The PCM will turn off the MIL when the diagnostic runs and passes in three consecutive drive cycles, and will turn off the “Service DEF System See Dealer” EVIC message only when the diagnostic runs and passes, or the PCM is reflashed. The PCM will have the Electronic Vehicle Information Center (EVIC) display “Service DEF System See Dealer” message when this diagnostic runs and fails in one trip, and will illuminate the MIL when the diagnostic runs and fails in two consecutive drive cycles. This diagnostic will fail if the datalink information between the DEF Quality Sensor and the PCM has been lost. Customer support is top notch and was always there to help me when I had questions. The DEF Quality Sensor shares information with the Powertrain Control Module (PCM) over the J1939 Data Link. RAM DTC U02A2 Make: RAM Code: U02A2 Definition: Lost Communication With Reductant Quality Module Description: The Diesel Exhaust Fluid (DEF) Quality Sensor is mounted to the DEF tank and is used to detect the concentration of the DEF.
NOTE: Install a battery charger to insure that battery voltage does not drop below 13.2 volts. When youre out, speed gets limited to 4mph. If you ignore the warning, around 100 miles, speed gets limited to 55mph. A few miles down the road I got a DEF Range 900 miles warning.
The purpose of the SCR system is to reduce levels of NOx (oxides of nitrogen.
SCR is the leading technology being used to meet 2010 emission regulations. Using a scan tool (wiTECH) with the appropriate diagnostic procedures available in TechCONNECT, verify no DTCs are set. SCR is a technology that uses a urea based diesel exhaust fluid (DEF) and a catalytic converter to significantly reduce oxides of nitrogen (NOx) emissions.
Updating the DTCM software will correct the condition. This condition is not monitored when operating in 2WD mode. When the system detects this, it shuts down the 4WD capability for the remainder of the drive cycle.
Upon further investigation, the technician may find that C2201 – FDCM/DTCM internal diagnostic trouble code is set in the DTCM. Some owners may get a “Service 4WD” light in the Cabin Compartment Node (CCN). This TSB applies to 2011-20 pickup and RAM regular Cab Chassis (Mexico) and 20 pickup, 3500 Cab Chassis, 2500 pickup and 4500/5500 Cab Chassis vehicles.