Powertrain
Definition only
Lights the check engine lamp
P2378: Turbocharger Inlet Pressure Sensor B Circuit Intermittent or Erratic
Standardized SAE J2012 code · P23xx — Ignition system and misfire
What does P2378 mean?
Same as P2374 but the signal is intermittent or has spikes that the ECU cannot reconcile - typically a wiring or connector fault.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Symptoms
- Check engine light on
- Significant power loss / limp mode
- Possible blue or black smoke from exhaust
- Whistling or hissing sound from intake
Common causes
- High Intermittent contact at connector or terminal
- Medium Harness chafed or pinched
- Low Connector with intermittent contact under vibration
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P2378 on the same make and model first.
P2378 in the community
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