OBD-II code · Powertrain (generic, extended)

P2AA7 Engine Coolant Bypass Valve B Position Sensor Circuit

The ECM detects a generic fault on the engine coolant bypass valve B position sensor circuit. Reading cannot be used reliably for control.

Is it safe to drive with P2AA7?

Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.

Common causes

  • Most likelySensor failed
  • PossibleWiring or connector fault

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
Engine Coolant Bypass Valve B Position Sensor, Wiring Harness, Ecm

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