OBD-II code · Powertrain (generic, extended)
P2AD0 Reductant Temperature Sensor B Circuit Intermittent/Erratic
The reductant temperature B sensor signal drops out or jumps intermittently. Loose connector or noisy ground.
Is it safe to drive with P2AD0?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelySensor connector not seated
- PossibleNoisy ground reference
- Less likelyConnector with intermittent contact under vibration
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
- P2ACDReductant Temperature Sensor B Range/Performance
- P2ACEReductant Temperature Sensor B Circuit Low
- P2ACFReductant Temperature Sensor B Circuit High
- P2AD1Throttle/Pedal Position Sensor/Switch C/G Voltage Correlation
- P2AD2Throttle/Pedal Position Sensor/Switch B/G Voltage Correlation
- P2AD3Throttle/Pedal Position Sensor/Switch A/G Voltage Correlation
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.