P3026high severityPowertrain
CVT Torque Converter Lockup Clutch Slip
on 2003 Mini Cooper 1.6L I4 · FWD
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
- Monitor TCC slip at steady cruise
- Check CVT fluid condition and level
- Test lockup solenoid pressure
- Measure transmission temperature
- 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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Other Powertrain codes on this vehicle
29CC
Misfire Cylinder 1
29CD
Misfire Cylinder 2
29CE
Misfire Cylinder 3
29CF
Misfire Cylinder 4
29D0
Misfire Cylinder 5
29D1
Misfire Cylinder 6
29D2
Misfire Cylinder 7
29E0
Lambda Additive/Idle Adaptation Limit, Bank 1
29E1
Lambda Additive/Idle Adaptation Limit, Bank 2
29E2
Lambda Multiplicative Part-Load Adaptation Limit, Bank 1