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'.
Reviewed by SubaruReview Editorial Team · Last reviewed 2026-05-15 · Editorial standards
This is one of several documented WRX / STI problems we track, and it fits inside the broader Engine Guides guide. If you're weighing repair against replacement, cross-check the Subaru repair-cost database and any open NHTSA recalls on your VIN before booking a shop.
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.
Internal plastic gear failure or electrical motor burnout within the TGV actuator, often caused by carbon buildup on the butterfly valves creating physical resistance.
Internal plastic gear failure or electrical motor burnout within the TGV actuator, often caused by carbon buildup on the butterfly valves creating physical resistance.
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.
Difficulty 3/5. Replacement of the failed TGV motor/actuator assembly with OEM part 14120AA054 or 14120AA060.
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
Owners typically pay $450–$950 at an independent Subaru shop, parts and labor included. Our Subaru EyeSight Recalibration Cost guide breaks the job down by parts, labor hours, and where the money actually goes.
Cross-check NHTSA campaign 23V016000, which covers 2022 WRX – Owner's Manual Correction on 2022 WRX. Recall work is free at any Subaru dealer — always run your VIN before paying for the fix.
We rate it 3/5 on our DIY scale. Confident wrenchers can tackle it in a weekend using the permanent-fix steps above. Cross-reference the reliability & common problems hub for related jobs worth bundling while you're in there.
Dig into the Problems Database to plan your next maintenance sprint, or browse every model hub for buyer's guides, generation breakdowns, and known-issue lists.