fig. 10) Be sure to use the specific General Motors pin drag tools for inspection.
Fig. 10
Refer to Transmission Control Replacement (without Base) in the appropriate Service Information.
In order to disconnect the automatic transmission range selector lever cable, remove the cable bolt along with the range selector lever cable from the transmission control. The cable bolt is not separated from the range selector lever cable.
During installation, hold the face of the transmission control main shaft bolt in the slot of the mounting bracket as the nut is torqued to ensure it remains seated and does not rotate out of the slot. (Fig. 11) If not seated properly, it may result in a loose shifter feel or rattle sound.
Fig. 11
After installation, be sure to adjust the range selector lever cable.
For additional details, including parts information, refer to Bulletin #23-NA-119.
– Thanks to Marty Leach, Frank Jakubiec and Jonathan Johnson
Updated February 23, 2024
