OBD-II code · Powertrain (generic, extended)
P2C34 Crankcase Pressure Sensor B Circuit Low
The ECM detects a circuit low fault on the crankcase pressure sensor b circuit. Reading cannot be used reliably for control.
Is it safe to drive with P2C34?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySignal wire shorted to ground
- PossibleInternal sensor short
- Less likelyConnector pins corroded - high contact resistance
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.3–1.5 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Crankcase Pressure Sensor B, Wiring Harness, Ecm
Related codes
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.