P0243 on Toyota: How to Diagnose & Fix
Turbocharger/Supercharger Wastegate Solenoid "A" Malfunction
1 Toyota model · 1 documented issue
P0243 on Toyota by model: symptoms, diagnosis and fix
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.
Common Symptoms
- Check engine light / MIL on
- DTC P024313 stored
- No noticeable drivability change in many cases
- Possible reduced boost or power in some cases
How to Fix
Toyota published service bulletin T-SB-0091-23 (November 14, 2023) revising the ECM logic to reduce recurrence. The remedy is an ECM flash reprogram to the latest calibration (8A2223009400); this is a bulletin, not a recall, and Toyota covers it under the Federal Emission Warranty (96 months/80,000 miles) at no cost. If the code returns after the flash, the wastegate/vacuum regulating valve solenoid and its harness connector should be tested before any turbocharger assembly is condemned.
Sources for this issue (3)
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 Toyota?
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 Toyota it is documented across 1 model: Crown.
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 Toyota?
Repair costs vary widely with the root cause and Toyota model; each issue on this page carries its own estimate where one is published.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.