P012A - Turbocharger/Supercharger Inlet Pressure Sensor Circuit
A Turbocharger Inlet Pressure sensor measures the pressure in the air intake system prior to the Turbocharger.
Fault Code Explained
The ECM has detected an undefined fault with the Turbo Inlet Pressure Sensor signal. The signal may be outside of it’s normal operating parameters, not responding to engine changes as expected or providing values that are inconsistent with the current operating conditions.
If possible use a diagnostic computer to view live data readings for the sensor and compare to actual Inlet Pressure. Test sensor supply Voltage and output signal