P2377 means the engine control module has detected a voltage signal from the turbocharger/supercharger inlet pressure sensor B that is higher than the expected range. This sensor measures pressure at the compressor inlet; a high circuit reading usually indicates a fault with the sensor, its wiring, or a rare ECM input issue.
The sensor itself may have an internal short or failure causing its output voltage to read excessively high.
Damage to the signal wire (e.g., chafing, melted insulation) can cause it to contact a 12 V source, pulling the signal high.
Poor contact can create a false high voltage reading due to increased resistance or intermittent power coupling.
A rare internal fault in the ECM’s sensor input circuit can register a high voltage even with a good sensor and wiring.
No. The PCM/ECM is seldom the cause; most cases are due to the sensor, its wiring, or connector. Replacing the module should only be considered after all sensor and wiring checks have been completed and the code persists.
Driving is possible but not recommended for extended periods. The ECM may limit boost or power, and an incorrect pressure reading could lead to overboost or engine damage if the condition worsens.
Cleaning the sensor exterior will not resolve an internal electrical fault or wiring issue. If the sensor is contaminated, cleaning may help, but a high circuit voltage usually points to an electrical fault rather than dirt.
Yes. After the repair, clear the code with a scan tool and verify that it does not return during a test drive.