Valtra BH Series 140–210 SA 28 SPN 520224 FMI 02: Internal Roll Inertial Sensor Fault Fix

Learn how to troubleshoot Valtra BH Series 140–210 guidance error SA 28 SPN 520224 FMI 02. Step-by-step checks: stop and settle, repower guidance controller, and when replacement is required.

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What the code means

• SA 28: The reporting controller (guidance controller)
• SPN 520224: Internal roll inertial sensor signal
• FMI 02: Erratic, intermittent, or incorrect signal

Why it happens

Common triggers include:

• The machine wasn’t fully settled (still rocking, on a slope, or soft ground)
• Temporary electrical/power irregularity (startup voltage dip, loose power connection)
• Internal hardware failure inside the guidance controller

Safety first

Before troubleshooting:

• Park on flat, stable ground
• Set parking brake and follow site safety procedures
• Keep the machine stationary during the “settling” step

Troubleshooting (recommended order)

Step 1 — Stop the vehicle and let it settle

 

Action

1. Bring the vehicle to a complete stop
2. Park on flat ground
3. Wait 5 minutes (no movement)

Expected result

• The fault clears and does not immediately return

What it means

• YES (clears): Likely a false/temporary diagnostic caused by motion or unstable conditions
  → Go to Step 3
• NO (still active): Continue troubleshooting
  → Go to Step 2

Step 2 — Repower the guidance controller

Action

1. Turn off / disconnect power to the guidance controller using the proper switch
2. Wait 30 seconds
3. Restore power and restart the guidance system

Expected result

• The fault clears after power cycle

What it means

• YES (clears): Likely temporary glitch or power-related event
  → Go to Step 3
• NO (still active): Strong indication of guidance controller hardware failure
  → Replace the controller according to the customer’s warranty/replacement plan (Stop here)

Step 3 — Report and monitor (false diagnostic workflow)

If the code cleared in Step 1 or Step 2:

1. Report the false diagnostic to AGCO Technical Support
2. The customer may resume operation
3. Ask the operator to monitor the system—if the error reappears, repeat Steps 1–2 and document:
   • Date/time and operating conditions (slope, speed, terrain)
   • Whether it happens on startup or during turns/bumps
   • Any recent wiring/power work or low-battery events

When replacement is the most likely fix

Replace the guidance controller if:

• The fault does not clear after settling + repower
• The fault returns frequently under normal, stable conditions
• You see additional guidance controller errors pointing to internal sensors

Quick summary

• FMI 02 = signal is erratic/intermittent/incorrect
• Try settling on flat ground → then repower controller
• If it won’t clear, the internal sensor is not serviceable → controller replacement is typically required