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2010 BMW M3 E90
4.0L V8 S65•RWD•DCT•gas•S65B40
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Repairs0Labor493Torque3437Fluid8DTC1459Battery1Maintenance0Recalls0
P3026high severityPowertrain

CVT Torque Converter Lockup Clutch Slip

on 2010 BMW M3 E90 4.0L V8 S65 · RWD

What this code means

The torque converter lockup clutch in the CVT is slipping beyond acceptable limits during cruise conditions.

Symptoms

  • Check Engine Light
  • RPM fluctuation at highway speed
  • Reduced fuel economy
  • Vibration at cruise
  • Transmission temperature elevated

Common causes

  • Lockup clutch friction material worn
  • CVT fluid degradation
  • Lockup control solenoid weak
  • Torque converter piston seal leak
  • Excessive heat damage to clutch

Diagnostic steps

  1. Monitor TCC slip at steady cruise
  2. Check CVT fluid condition and level
  3. Test lockup solenoid pressure
  4. Measure transmission temperature
  5. Compare input and output shaft speeds during lockup

Repair notes

Replace torque converter. Service CVT fluid. Use only manufacturer-specified CVT fluid.

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