OBD-II code · Powertrain (generic)
P01BB Engine Oil Temperature Sensor B Circuit Low
Engine oil temp sensor B signal voltage below expected range. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
Is it safe to drive with P01BB?
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
- Less likelyConnector pins corroded - high contact resistance
- Less likelyHarness chafing through insulation
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–2 h
- Emissions test
- Likely to fail
- Parts involved
- Oil Temp Sensor B, Sensor Wiring
Related codes
- P01B8Alternative Fuel Rail Temperature Sensor Circuit Intermittent/Erratic
- P01B9Engine Oil Temperature Sensor B Circuit
- P01BAEngine Oil Temperature Sensor B Range/Performance
- P01BCEngine Oil Temperature Sensor B Circuit High
- P01BDEngine Oil Temperature Sensor B Circuit Intermittent/Erratic
- P01BEFuel Rail Pressure Sensor Circuit Bank 2
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.