New Holland 4156 – EHR: Rear Remote No.5 - No EHR Control Messages

The main tractor control unit has lost communication with the electronic control unit (ECU) integrated into the fifth electro-hydraulic remote (EHR) valve. Each remote valve functions as an individual node on the CAN bus network, and this fault code is triggered when the main controller can no longer send or receive messages from the specific ECU of the #5 remote valve.

• T8.275
• T8.300
• T8.330
• T8.360
• T8.385
• T8.390
• T8030

1. 1

   Inspect the wiring harness leading to the #5 remote valve for chafing, cuts, or corrosion, especially where it rubs against the frame

2. 2

   Verify that all fuses related to the EHR and hydraulic systems are intact, as a blown fuse can interrupt module power

3. 3

   Disconnect and inspect the electrical connector at the #5 remote valve for corrosion, moisture ingress, or damaged pins. Clean the connector with a suitable electrical contact cleaner and ensure a secure connection when reassembled

4. 4

   Check for any other active fault codes that might indicate a wider CAN bus network problem rather than an isolated #5 remote issue

1. 1

   Check CAN bus resistance

   With the ignition off and battery disconnected, measure resistance between the CAN high and CAN low wires at the #5 remote valve connector. A healthy bus should read approximately 60 ohms. A reading of 120 ohms indicates a missing terminating resistor or wire break; infinite or near-zero resistance indicates an open or short circuit.

2. 2

   Check for shorts to ground or power

   Measure resistance from each CAN wire to chassis ground and to the power supply wire in the connector. Resistance should be in the mega-ohm range. A low reading indicates a short circuit.

3. 3

   Test wiring harness continuity

   Perform a continuity test on each wire between the #5 remote valve connector and the main EHR controller to identify any breaks in the harness.

4. 4

   Perform component substitution test

   If wiring is intact, swap the #5 remote valve with a known good valve from another position (e.g., #4). If the fault code follows the valve to the new position, the valve itself is faulty. If the fault remains at the #5 position, the issue is in the wiring or main controller.

5. 5

   Replace faulty component

   Based on the substitution test, replace the faulty component. If the remote valve is the cause, replace the entire valve assembly (which includes the integrated ECU).