Subaru WRX TGV Motor Failure & Diagnostic Trouble Codes
The 2008-2014 Subaru WRX often experiences TGV (Tumble Generator Valve) motor failure, triggering a Check Engine Light and forcing the vehicle into a restricted performance 'Limp Mode'.
Last updated: 2026-05-15
What goes wrong
The Tumble Generator Valves (TGVs) are butterflies in the intake runners designed to improve cold-start emissions. When the motor or sensor fails, the ECU cannot verify the valve position. To protect the engine from a lean condition, the car limits boost pressure and RPMs, resulting in a sluggish driving experience.
Symptoms to watch for
- Check Engine Light (Codes P2004, P2005, P2006, P2007, P2008, P2011, P2016, P2017, P2021, P2022)
- Flashing Cruise Control light
- Significant loss of power (Limp Mode)
- Rough cold starts and poor idling
- Decreased fuel economy
Root cause
Internal plastic gear failure or electrical motor burnout within the TGV actuator, often caused by carbon buildup on the butterfly valves creating physical resistance.
Buy time with these
- • Use an OBD-II scanner to clear codes (temporary)
- • Gently tap the TGV motor housing with a screwdriver handle to free a Stuck butterfly valve
- • Ensure the wiring harness connector is free of corrosion or oil wicking
Permanent fix
- Replacement of the failed TGV motor/actuator assembly with OEM part 14120AA054 or 14120AA060.
- Aftermarket TGV deletes (requires ECU tuning) for track-use applications.
Related recalls / TSBs
FAQ
What causes subaru wrx tgv motor failure & diagnostic trouble codes?
Internal plastic gear failure or electrical motor burnout within the TGV actuator, often caused by carbon buildup on the butterfly valves creating physical resistance.
How much does it cost to fix?
National average $450–$950. Includes OEM motor assembly ($250-$350) and 2-4 hours of labor. Prices vary if the entire TGV housing requires replacement.
Is this a DIY repair?
Difficulty 3/5. Replacement of the failed TGV motor/actuator assembly with OEM part 14120AA054 or 14120AA060.
What are the symptoms?
Check Engine Light (Codes P2004, P2005, P2006, P2007, P2008, P2011, P2016, P2017, P2021, P2022); Flashing Cruise Control light; Significant loss of power (Limp Mode); Rough cold starts and poor idling; Decreased fuel economy