Powertrain, generic (extended)

P2376 Turbocharger/Supercharger Inlet Pressure Sensor B Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2376 is set when the output voltage of compressor inlet pressure sensor B drops below its lower limit. No maker documents the B code publicly; GM's A version P012C on the supercharged LT4 gives an idea of the scale. There the threshold is 3 % of the 5 V reference, equal to roughly 6 kPa – a value no intake can reach in reality. The check runs continuously with one sample every 12.5 ms and fails once 320 of 400 samples are below the limit, so a steady fault is caught within a five-second window; the code is Type B. Typical reasons are a signal lead touching ground, a broken 5 V feed or a dead sensor. The ECM falls back on a substitute value and may cap boost on that compressor.

Likely causes

Signal wire of sensor B shorted to ground
5 V reference to sensor B open
Sensor B failed

Symptoms

  • Check engine light on
  • Live data show an inlet pressure far below ambient
  • Possible boost limitation

Repair estimate

DifficultyEasyDIY possible
Parts and labour€20–250
Time0.3–1.5 h

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

Parts involved

turbocharger inlet pressure sensor bsensor wiringsensor reference voltage

Related codes

P2377P2374P2375P2378P012C

References: gsi.ext.gm.com, law.cornell.edu.