OBD-II code · Powertrain (generic, extended)

P2B22 Hybrid/EV Electronics Coolant Temperature Sensor B Circuit Low

The vehicle hybrid control module detects a circuit low fault on the coolant temperature sensor B that monitors the power electronics cooling loop.

Is it safe to drive with P2B22?

The car may go into limp mode (reduced power). Get it diagnosed before a long trip.

Common causes

  • Most likelySignal wire shorted to ground
  • PossibleInternal sensor short
  • Less likelyConnector pins corroded - high contact resistance

Repair at a glance

Difficulty
Medium
DIY friendly
Best left to a mechanic
Typical labour
0.5–3 h
Emissions test
Usually unaffected
Parts involved
Hybrid Electronics Coolant Temp Sensor B, Wiring Harness, Hybrid Control Module

Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.