Powertrain
Definition only
Lights the check engine lamp
P2ADC: Reductant Tank Temperature Sensor B Circuit High
Standardized SAE J2012 code · P2Axx codes
What does P2ADC mean?
Voltage on the reductant tank B temperature sensor signal line is above the expected window. Wire shorted to B+ or sensor open.
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 Signal wire shorted to B+
- Medium Open sensor
- Low Connector pins corroded - high contact resistance
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P2ADC on the same make and model first.
P2ADC in the community
Ask about P2ADCNo one has posted about P2ADC yet
Share your vehicle, the tool you used and what you tested — the first thread helps everyone who searches for this code.
Describe your P2ADC problem