Powertrain, generic (extended)

P2374 Turbocharger/Supercharger Inlet Pressure Sensor B Circuit

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2374 covers any wiring or sensor-side failure of a second pressure sensor mounted upstream of a compressor. Where the letter B belongs is the manufacturer's choice; on parallel twin-turbo V engines, where each turbocharger serves one cylinder bank, a second inlet sensor for the other compressor is the obvious candidate. No manufacturer documents P2374 publicly – GM's supercharged V8 (P012B–P012D) and Ford's 2023 diesels (P012A) only use A codes. Ford's digital SENT sensor shows how such a general code can arise: it is set when the sensor itself signals an internal error or its data stay beyond a threshold for 5 s, while a lost data link counts separately as a U code. The ECM then substitutes a value, usually close to ambient pressure, and may limit boost on that side.

Likely causes

Connector or wire of sensor B open, corroded or shorted
Sensor B reports an internal error
Sensor supply voltage missing

Symptoms

  • Check engine light on
  • Reduced boost or power

Repair estimate

DifficultyEasyDIY possible
Parts and labour€20–300
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

P2375P2376P2377P2378P012A

References: law.cornell.edu, fordservicecontent.com, en.wikipedia.org.