What does code P01BB mean?

Q: What does code P01BB mean?

Engine Oil Temperature Sensor B Circuit Low. P01BB means the powertrain control module (PCM) has detected an abnormally low voltage on the signal circuit for engine oil temperature sensor B, which is typically a second temperature sensor used for monitoring oil condition or protecting the engine. The PCM expects a voltage within a calibrated range, and a low reading usually indicates a short to ground, a faulty sensor, or a wiring problem rather than a real overheating event.

DTC codes / P01xx · Fuel and air metering / P01BB

P01BBEngine Oil Temperature Sensor B Circuit Low

P01BB means the powertrain control module (PCM) has detected an abnormally low voltage on the signal circuit for engine oil temperature sensor B, which is typically a second temperature sensor used for monitoring oil condition or protecting the engine. The PCM expects a voltage within a calibrated range, and a low reading usually indicates a short to ground, a faulty sensor, or a wiring problem rather than a real overheating event.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.