P0046 on Toyota: How to Diagnose & Fix
Turbocharger/Supercharger Boost Control 'A' Circuit Range/Performance
1 Toyota model · 1 documented issue · 1 critical
P0046 on Toyota by model: symptoms, diagnosis and fix
Third-generation Tundras with the V35A-FTS twin-turbo V6 (both gas and i-FORCE MAX hybrid) commonly throw boost/wastegate fault codes due to failure of the electronic wastegate actuators integrated into the turbo housings. Early 2022 builds were affected by a bad batch of actuators with an internal electrical fault; thermal cycling also fatigues the actuator over time. When the actuator binds or its circuit fails, the ECU cuts boost and drops the engine into reduced-power/limp mode. Because the actuator is part of the turbo housing, Toyota's initial procedure required replacing the entire turbocharger — an extremely labor-intensive job that can require pulling the cab. This is a distinct, separate failure from the metal-debris main-bearing engine-replacement recall.
Common Symptoms
- Check engine light with boost/wastegate codes
- Sudden loss of power / limp mode
- Reduced acceleration or no boost
- Rattling or buzzing from turbo area
- Inconsistent throttle response
How to Fix
Scan for boost-control/wastegate codes and confirm actuator function. Under powertrain warranty Toyota replaces the affected turbocharger/wastegate assembly. For the early-2022 'bad batch,' replacement of the updated actuator/turbo resolves the recurring CEL. Out of warranty this is a major repair; some independent shops can replace just the actuator on the updated procedure where supported.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Toyota 17201-F4011 genuine left turbocharger subassembly
replace a repair-manual-confirmed defective left turbocharger/wastegate subassembly Fitment/availability: Left/driver-side V35A turbo branch; catalog supersedes 17201-70070 and 17201-F4010, and VIN, gas-versus-hybrid configuration, produ…
- Toyota 17208-F4011 genuine right turbocharger subassembly
replace a repair-manual-confirmed defective right turbocharger/wastegate subassembly Fitment/availability: Right/passenger-side V35A turbo branch; catalog supersedes 17208-70070 and 17208-F4010, and VIN, gas-versus-hybrid configuration, …
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Sources for this issue (3)
P0046 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 P0046 mean on a Toyota?
P0046 stands for "Turbocharger/Supercharger Boost Control 'A' Circuit Range/Performance." P0046 is a generic powertrain code indicating a range/performance problem in the turbocharger or supercharger boost-control 'A' circuit — the computer's commanded boost-control signal does not match the actual measured response. This means the boost-control solenoid or actuator is responding too slowly, sticking, or producing implausible feedback rather than a clean electrical short or open. The driver may notice reduced power, surging boost, or a limp mode along with a check engine light. It should be diagnosed to restore proper boost regulation and protect the engine. On Toyota it is documented across 1 model: Tundra.
What are the most common causes of P0046?
The most common causes of P0046 are: Sticking or worn boost-control solenoid/actuator, Carbon-fouled or binding variable-geometry turbo vanes, Vacuum leak or restricted vacuum line to the actuator, Wiring/connector resistance affecting the control signal, Boost pressure sensor inaccuracy, Worn turbocharger affecting boost response. The specific cause varies by vehicle.
How much does it cost to fix P0046 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.