2010 Jeep Grand Cherokee Owner's Manual - Page 252

STARTING AND OPERATING 251 3. Turn the engine off, and be sure to turn the ignition higher speeds under heavier acceleration. This may result in a slightly different feeling or response during switch to the LOCK position. normal operation in high gear. When the vehicle speed 4. Wait approximately 10 seconds, then restart the endrops below a calibrated speed, or during acceleration, gine. the clutch automatically and smoothly disengages. The feature is operational in Overdrive and in DRIVE. 5. Move the shift lever to the desired gear range. If the problem is no longer detected, the transmission will NOTE: return to normal operation. If the problem persists, • The torque converter clutch will not engage until the transmission fluid and engine coolant are warm [usuPARK, REVERSE, and NEUTRAL will continue to operally after 1 to 3 miles (1.6 to 4.8 km) of driving]. ate. Only second gear (3.7L engine) or third gear (5.7L Because the engine speed is higher when the torque engine) will be available in the DRIVE position. Have the converter clutch is not engaged, it may seem as if the transmission checked at your authorized dealer as soon transmission is not shifting into Overdrive when cold. as possible. This is normal. Manually shifting (using the ERS shift Torque Converter Clutch control) between 4 (direct gear) and 5/D (Overdrive A feature, designed to improve fuel economy, has been gear) positions will demonstrate that the transmission included in the automatic transmission on your vehicle. is able to shift into and out of Overdrive. For vehicles A clutch within the torque converter engages automatiwith 5.7L engines (which have two Overdrive gears), cally, at a calibrated speed, at light throttle. It engages at 5