Powertrain
Definition only
Lights the check engine lamp
P2ACC: Reductant Temperature Sensor B Circuit
Standardized SAE J2012 code · P2Axx codes
What does P2ACC mean?
The ECM detects a generic fault on the reductant temperature B sensor circuit. Reading cannot be used reliably for control.
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 failed
- Medium Wiring or connector fault
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P2ACC on the same make and model first.
P2ACC in the community
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