CVT Transmission Shudder or Jerking

Solution Steps:

1. Check CVT Fluid

• Verify CVT fluid level using the dipstick (if equipped) or inspection plug
• Check fluid color and condition
• CVT fluid should be red/pink and not smell burnt
• Low or contaminated fluid is a common cause

2. CVT Fluid Service

• Drain and replace CVT fluid (use only Toyota CVT Fluid FE or equivalent)
• Replace CVT fluid filter if equipped
• Proper fluid level is critical for CVT operation
• Service interval: Every 60,000-100,000 miles

3. Transmission Control Module (TCM) Reset

• Use Toyota Techstream or compatible scanner to reset TCM adaptations
• Clear transmission learned values
• Relearn shift patterns through driving cycle

4. Diagnostic Checks

• Scan for transmission fault codes (P0700 series)
• Check transmission temperature
• Test drive to reproduce symptoms
• Monitor transmission data with scan tool

5. Common Causes

• Low/Contaminated CVT Fluid: Most common cause
• TCM Software Issues: May require update
• CVT Pulley Wear: Mechanical wear in CVT unit
• Torque Converter Issues: Lock-up clutch problems
• Input/Output Speed Sensor: Faulty sensor readings

6. Repair Options

• Fluid Service: First step, often resolves issue
• TCM Update: Software update from dealer
• CVT Rebuild: Required for severe mechanical damage
• Transmission Replacement: Last resort for catastrophic failure

7. Prevention

• Regular CVT fluid changes (every 60,000 miles)
• Avoid aggressive driving and towing beyond capacity
• Allow transmission to warm up before hard acceleration
• Use only Toyota-approved CVT fluid