128 STARTING AND OPERATING may briefly be limited to third gear only. During this condition, the ability of the vehicle to accelerate under heavily loaded conditions may be reduced. In all cases, normal operation will resume once the transmission temperature has risen to a suitable level. Transmission Limp Home Mode 4. Wait approximately 10 seconds. 6. Shift into the desired gear range. If the problem is no longer detected, the transmission will return to normal operation. 5. Restart the engine. NOTE: Even if the transmission can be reset, we recommend that you visit an authorized dealer at your earliest possible convenience.
An authorized dealer has diagnostic equipment to assess the condition of your transmission. If the transmission cannot be reset, authorized dealer service is required. Electronic Range Select (ERS) Operation Transmission function is monitored electronically for abnormal conditions. If a condition is detected that could result in transmission damage, Transmission Limp Home Mode is activated. In this mode, the transmission remains in THIRD gear regardless of which forward gear is selected. If an AS66RC/AS69RC equipped truck enters Transmission Limp Home Mode at highway speeds, it will initially engage FIFTH gear, until the vehicle slows to a speed where THIRD gear can be engaged.
PARK, REVERSE, and NEUTRAL will continue to operate. The Malfunction Indicator Light (MIL) may be illuminated. Transmission Limp Home Mode allows the vehicle to be driven to an authorized dealer for service without damaging the transmission. Electronic Range Select 1 — GEAR “+” Switch 2 — GEAR “–” Switch To exit ERS mode, simply push and hold the ERS “+” switch until the gear limit display disappears from the instrument cluster. The ERS shift control allows the driver to limit the highest available gear when the transmission is in DRIVE.
For example, if you set the transmission gear limit to FOURTH gear, the transmission will not shift above FOURTH gear, but will shift through the lower gears normally. WARNING! Do not downshift for additional engine braking on a slippery surface. The drive wheels could lose their grip and the vehicle could skid, caus ing a collision or personal injury. You can switch between DRIVE and ERS mode at any vehicle speed. When the gear selector is in the DRIVE position, the transmission will operate automatically, shifting between all available gears. Tapping the ERS “-” switch will activate ERS mode, display the current gear in the instrument cluster, and set that gear as the top available gear.
Once in ERS mode, tapping “-” or “+” will change the top available gear. In the event of a momentary problem, the transmission can be reset to regain all forward gears by performing the following steps: NOTE: To select the proper gear position for maximum deceleration (engine braking), simply push and hold the ERS “-” switch. The transmission will shift to the range from which the vehicle can best be slowed down. 1. Stop the vehicle. 2. Shift the transmission into PARK. 3. Turn the ignition to the OFF position.