Owners of 2011 Charger or Chrysler 300 vehicles may see a “Service 4WD” light in the cabin compartment node. The technician may find DTC C107B (tire revolutions range performance) set in the DTCM.
This condition may occur when driving on a slippery road and the AWD system is monitoring for slipping wheels. Under these conditions the AWD system may incorrectly determine that one wheel is spinning too much. When the AWD system detects this, it shuts down the AWD capability for the remainder of the drive cycle. The system is overly sensitive to wheel slip and may set this DTC when no issue is present.
The system was recalibrated to allow more wheel slip before setting this DTC. This condition is not monitored when operating in 2WD mode. Updating the DTCM software will correct the condition.
Using a scan tool (wiTECH) with the appropriate diagnostic procedures available in TechCONNECT, verify that no other DTCs are set. If other DTCs are present, record and repair as necessary before proceeding.
Install a battery charger to prevent battery voltage from dropping below 13.2 volts or above 13.5 volts during the flash process.
Reprogram the DTCM with the latest software. After DTCM reprogramming, clear any DTCs that may have set in other modules as a result of reprogramming. Type the necessary information on an authorized modifications label and attach it near the VECI label.