OBD-II code · Powertrain (generic, extended)
P2378 Turbocharger Inlet Pressure Sensor B Circuit Intermittent or Erratic
Same as P2374 but the signal is intermittent or has spikes that the ECU cannot reconcile - typically a wiring or connector fault.
Is it safe to drive with P2378?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyIntermittent contact at connector or terminal
- PossibleHarness chafed or pinched
- Less likelyConnector with intermittent contact under vibration
Symptoms
- Check engine light on
- Significant power loss / limp mode
- Possible blue or black smoke from exhaust
- Whistling or hissing sound from intake
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.6–1.6 h
- Emissions test
- Likely to fail
- Parts involved
- Turbo Inlet Pressure Sensor B, Turbo Inlet Pressure Wiring B
Related codes
- P2375Turbocharger Inlet Pressure Sensor B Circuit Range or Performance
- P2376Turbocharger Inlet Pressure Sensor B Circuit Low
- P2377Turbocharger Inlet Pressure Sensor B Circuit High
- P2379O2 Sensor Out of Range During Deceleration Bank 2 Sensor 2
- P237AO2 Sensor Exhaust Sample Error Bank 1 Sensor 2
- P237BO2 Sensor Exhaust Sample Error Bank 2 Sensor 2
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.