P2377Turbocharger/Supercharger Inlet Pressure Sensor B Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2377 means sensor B ahead of the compressor delivers a voltage above its upper limit. Publicly no manufacturer defines this B code, so GM's P012D for the supercharged LT4 serves as a reference: it trips above 97 % of the 5 V reference, which equals about 124 kPa at that sensor, again with 320 failed samples out of 400 at 12.5 ms intervals and Type B. Upstream of a compressor the pressure cannot rise far above ambient, so such a reading is not physical. Typical faults are a signal wire touching the 5 V supply or battery voltage and an interrupted sensor ground, after which the output rises to the reference. Moisture that has crept into the connector can also create a path to the supply. P2376 is the opposite low-voltage case.
- What you may notice
- Check engine light on
- Implausibly high inlet pressure in live data
- Likely causes
- LikelySignal wire shorted to 5 V reference or battery voltage
- PossibleSensor ground of sensor B open
- RareMoisture bridging terminals in the connector
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Easy · Often possible to do yourself.Typical cost: €20 – €300
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.