This TSB applies to 2011 Dodge Charger and Chrysler 300 vehicles. Some customers may see a “Service 4WD” light in the Cabin Compartment Node (CCN). The technician may find that C1078 (tire revolutions range performance) DTC is 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 slipping 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 re-calibrated to allow more wheel slip before setting this DTC. This condition is not monitored when operating in 2WD mode. Updating the DTCM software with software release level 12.01 or higher will correct the condition.
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 and repair as needed before proceeding.
Install a battery charge to ensure that battery voltage does not drop below 13.2 volts. Do not allow charging voltage to exceed 13.5 volts during the flash process.
Reprogram the DTCM with the latest software. Help using the wiTECH diagnostic application for flashing an ECU is available by selecting “help” then “help contents” at the top of the wiTECH diagnostic application window.After DTCM reprogramming, clear any DTCs that may have set in other modules due to reprogramming.Type the necessary information on an authorized modifications label and attach it near the VECI label.