What is SPN 791 FMI 7 & How to Solve It?

What is SPN 791 FMI 7:

SPN 791 relates to the transmission clutch circuit, and FMI 7 signals a mechanical issue or degraded clutch function.

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Why This Happens

• Internal clutch wear or slippage.
• Clutch solenoid not operating correctly.
• Hydraulic pressure drops within the clutch system.
• Misalignment or contamination inside the clutch assembly.

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How to Fix It

1. Inspect clutch engagement timing and performance.
2. Test solenoid response and electrical circuit.
3. Check hydraulic pressure and fluid levels.
4. Replace or repair the clutch if wear or slippage is confirmed.
5. Clear the fault and verify engagement behavior.

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How to Avoid It Before It Happens

1. Replace clutch fluid at recommended intervals.
2. Monitor clutch wear indicators via diagnostics.
3. Calibrate clutch operation after major drivetrain repairs.