With the outside temperature below freezing, the truck will not shift into Auto 4WD, 4L or 4H. I hear a clunking noise but the 4wd does not engage. I brought the truck into the garage and warmed it up, and then everything would shift fine. Once the truck was back outside and cooled down, I had the same problem with the shifting into Auto 4WD, 4L or 4H. Any ideas as to what the problem is would be very much appreciated.
Possible actuator motor issue have it tested.
SOURCE: service 4wd message appears when shifting into 4h
could be but chevy truck have a common problem with the 4wd system
you have to replace some kind of actuator mounted in the mechanism inside the motor the one is attached to the transfer case to switch the 4wd system,you need to get the motor out and work with it in the work bench for furter information about it explain to you dealership parts guy cost around 130 bucks and if you do it your self mark the position of the sprocket or gear when you open it to avoid mistakes and have to take out again because the gear teeths have a position to make the device fit back on the transfer case
From N to 4H
Stop the vehicle completely, place the
transmission in "N" (Neutral) and depress
the brake pedal and the clutch pedal fully
(if equipped), then push in and turn the
switch to shift into "4H".
From 4H to 4H LOCK
You can operate the transfer switch either
when the vehicle is stopped or while the
vehicle is moving.
Position the front wheels straight ahead
and turn the switch to shift into "4H LOCK".
If the vehicle is moving, we recommend
that the speed be less than 100 km/h (60
mph) during this operation.
NOTE:
• When shifting between the transfer
switch position and the transfer gear
position is unmatched, all 4WD indicators
will blink and the buzzer will sound.
• If it is difficult to shift between "4H" and
"4H LOCK" while the vehicle is moving,
try accelerating and decelerating your
vehicle several times after turning the
transfer switch. Be sure to wait until traffic
conditions allow you to accelerate and
decelerate safety before using this procedure.
From 4H LOCK to 4L LOCK
Stop the vehicle completely, place the
transmission in "N" (Neutral) and depress
the brake pedal and the clutch pedal fully
(if equipped), then push in and turn the
switch to shift into "4L LOCK".
From 4L LOCK to 4H LOCK
Stop the vehicle completely, place the
transmission in "N" (Neutral) and depress
the brake pedal and the clutch pedal fully
(if equipped), then push in and turn the
switch to shift into "4H LOCK".
From 4H LOCK to 4H
You can operate the transfer switch either
when the vehicle is stopped or while the
vehicle is moving.
Position the front wheels straight ahead
and turn the switch to shift into "4H". If the
vehicle is moving, we recommend that the
speed be less than 100 km/h (60 mph) during
this operation.
NOTE:
• When shifting between the transfer
switch position and the transfer gear
position is unmatched, all 4WD indicators
will blink and the buzzer will sound.
• If it is difficult to shift between "4H" and
"4H LOCK" while the vehicle is moving,
try accelerating and decelerating your
vehicle several times after turning the
transfer switch. Be sure to wait until traffic
conditions allow you to accelerate and
decelerate safety before using this procedure.
From 4H to N
64J209
Stop the vehicle completely, place the
transmission in "N" (Neutral) and depress
the brake pedal and the clutch pedal fully
(if equipped), then push in and turn the
switch to the mark (1) at the left of the "N"
position, and hold the switch in this posi-
tion for 5 seconds until the "N" indicator
blinks, then turn the switch to the "N" position.
When you turn the transfer switch to the
"N" position, "N" indicator will come on with
the buzzer sound.
CAUTION
• Be sure to stop the vehicle completely
before operating the transfer
switch to shift between "N" and
"4H", or between "4H LOCK" and
"4L LOCK".
• Do not shift between "4H" and "4H
LOCK" unless the front wheels are
in the straight-ahead position and
we recommend that the vehicle
speed be less than 100 km/h (60
mph).
Do not operate the transfer switch
while tires are racing.
• Do not operate your vehicle in "4H
LOCK" or "4L LOCK" on dry, hard
surfaces.
(Continued)
CAUTION
(Continued)
• Do not operate the vehicle while a
4WD mode indicator is blinking
except when shifting between "4H"
and "4L LOCK".
If you operate the vehicle while a
4WD mode indicator is blinking, a
buzzer will sound and the transfer
will shift to "N" (Neutral) to prevent
transfer case damage.
In this case, use the following procedure.
1) Depress the clutch pedal fully (if
equipped) or shift the automatic
transmission gearshift lever to the
"N" position.
2) Turn the transfer switch to the
position previously selected.
3) Operate the transfer switch again.
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