The engine control module has detected an unstable or erratic voltage signal from the turbocharger or supercharger inlet pressure sensor (Sensor B). This indicates that the sensor's output is fluctuating outside of normal operating parameters or intermittently dropping out.
Internal component failure or worn electrical contacts within the sensor causing an unstable signal.
Frayed wires, corroded terminals, or loose connectors causing intermittent connection to the ECM.
Oil, carbon buildup, or debris obstructing the sensor element, leading to erratic pressure readings.
Leaks in the lines leading to the sensor that cause pressure fluctuations.
A fault in the control module's processing circuit for the pressure sensor input.
Yes, oil or carbon deposits on the sensing element can cause the sensor to report erratic pressure values.
No. While possible, it is very rare. Most P2378 issues are resolved by replacing the sensor or repairing the wiring harness.
The vehicle will typically run, but the ECM may limit boost pressure or enter a safe mode to prevent engine damage.