Case IH EHR4156 – Armrest / TCU / XCM: Rear Remote No.5 - No EHR Control Messages (Component 5)

The fault code EHR4156 indicates a total loss of communication with the electronic controller for the number five rear hydraulic remote valve. The main control unit is not receiving the expected Controller Area Network (CAN) bus messages from the dedicated electronic module on that specific remote valve. This prevents the tractor from monitoring or controlling the functions of rear remote number five, pointing to an electrical issue in the communication wiring, the valve's electronic controller, or the main tractor controller.

• Magnum 235
• Magnum 305
• Magnum 315
• Magnum 340
• Steiger 350
• Steiger 400
• Steiger 450
• Steiger 500
• Steiger 550
• Steiger 600
• Maxxum

1. 1

   Visually inspect the wiring harness leading to the number five rear remote valve for chafing, pinching, or corrosion. On articulated tractors, pay close attention to the main harness at the articulation point.

2. 2

   Disconnect and inspect the electrical connector at the number five remote valve controller for corrosion, moisture intrusion, or damage.

3. 3

   Perform a swap test by exchanging the electronic controller from remote #5 with a known working one (e.g., remote #4) to see if the fault follows the module.

4. 4

   Check CAN bus termination resistance across CAN_H and CAN_L pins at the remote #5 connector with the key off (should be approx. 60 Ohms).

5. 5

   Measure CAN bus voltages with the key on (CAN_H should be 2.5-3.0 V, CAN_L should be 2.0-2.5 V).

6. 6

   Check continuity of CAN_H and CAN_L wires from the main controller to the remote valve connector with the key off and modules disconnected.

7. 7

   Check with a dealer for any available software updates or service bulletins related to EHR faults.

1. 1

   Isolate the fault

   Based on the diagnostic checks, determine if the issue lies with the remote valve's electronic controller, the wiring harness, or the main control unit.

2. 2

   Repair wiring harness

   If a wiring issue (open, short, or corrosion) is found, repair the affected section of the harness and ensure all repairs are sealed against moisture.

3. 3

   Replace electronic control module or valve

   If the electronic control module (pilot head/actuator) is faulty, replace it. If it is not sold separately, replace the entire remote valve slice.

4. 4

   Clear fault codes

   Use the tractor's diagnostic menu or a service tool to clear all active and stored fault codes after the repair.

5. 5

   Calibrate and verify

   Perform any required calibration procedures for the new remote valve. Operate the tractor and test all functions of remote #5 to verify the repair.