P2AAB — Engine Coolant Bypass Valve B Position Sensor Circuit Intermittent/Erratic
The engine coolant bypass valve B position sensor signal drops out or jumps intermittently. Loose connector or noisy ground.
General code reference. Confirm the definition and diagnostic procedure for your vehicle's year, model and engine. A stored code alone does not identify a failed part.
Affected components
- Engine coolant bypass valve b position sensor
- Wiring harness
- Ecm
Possible causes to check
These are possible checks, not a ranked diagnosis. Follow the vehicle manufacturer's test procedure before replacing parts.
- Sensor connector not seated
- Noisy ground reference
- Connector with intermittent contact under vibration
Diagnostic notes
- The malfunction indicator lamp may illuminate
Related codes
Sources
Check each reference's vehicle and model-year scope. General background links do not establish which fault is most likely on your vehicle.
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.