New Holland EHR 4191 – EHR (Electro-Hydraulic Remote) control module: EHR 2 Offline Err

Electro-Hydraulic Remote (EHR) valve #2 has lost communication with the tractor's control network (CAN bus) or is completely offline, typically due to an internal module failure, a severed connection, or a loss of power/ground to that specific valve.

• New Holland T8.275
• New Holland T8.300
• New Holland T8.320
• New Holland T8.330
• New Holland T8.350
• New Holland T8.360
• New Holland T8.380
• New Holland T8.390
• New Holland T8.410
• New Holland T8.420
• New Holland T8.435
• New Holland T7.175
• New Holland T7.190
• New Holland T7.210
• New Holland T7.230
• New Holland T7.260
• New Holland T7.270
• New Holland T6.145
• New Holland T6.155
• New Holland T6.165
• New Holland T6.175

1. 1

   Inspect the wiring harness and the electrical connector at the EHR 2 valve for physical damage, corrosion, or loose pins.

2. 2

   Verify that the EHR 2 valve is receiving proper 12V power and ground.

3. 3

   Check the CAN bus communication lines at the valve connector for continuity.

4. 4

   Swap the electrical connector from EHR 2 with an adjacent, known-good valve (such as EHR 1 or EHR 3). If the fault code changes to the corresponding valve's offline code (e.g., EHR 4192 for EHR 3 offline), the EHR 2 valve itself has failed internally. If the code remains EHR 4191, the issue is in the wiring harness or the main controller.

5. 5

   Check the system for related armrest control codes (e.g., 4173 'EHR 2 lever not calibrated', 18042 'EHR 2 lever position voltage too low', or 18043 'EHR 2 lever position voltage too high') to rule out a failure at the cab controls rather than the valve.

1. 1

   Disconnect the battery

   Disconnect the battery to ensure the system is powered down before servicing the hydraulic electronics.

2. 2

   Repair or replace the affected section of the EHR wire harness

   If the diagnostic checks point to a wiring issue, repair or replace the affected section of the EHR wire harness.

3. 3

   Remove the defective EHR 2 valve assembly

   If the valve module is internally faulty, relieve hydraulic pressure and remove the defective EHR 2 valve assembly from the rear remote valve stack.

4. 4

   Install the replacement EHR valve

   Install the replacement EHR valve and torque the mounting bolts to OEM specifications.

5. 5

   Reconnect the electrical harness

   Reconnect the electrical harness to the new valve.

6. 6

   Reconnect the battery and power on the tractor

   Reconnect the battery and power on the tractor.

7. 7

   Calibrate the newly installed spool valve

   Access the tractor's diagnostic display or connect the electronic service tool. Navigate to the TCU (Tractor Control Unit) menu -> EHR -> Calibrate -> Remote Valves to calibrate the newly installed spool valve.