DTC P0033-12: Turbocharger / Supercharger Bypass Valve "A" Control Circuit Short to Battery [09/2022 - 09/2024]: Description
WARNING: This page is about a different car, the 2025 Toyota GR Corolla, 2024 Toyota GR Corolla, and 2023 Toyota GR Corolla. However, it is still accessible from the selected car via links, so may be relevant.
The air by-pass valve assembly is installed in the air outlet duct. It opens and closes in response to drive commands from the ECM. During normal boosting, the air by-pass valve assembly is closed, and when the throttle valve is closed while the boost pressure is applied, the air by-pass valve assembly opens and the excess pressure between the turbocharger and throttle valve is released to prevent the surge phenomenon*.
*: This phenomenon is when the intake air flow reverses. As a result, an abnormal noise is easily generated during deceleration.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Note |
|---|---|---|---|---|---|
| P0033-12 | Turbocharger / Supercharger Bypass Valve "A" Control Circuit Short to Battery | Short circuit in air by-pass valve assembly circuit and power supply circuit (1 trip detection logic). |
|
Does not come on | SAE Code: P0035 |