OBD-II code · Powertrain (generic, extended)
P2ACD Reductant Temperature Sensor B Range/Performance
The reductant temperature B signal does not match plausibility checks against related signals. Sensor drift.
Is it safe to drive with P2ACD?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelySensor characteristic drifted
- PossibleSensor mounting displaced from reference path
- Less likelySensor element aged beyond calibration window
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)
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.3–1.5 h
- Emissions test
- Likely to fail
- Parts involved
- Reductant Temperature Sensor B, Wiring Harness, Ecm
Related codes
- P2ACACharge Air Cooler Coolant Temperature Sensor B Circuit High
- P2ACBCharge Air Cooler Coolant Temperature Sensor B Circuit Intermittent/Erratic
- P2ACCReductant Temperature Sensor B Circuit
- P2ACEReductant Temperature Sensor B Circuit Low
- P2ACFReductant Temperature Sensor B Circuit High
- P2AD0Reductant Temperature Sensor B Circuit Intermittent/Erratic
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.