A harsh garage shift into Drive or Reverse may be noticed on some 2025-2026 Envista and Trax models equipped with the 6T40 automatic transmission (RPO MNK, MNH). The shift issue may be due to normally high solenoids in the control solenoid valve and Transmission Control Module assembly (TEHCM) having a valve over-travel condition resulting in contact or rupture of the solenoid screen. (Fig. 8)
Fig. 8
If this condition is suspected, test drive the vehicle to confirm the condition and check for any applicable DTCs. Diagnose any DTCs following the appropriate Service Information before continuing with any repairs.
If there aren’t any DTCs set, remove the control solenoid valve and Transmission Control Module assembly (TEHCM) from the transmission. Check solenoid valve locations 1. CBR1/C456 (NH), 2. C1234 (NH), and 7. Line (NH) (Fig. 9; shown below) to see if the valves are contacting the screen. (Fig. 10)
Fig. 9
Fig. 10
If a solenoid valve is found to be touching or pushing through the screen, replace the control solenoid valve and TEHCM (Fig. 11) as well as the control valve body.
Fig. 11
If it is determined that there is not any issue with any of the solenoid valves, continue to follow the diagnostics in the appropriate Service Information.
Refer to #PIP6095 for additional information.
– Thanks to Boyd Ortwine
