P2375 Turbocharger/Supercharger Inlet Pressure Sensor B Circuit Range/Performance

With P2375 the signal of compressor inlet pressure sensor B is electrically valid but implausible – stuck, offset or out of step with the other pressure values. No manufacturer publishes the B code; GM's 2018 table for the supercharged LT4 V8 describes the A counterpart P012B in detail. After a long enough engine-off period all induction pressures have equalised, so the reading must lie in the normal atmospheric range; with the engine turning between 400 and 6,200 rpm it is weighed against models of airflow, manifold pressure and throttle, where single model errors above 30 kPa count. GM rates the fault Type B, two trips. On a twin-turbo engine a clogged filter on one side or a leaking duct to compressor B can trigger it as readily as a drifting sensor.

Likely causes

Symptoms

• Check engine light after two trips
• Uneven boost between the two turbochargers
• Reduced power

Repair estimate

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

Related codes

References: gsi.ext.gm.com, law.cornell.edu, en.wikipedia.org.