P0243 on Ford: How to Diagnose & Fix
Turbocharger/Supercharger Wastegate Solenoid "A" Malfunction
2 Ford models · 2 documented issues · 1 critical · $250-$5,000 repair
P0243 on Ford by model: symptoms, diagnosis and fix
The wastegate on the 3.5L EcoBoost turbochargers fails, either sticking (carbon/corrosion binding the valve and actuator arm) on early vacuum-operated designs or through electronic actuator/position-sensor faults on 2015-and-newer electric-actuator turbos. A stuck-closed wastegate causes overboost (P0234) and a metallic rattle, while a stuck-open wastegate or sensor/actuator faults cause underboost (P0299) and trip the powertrain into reduced-power limp mode. Because Ford does not sell the electronic wastegate actuator as a separate service part on later trucks, the accepted dealer repair is replacement of the entire affected turbocharger assembly, making it an expensive failure. Ford also issued TSB guidance (e.g., wastegate-arm rattle spring kits on 2017 3.5L) for related linkage slack.
Common Symptoms
- Significant loss of power / limp mode
- Wrench light and 'reduced engine power' warning
- Metallic rattle at startup or when lifting off the throttle
- Boost gauge showing over- or under-boost
- Check engine light with turbo wastegate performance codes
How to Fix
Diagnose the boost-control fault and rule out unrelated causes first (charge-pipe/boost leaks, cracked intercooler pipe, BOV, solenoid, vacuum leaks). On early vacuum-actuator turbos the wastegate actuator/diaphragm or linkage can sometimes be serviced or freed; on 2015+ electric-actuator turbos Ford's procedure replaces the complete turbocharger assembly since the actuator is not sold separately. Replace oil feed line screens if oil starvation contributed.
Sources for this issue (1)
The 2.0L EcoBoost uses an electronic wastegate actuator on the turbocharger. 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.
Common Symptoms
- Metallic rattle from the turbo at idle or light throttle
- Check engine light with underboost code
- Flat spot or lack of power on acceleration
- Whistle or hiss under boost
- Limp mode on hard acceleration
- Rattle worse on cold start
How to Fix
Inspect the wastegate actuator rod and the e-clip at the linkage first - a missing clip is cheap to fix and is a known cause of both the rattle and the codes. If the actuator is electrically failed or its commanded-vs-actual position is out of range on a scan tool data log, replace the wastegate actuator assembly (available separately from the turbo on these engines). Check the charge-air plumbing and the turbo bypass valve for leaks before condemning the turbo on an underboost code. Once the flap and bushings are worn enough to be sloppy, the turbocharger itself needs replacement.
Sources for this issue (4)
P0243 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0243 mean on a Ford?
P0243 stands for "Turbocharger/Supercharger Wastegate Solenoid "A" Malfunction." This code indicates a general fault with turbocharger/supercharger wastegate solenoid "A," which the engine control module uses to manage boost pressure. The computer has detected the solenoid or its circuit is not responding correctly (open, shorted, or out of expected operating range). Because it governs boost, a fault can lead to overboost or underboost, reduced power, or a limp mode. On Ford it is documented across 2 models: F-150, Edge.
What are the most common causes of P0243?
The most common causes of P0243 are: Failed or sticking wastegate solenoid, Open or shorted wiring in the solenoid circuit, Corroded or damaged electrical connector, Mechanical wastegate sticking or binding, Vacuum/boost hose leaks or blockage, Faulty ECM/PCM solenoid driver (rare). The specific cause varies by vehicle.
How much does it cost to fix P0243 on a Ford?
Published repair estimates on Ford range from $250 to $5,000 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P0243 on a different make?
View P0243 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.