OBD-II code · Powertrain (generic, extended)
P2ADD Reductant Tank Temperature Sensor B Circuit Intermittent/Erratic
The reductant tank B temperature sensor signal drops out or jumps intermittently. Loose connector or noisy ground.
Is it safe to drive with P2ADD?
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 Tank Temperature Sensor B, Wiring Harness, Scr Module
Related codes
- P205EReductant Tank Temperature Sensor A Circuit Intermittent/Erratic
- P2ADAReductant Tank Temperature Sensor B Range/Performance
- P2ADBReductant Tank Temperature Sensor B Circuit Low
- P2ADCReductant Tank Temperature Sensor B Circuit High
- P2ADEReductant Tank Temperature Sensor B Circuit
- P2ADFIntake Air System Leak Bank 2
- P2AE0Intake Air O2 Sensor Pumping Current Trim Circuit Open Bank 1
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.