Transmission Limp Home Mode - Dodge RAM 1500 2018 Diesel Supplement

the "Note" under "Torque Converter Clutch" in this sec-
tion). On Pickup models with 68RFE transmission, top
overdrive gear is also inhibited until the transmission fluid
is warm, and during extremely cold temperatures (-16°F
[-27°C] or below), operation may briefly be limited to first
and direct gears only. On trucks with AS69RC transmis-
sion, fifth and sixth gears may be inhibited briefly on cold
starts below 41°F (5°C), and during very cold temperatures
(-4°F [-20°C] or below), operation 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

Transmission function is monitored electronically for ab-
normal 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 damag-
ing 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 recom-
mend that you visit your authorized dealer at your earliest
possible convenience. Your authorized dealer has diagnos-
tic equipment to assess the condition of your transmission.
If the transmission cannot be reset, authorized dealer
service is required.
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