New Holland UCM 1222 – UCM (Universal Control Module): Health Monitor Functions: UCM Sustained Over Temperature Limit

This is an internal health monitoring code indicating that the internal temperature of the control module has exceeded its maximum safe operating threshold for a prolonged period.

• L213
• L215
• L216
• L218
• L220
• L221
• L223
• L225
• L228
• L230
• C227
• C232
• C238

1. 1

   Check the physical location of the UCM for external heat sources, debris buildup, or lack of ventilation that could be baking the module

2. 2

   Inspect the UCM housing for signs of physical damage, burning, melting, or severe oxidation/corrosion

3. 3

   Inspect the wiring harness and connectors for shorts to ground or power (a short can cause excessive current draw and heat)

4. 4

   Verify system voltage to ensure the alternator is not overcharging the system, which can cause electronic components to overheat

5. 5

   If the wiring, voltage, and environment are normal, conclude that the fault is an internal hardware failure within the UCM's circuitry

1. 1

   Turn off the machine and disconnect the battery

   Disconnect the negative cable first to prevent electrostatic discharge or short circuits.

2. 2

   Locate the UCM

   Locate the UCM on the machine.

3. 3

   Disconnect the wiring harness

   Carefully disconnect the multi-pin wiring harness connectors from the UCM.

4. 4

   Remove the faulty UCM

   Remove the retaining hardware and extract the faulty UCM.

5. 5

   Install the replacement UCM

   Install the replacement UCM and secure it with the mounting hardware.

6. 6

   Reconnect the wiring harness

   Reconnect the wiring harness securely.

7. 7

   Reconnect the battery

   Reconnect the battery.

8. 8

   Program the new UCM

   The new or remanufactured UCM will be blank or have base software. It must be flashed/programmed with the correct machine-specific software using the New Holland Electronic Service Tool (EST) before the machine will operate.