2007 ram 1500 4wd 5.7,37k.mi. My serv 4wd light comes on intermittingly when it comes on ,selector switch does nothing,sometimes I can cut engine off start driving light stays out and selector swicth works normal, seems like it is happening more frequently now.It's weird drove about 60mi. yesterday no problem, went to go today and it came on right when I started it . Any ideas?
Thanks

 

DJ,

I found one TSB that may be related to your issue. TSB below.

NUMBER: 03-001-07
GROUP: Differential &
Driveline
DATE: July 21, 2007

SUBJECT:
4WD System May Not Engage Or Disengage As Desired With "SERV 4WD" Message
OVERVIEW:
This bulletin involves replacement of the Front Axle Disconnect (FAD) actuator and
selectively erasing and reprogramming the Totally Integrated Power Module (TIPM) with
new software.
MODELS:
2006 - 2007 (DR) Ram Truck (1500)
NOTE: This bulletin applies to light duty 4x4 Ram Trucks built on or before June 01,
2007 (MDH 0601XX).
SYMPTOM/CONDITION:
The vehicle operator may experience one or more of the following conditions:
A). The four wheel drive (4WD) system may not engage or disengage as designed, when
the drive mode is changed between 2WD and either 4WD Auto or 4WD Lock (or back to
2WD from 4WD).
B). An illumination of the “SERV 4WD” message in the Instrument Panel (IP)
C). When four wheel drive (4WD) mode is selected, the amber “4WD” lamp flashes
continuously in the IP signaling that the 4WD system has not been engaged.
D). Diagnostic Trouble Code (DTC) C1464 - Front Axle Disconnect (FAD) High Side
Short To Ground - is present in the TIPM.
This condition may be due to TIPM software and its affect on the FAD actuator
mechanism.

 

Mines sort of the same problem I posted this weeks ago but I got pretty much no help... Good luck

https://dodgeforum.com/forum/3rd-gen...t-came-on.html