P2374 indicates the Powertrain Control Module (PCM) has detected a malfunction in the circuit for the turbocharger or supercharger inlet pressure sensor B. This sensor monitors air pressure before it enters the engine's intake manifold, and the code is set when the signal is out of expected range, missing, or corrupted.
The sensor itself has failed internally, producing an incorrect signal or no signal at all. This is the most common cause and the first component to suspect.
Damaged, chafed, or melted wiring, corroded connectors, or loose pins in the sensor circuit can cause intermittent or complete signal loss.
Leaks in the intake piping, intercooler, or turbo inlet can cause pressure readings that are outside the expected range, triggering the code.
A damaged or clogged intercooler can cause abnormal pressure readings that confuse the sensor circuit.
A failing turbocharger that cannot maintain proper boost pressure may produce sensor readings that trigger this code.
The engine computer itself may have failed, though this is the least likely cause and should only be considered after all other possibilities are ruled out.
It is not recommended. The vehicle may enter limp mode to protect the engine, and driving with incorrect boost pressure can potentially cause engine damage over time.
No. While some technicians may suggest replacing the PCM, it is rarely the cause. The sensor itself, its wiring, or related boost system issues are far more common.
A basic OBD-II scanner and multimeter are typically sufficient. An advanced scan tool that can display live sensor data is helpful but not strictly required.
Not always. If the wiring, connectors, or boost system have underlying issues, the new sensor may fail or the code may return. A thorough diagnosis of the entire circuit is important.