P2377 code meaning
Turbocharger/Supercharger Inlet Pressure Sensor B Circuit High
Powertrain system Generic code P23xx codes Check engine light
What P2377 means
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.
P2377 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyEasy, DIY possible
- Typical labor0.3 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2377
- Check engine light on
- Implausibly high inlet pressure in live data
Common causes of P2377
- Most likelySignal wire shorted to 5 V reference or battery voltage
- PossibleSensor ground of sensor B open
- Less likelyMoisture bridging terminals in the connector
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Turbocharger inlet pressure sensor bSensor wiringSensor reference voltage
What each part of P2377 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 3 | Area: ignition system or misfire. |
| 77 | The exact fault in that area. |
What to do next
- Note P2377 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2377
What does P2377 mean?
P2377 means "Turbocharger/Supercharger Inlet Pressure Sensor B Circuit High". P2377 means sensor B ahead of the compressor delivers a voltage above its upper limit. It is a generic code, so it means the same on every make.
Is it safe to drive with P2377?
Drive gently and only to a workshop. With P2377 the car can go into limp mode (reduced power) to protect itself.
Will P2377 fail an emissions test?
Yes, it can. P2377 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2377 to fix?
Difficulty: easy. A typical repair takes 0.3 to 2 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P2377 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.