Powertrain
Definition only
Lights the check engine lamp
P2ADD: Reductant Tank Temperature Sensor B Circuit Intermittent/Erratic
Standardized SAE J2012 code · P2Axx codes
What does P2ADD mean?
The reductant tank B temperature sensor signal drops out or jumps intermittently. Loose connector or noisy ground.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Symptoms
- Check engine light or NOx warning on
- AdBlue/DEF level or quality warning
- Possible no-start countdown after ignore period
- Failed emissions inspection (NOx)
Common causes
- High Sensor connector not seated
- Medium Noisy ground reference
- Low Connector with intermittent contact under vibration
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P2ADD on the same make and model first.
P2ADD in the community
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