CVT Ratio Control System Stuck
2003-2009 Toyota 4Runner 4.7L V8
Description
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.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
P3024 on Other Vehicles
Toyota 4Runner
2003-2009 4.0L V6
Toyota 4Runner
2010-2024 4.0L V6
Toyota 86
2017-2020 2.0L H4
Toyota Alphard
2023-2025 2.4L I4 Turbo T24A-FTS
Toyota Alphard
2023-2025 2.5L I4 Hybrid A25A-FXS
Toyota Altezza
1998-2005 2.0L I4 3S-GE BEAMS
Toyota Altezza
1998-2005 2.0L I6 1G-FE
Toyota Aqua
2011-2021 1.5L I4 Hybrid 1NZ-FXE
Common Questions
What does code P3024 mean on a 2003-2009 Toyota 4Runner?
P3024 stands for "CVT Ratio Control System Stuck". The CVT ratio control system is unable to change the transmission ratio. The pulleys may be mechanically seized or the stepper motor has failed.
What are the symptoms of P3024 on a Toyota 4Runner?
Common symptoms of P3024 include: 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.
What causes P3024 on a 2003-2009 Toyota 4Runner?
Common causes of P3024 include: Stepper motor failure, Pulley guide rail damage, Hydraulic valve body stuck, Belt/chain jammed, Foreign object in pulley mechanism.