New Holland 14910 – Main Vehicle Controller: Climate Control System Controller Missing

The main vehicle control module has lost communication with the climate control system's electronic controller on the CAN bus network. The system logs this fault when it can no longer detect the presence of the climate control module, which may result in the inability to operate or monitor the climate control functions.

• T4
• T5
• T6
• T7
• T8
• T6000 Series
• TG Series
• TM Series
• T8040
• T5000 Series
• TL Series
• TLA Series
• TS100A

1. 1

   Check battery voltage to ensure it is stable and above 12.1V (low voltage can trigger ghost communication codes)

2. 2

   Inspect all related fuses, particularly main fuses near the batteries, for blown elements that could cut power to the controller

3. 3

   Verify main chassis and cab ground straps are clean, tight, and free of corrosion

4. 4

   Perform a CAN bus termination resistor check with power off (measure resistance between CAN_H and CAN_L; should be approximately 60 ohms)

5. 5

   Perform CAN bus voltage checks with power on and engine off (CAN High should be 2.5-3.0V, CAN Low should be 2.0-2.5V)

1. 1

   Isolate the fault

   If the initial diagnostic checks do not reveal an obvious issue like a blown fuse or bad ground, the next step is to isolate the climate control module.

2. 2

   Locate the climate control module

   Consult parts diagrams for your specific model. On T6/T7 tractors, it is often the control panel on the console; on models like the T8040, it may be under the driver's seat.

3. 3

   Inspect connectors and wiring

   Disconnect the electrical connector at the climate control module. Inspect pins and sockets for corrosion, moisture, or damage. Check the wiring harness for chafing, pinching, or cuts, particularly near the firewall or chassis.

4. 4

   Verify power and ground

   With the key on, use a multimeter to confirm the controller is receiving battery power and has a solid ground connection at its connector.

5. 5

   Isolate the controller from the CAN bus

   If power and ground are good, disconnect the climate control module. If other unrelated CAN bus errors disappear, the module is likely disrupting the network and is faulty.

6. 6

   Replace the climate control module

   If confirmed faulty, replace the module with a new unit and clear all fault codes from the system.