CVT Torque Converter Lockup Clutch Slip
2001-2005 BMW 325i E46 2.5L I6 🇩🇪
Description
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.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P3026 on Other Vehicles
Common Questions
What does code P3026 mean on a 2001-2005 BMW 325i E46?
P3026 stands for "CVT Torque Converter Lockup Clutch Slip". The torque converter lockup clutch in the CVT is slipping beyond acceptable limits during cruise conditions.
What are the symptoms of P3026 on a BMW 325i E46?
Common symptoms of P3026 include: Check Engine Light, RPM fluctuation at highway speed, Reduced fuel economy, Vibration at cruise, Transmission temperature elevated.
What causes P3026 on a 2001-2005 BMW 325i E46?
Common causes of P3026 include: Lockup clutch friction material worn, CVT fluid degradation, Lockup control solenoid weak, Torque converter piston seal leak, Excessive heat damage to clutch.