U0144moderate severityNetwork
Lost Communication with A/C Compressor Control Module
on 2014 Ram 2500 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.
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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