P3024critical severityPowertrain
CVT Ratio Control System Stuck
on 2009 Audi R8 5.2L V10 (Gen 1, 525hp) · AWD
What this code means
The CVT ratio control system is unable to change the transmission ratio. The pulleys may be mechanically seized or the stepper motor has failed.
Symptoms
- Check Engine Light
- Engine revs stay constant regardless of speed
- No ratio change during acceleration
- Sudden RPM changes
- Vehicle feels stuck in one gear
- Harsh engagement from stop
Common causes
- Stepper motor failure
- Pulley guide rail damage
- Hydraulic valve body stuck
- Belt/chain jammed
- Foreign object in pulley mechanism
Diagnostic steps
- Monitor CVT ratio PID during driving
- Command ratio change with scan tool
- Check stepper motor operation
- Inspect hydraulic valve body operation
- Check for metallic debris in fluid
Repair notes
CVT likely requires removal and disassembly. Stepper motor or valve body replacement. Severe cases require transmission replacement.
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