Owners of 2011-2012 Ram vehicles (including 1500, 3500, 3500 Cab Chassis, 2500 and 4500/5500 Cab Chassis) may display a “Service 4WD” light in the cabin compartment node (CCN). Upon further investigation the technician may find that DTC C2201 – FDCM/DTCM internal diagnostic trouble code is set in the DTCM. When the system detects this, it shuts down the 4WD capability for the remainder of the drive cycle.
This condition is not monitored when operating in 2WD mode. Updating the DTCM software will correct the condition.
The technician must use wiTECH software level 12.02 or higher to perform the procedure.
Using a scan tool (wiTECH) with the appropriate diagnostic procedures available in TechCONNECT, verify that no DTCs are set. If DTCs are present other than the one listed here, record them on the repair order and repair as needed before proceeding.
If yes, proceed to Step 7. If not, refer to the appropriate diagnostic procedure available in Dealer/CONNECT/TechCONNECT group 28 – DTC-Based Diagnostics/MODULE, Drivetrain Control (DTCM)/Diagnosis and Testing – C2201 – FDCM/DTCM Internal.
NOTE: Install a battery charger to ensure that battery voltage does not drop below 13.2 volts. Do not allow charging voltage to climb above 13.5 volts during the flash process.