C0500high severityChassis
Transfer Case Control Module Malfunction
on 2002 Dodge Ram 2500 5.9L I6 Cummins Diesel · 4WD
What this code means
Internal fault in the transfer case control module that manages 4WD/AWD operation.
Symptoms
- 4WD warning light
- Service 4WD message
- Cannot shift between 2WD and 4WD
- Transfer case stuck in current mode
Common causes
- Module internal failure
- Module power supply fault
- Software error
- CAN communication loss
- Overheated module
Diagnostic steps
- Check module power supply and ground
- Scan for CAN communication codes
- Check module connector for corrosion
- Attempt module reset
- Check for software updates
Repair notes
Replace transfer case control module. Reprogram and calibrate after installation.
Other Chassis codes on this vehicle
C0021
LF Wheel Speed Sensor Range/Performance
C0022
RF Wheel Speed Sensor Range/Performance
C0023
LR Wheel Speed Sensor Range/Performance
C0024
RR Wheel Speed Sensor Range/Performance
C0025
LF Wheel Speed Sensor Circuit Intermittent
C0026
RF Wheel Speed Sensor Circuit Intermittent
C0027
LR Wheel Speed Sensor Circuit Intermittent
C0028
RR Wheel Speed Sensor Circuit Intermittent
C0035
Left Front Wheel Speed Sensor Circuit
C0036
Left Front Wheel Speed Signal Erratic