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
Related codes
- P23C3Engine Coolant Bypass Valve C Position Sensor Circuit
- P26A4Engine Coolant Bypass Valve A Position Sensor Circuit
- P2AA4Cold Start EGR B Flow Excessive Detected
- P2AA5EGR Cooler Bypass Control Circuit Driver Current/Temperature Too High Bank 1
- P2AA6EGR Cooler Bypass Control Circuit Driver Current/Temperature Too High Bank 2
- P2AA8Engine Coolant Bypass Valve B Position Sensor Range/Performance
- P2AA9Engine Coolant Bypass Valve B Position Sensor Circuit Low
- P2AAAEngine Coolant Bypass Valve B Position Sensor Circuit High
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.