This bulletin applies to 2011 Dodge Chargers equipped with a 5.7L engine. Some customers may see a “Service 4WD” light in the cabin compartment node. Upon further investigation, the technician may find that C1078 (tire revolutions range performance) 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 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 the 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 this condition.
Using a scan tool (wiTECH) with the appropriate diagnostic procedures available in TechCONNECT, verify that no other DTCs are present. If other DTCs are found, record and repair before proceeding.
Install a battery charger to ensure that battery voltage does not drop below 13.2 volts or above 13.5 volts during the flash process.
1. Reprogram the DTCM with the latest software.
2. Clear any DTCs that may have set as a result of reprogramming.
3. Type the necessary information on an authorized modification label and attach it near the VECI label.
