A single bump feeling may be felt when coming to a stop on some 2017-2022 Encore and Trax models equipped with the 6T40 6-speed automatic transmission (RPO MNH, MNK) and the Neutral Idle Control V5M calibration. (Fig. 20) The bump condition also may be present when releasing the brake pedal after coming to a stop and the transmission engages the 1-2-3-4 clutch.
Fig. 20
The slight bump condition is considered part of normal operation of the Neutral Idle Control feature that helps increase fuel efficiency. The condition will not be present if the transmission is shifted into Manual Mode, as Manual Mode disables the Neutral Idle feature. No repairs should be performed for this condition.
Neutral Idle Control Operation
Neutral Idle can only be commanded on when the transmission is operating in Drive with First Gear Engine Braking. When the brakes are applied and the vehicle speed, throttle position and transmission temperature are within the calibration defined limits, the Transmission Control Module (TCM) commands on Neutral Idle Control. The low and reverse clutch remains applied and the TCM reduces the pressure command to the 1234 PC Solenoid 5, which reduces the fluid pressure to the 1-2-3-4 clutch, allowing the clutch to slip. The resulting slip on the 1-2-3-4 clutch reduces the difference between the torque converter input speed and torque converter turbine speed, or torque converter clutch (TCC) slip speed. The reduced TCC slip speed reduces the engine load, which results in lower fuel consumption while Neutral Idle is commanded on.
For more information, refer to #PIP5924.
– Thanks to Bill Alley
