Powertrain
generic / SAE
P2AA9
Engine Coolant Bypass Valve B Position Sensor Circuit Low
Voltage on the engine coolant bypass valve B position sensor signal line is below the expected window. Wire shorted to ground or sensor short.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / numberA / A9
Possible causes
- Signal wire shorted to ground high
- Internal sensor short medium
- Connector pins corroded - high contact resistance low
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 150–700 €
- Estimated time: 0.5–3 h
- Component: engine coolant bypass valve b position sensor
- Component: wiring harness
- Component: ecm
- MIL / check engine light
Sources
References
sae:J2012