Top Failure Modes:

1. Solenoid Sticking/Failure – Dirty fluid or wear causes erratic shifting (especially shift solenoids & TCC).

2. Valve Bore Wear – Excessive clearance leads to pressure leaks & delayed shifts (common in high-mileage units).

3. Check Ball/Spring Fatigue – Weak springs or stuck balls cause harsh engagements or loss of gear.

4. PCB/Electrical Issues – Corrosion or cracked circuits disrupt solenoid signals.

5. Gasket/Seal Degradation – Cracks or leaks cause low pressure & erratic operation.

Key Symptoms:

• Erratic/harsh shifts

• Transmission slipping

• Error codes (e.g., P0751, P2769)

Fix: Rebuild with precision-machined sleeves or replace valve body; flush fluid & cooler lines