P0046 on Toyota
Turbocharger/Supercharger Boost Control 'A' Circuit Range/Performance
P0046 on Toyota vehicles indicates turbocharger/supercharger boost control 'a' circuit range/performance. Au7o has documented this code across 1 Toyota model — most commonly on Tundra. 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.
Common Causes of P0046
- •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
P0046 on Toyota by Model
Toyota Tundra(1 issue)
- Turbocharger Electronic Wastegate Actuator Failure (V35A Twin-Turbo)2022-2025
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.
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View P0046 across all makes →Frequently Asked Questions
What does P0046 mean on 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 specifically, this code is documented across 1 model.
What causes P0046 on Toyota vehicles?▼
Common causes on Toyota: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0046 on a Toyota?▼
Repair costs vary widely depending on the root cause and specific Toyota model.
Which Toyota models have P0046 documented?▼
Au7o has documented P0046 on 1 Toyota model: Tundra.