P0243: How to Diagnose & Fix — Turbocharger/Supercharger Wastegate Solenoid "A" Malfunction

The wastegate actuator and boost solenoid can fail, causing boost control issues, over-boost conditions, or under-boost faults.

The B58 engine's electronic wastegate actuator can develop play over time, producing a characteristic rattling or buzzing noise at idle and during deceleration. The wastegate flapper valve develops clearance within its housing, causing it to vibrate at certain RPMs. While often described as just an annoyance, a severely worn wastegate can lead to boost control issues, over-boost or under-boost conditions, and eventually check engine lights for boost deviation faults.

The 2019 and later 2.0L EcoBoost uses an electronic wastegate actuator on the turbocharger (2015-2018 Edges use a vacuum-operated wastegate). Two related failures show up repeatedly: the actuator rod's retaining e-clip goes missing or the linkage works loose, producing a metallic rattle from the turbo area at idle and light throttle; and the electronic actuator itself fails or sticks, so the PCM cannot hold commanded boost and sets an underboost or actuator-performance code with a noticeable flat spot under acceleration. On 2019-2021 Edges the wastegate actuator fault often surfaces as P1464, a code whose description misleads shops toward the A/C system. Left alone, a flapping wastegate flap wears its bushings and eventually requires the whole turbo.

Some 2023 Toyota Crown vehicles built with the Hybrid MAX 2.4-liter turbocharged T24A-FTS engine (Platinum grade) illuminate the MIL and store DTC P024313, Turbocharger/Supercharger Wastegate Solenoid 'A' Circuit Open. Toyota modified the Engine Control Module logic to reduce the possibility of this condition, so the bulletin's repair is an ECM reflash rather than hardware replacement. The naturally aspirated 2.5-liter A25A-FXS hybrid Crown (XLE/Limited) has no turbocharger and is not subject to this code.

N63 4.4L twin-turbo V8 engines in E71/F16 X6 xDrive50i (2008-2018) suffer from wastegate rattle and eventual turbocharger failure. The wastegate flapper jiggles within its mounting points against the turbo housing due to worn bushings, most noticeable at idle or when letting off throttle. This progresses to wastegate actuator failure, loss of boost, and eventually complete turbo failure requiring replacement of both turbos ($4,000-8,000). Garrett MGT2256S turbochargers are used in this application. Flapper repair kits are available for $50-100 per turbo as a more affordable intermediate fix. MAMBA adjustable actuator kits ($150-300) offer a more permanent solution. This compounds the N63 timing chain issue - 2008-2014 models have BOTH catastrophic timing chain AND wastegate/turbo failures.