Okay on Reddit someone told me to do this. I think it works. Just press the start button for a second (without brake pedal) and preheat coil symbol comes on the dash (as well as many other lights). After a few seconds the preheat coil light goes out. At that time step on the brake and press start again. It fired right up! It's weird because I don't get an "engine pre-heat in progress" message or anything.
That message may not even exist in the software anymore, since RAM just went back to glow plugs from the friggin "Grid Heater".
Since U researched and know what U need to do, problem solved. WHAT is also displayed may depend upon what Instrument cluster you have.
ADDED: Surprised RAM not put this out somwhere, in manual or something. Even on the old Dueces, as in M35A2 trucks, we had to go to 1st ignition and wait for the plugs to heat listening to dat friggin noisy buzzer.
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OP: !!!
out of 2025 RAM HD Manual: (There are 3 instrument clusters can be in your truck, that may affect displayed messages/lights) (see RAM Manual for yer truck)
Keyless Enter ‘n Go™ Starting Procedure
— Engine Manifold Air Temperature
Below 32°F (0°C)
NOTE:
The temperature displayed in the instrument cluster
does not necessarily reflect the engine manifold
air temperature ð page 104. When engine
temperatures fall below 32°F (0°C) the Wait To Start
Indicator Light will remain on for a few seconds while
the glow plugs preheat.
Follow the steps in the “Normal Starting” procedure
except:
1. Pushing the ENGINE START/STOP button with the
driver’s foot on the brake will move the ignition
from OFF or ACC to ON/RUN, and will illuminate
the Wait To Start Indicator Light. The engine will
not immediately crank, this is normal operation.
2. The Wait To Start Indicator Light will remain on
for a period of time that varies depending on the
engine temperature.
3. While the Wait To Start Indicator Light is on, the
instrument cluster will additionally display a gauge
or bar whose initial length represents the full Wait
to Start time period. Its length will decrease until
it disappears when the Wait to Start time has
elapsed.
CAUTION!
If the Water in Fuel Indicator Light remains on,
DO NOT START the engine before you drain
(Continued)
--------------------------------------------------------------
4. After the engine Wait To Start Indicator Light goes
off, the engine will automatically crank.
CAUTION!
Do not crank the engine for more than 25
seconds at a time or starter motor damage
may result. Turn the ignition switch to the OFF
position and wait at least two minutes for the
starter to cool before repeating start procedure.
5. After engine start-up, check to see that there is oil
pressure.
6. Release the parking brake and drive.
NOTE:
● Engine idle speed will automatically increase to
1,000 RPM and engage the Variable Geometry
Turbocharger at low coolant temperatures to improve
engine warm-up.
● The engine will not automatically crank after the
engine Wait To Start Indicator Light goes off if a door
or the hood is ajar.
EXTREME COLD WEATHER
The Cummins® Turbo Diesel engine is equipped with
several features designed to assist cold weather
starting and operation:
● The engine block heater is a resistance heater
installed in the water jacket of the engine just above
and behind the oil filter. It requires a 110–115
Volt AC electrical outlet with a grounded, three-wire
extension cord.
NOTE:
The engine block heater cord is a factory installed
option. If your vehicle is not equipped, heater cords are
available from an authorized Mopar® dealer.
● A 12 Volt heater built into the fuel filter housings aid
in preventing fuel gelling. It is controlled by a built-in
thermostat.
● A glow plug system both improves engine starting
and reduces the amount of white smoke generated
by a warming engine.
----------------------------------------------------------------------
STARTING PROCEDURE — ENGINE MANIFOLD
AIR TEMPERATURE BELOW 32°F (0°C)
NOTE:
The temperature displayed in the instrument cluster
does not necessarily reflect the engine manifold
air temperature ð page 104. When engine
temperatures fall below 32°F (0°C) the Wait To Start
Indicator Light will remain on for a few second while the
glow plugs preheat.
Follow the steps in the “Normal Starting” procedure
except:
1. The Wait To Start Indicator Light will remain on
for a period of time that varies depending on the
engine temperature.
2. While the Wait To Start Indicator Light is on, the
instrument cluster will additionally display a gauge
or bar whose initial length represents the full Wait
To Start time period. Its length will decrease until
it disappears when the Wait To Start time has
elapsed.
CAUTION!
If the Water in Fuel Indicator Light remains on,
DO NOT START the engine before you drain
the water from the fuel filters to avoid engine
damage.
3. After the Wait To Start Indicator Light goes off,
place the ignition switch in the START position. Do
not press the accelerator during starting.
CAUTION!
Do not crank the engine for more than 25
seconds at a time or starter motor damage
may result. Turn the ignition switch to the OFF
position and wait at least two minutes for the
starter to cool before repeating start procedure.
4. After engine start-up, check that the Oil Pressure
Warning Light has turned off.
5. Release the parking brake and drive.
NOTE:
● Engine idle speed will automatically increase to
1,000 RPM and engage the Variable Geometry
Turbocharger at low coolant temperatures to improve
engine warm-up.
● Automatic equipped vehicles with optional Keyless
Enter ‘n Go™ – If the start button is pushed once
while in PARK with the ignition off and driver’s foot
on the brake pedal, the vehicle will automatically
crank and start after the Wait to Start time has
elapsed. If it is desired to abort the start process
before it completes, the driver’s foot should be fully
removed from the brake pedal prior to pushing the
start button again in order for the ignition to move
directly to off.
