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STARTING AND OPERATING
Transmission Limp Home Mode
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 FOURTH gear (for 68RFE transmission) or THIRD gear
(for AS69RC transmission) regardless of which forward
gear is selected. If an AS69RC-equipped truck enters 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. Limp Home mode allows the vehicle
to be driven to an authorized dealer for service without
damaging the transmission.
In the event of a momentary problem, the transmission
can be reset to regain all forward gears by performing the
following steps:
1. Stop the vehicle.
2. Shift the transmission into PARK.
3. Turn the ignition OFF.
4. Wait approximately 10 seconds.
5. Restart the engine.
6. Shift into the desired gear range. If the problem is no
longer detected, the transmission will return to
normal operation.
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
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.
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 GEAR “-”
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 the GEAR “–”
or GEAR “+” switch will change the top available gear.
Electronic Range Select
To exit ERS mode, simply push and hold the GEAR “+”
switch until the gear limit display disappears from the
instrument cluster.
NOTE:
To select the proper gear position for maximum deceler
-
ation (engine braking), simply push and hold the GEAR “–”
switch. The transmission will shift to the range from which
the vehicle can best be slowed down.
1 — GEAR “+” Switch
2 — GEAR “–” Switch
WARNING!
Do not downshift for additional engine braking on a
slippery surface. The drive wheels could lose their grip
and the vehicle could skid, causing a collision or
personal injury.
Transmission
Gear Limit
Display
1
2
3
4
5
6
D
Actual Gear(s)
Allowed
1
1-2 1-3 1-4 1-5 1-6 1-6
CAUTION!
When using ERS for engine braking while descending
steep grades, be careful not to overspeed the engine.
Apply the brakes as needed to prevent engine
overspeed.
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