U0144moderate severityNetwork
Lost Communication with A/C Compressor Control Module
on 1997 Dodge Ram 3500 6.7L I6 Cummins Diesel · 4WD
What this code means
Cannot communicate with the air conditioning compressor clutch control module.
Symptoms
- A/C not engaging
- A/C compressor not running
- Climate control warning
- No cold air from vents
Common causes
- A/C compressor module failure
- CAN bus wiring
- Module power loss
- Fuse blown
- Compressor clutch failure
Diagnostic steps
- Check A/C compressor fuse
- Test module power and ground
- Check CAN wiring
- Test compressor clutch directly
- Check refrigerant pressure
Repair notes
Check refrigerant charge first, then fuses. Low refrigerant prevents compressor engagement.
Other Network codes on this vehicle
U0001
High Speed CAN Communication Bus
U0002
High Speed CAN Communication Bus Performance
U0003
High Speed CAN Communication Bus (+) Open
U0004
High Speed CAN Communication Bus (+) Low
U0005
High Speed CAN Communication Bus (+) High
U0006
High Speed CAN Communication Bus (-) Open
U0007
High Speed CAN Communication Bus (-) Low
U0008
High Speed CAN Communication Bus (-) High
U0009
High Speed CAN Communication Bus Shorted Together
U0010
Medium Speed CAN Communication Bus