OBD-II code · Powertrain (generic, extended)
P2ADB Reductant Tank Temperature Sensor B Circuit Low
Voltage on the reductant tank B temperature sensor signal line is below the expected window. Wire shorted to ground or sensor short.
Is it safe to drive with P2ADB?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelySignal wire shorted to ground
- PossibleInternal sensor short
- Less likelyConnector pins corroded - high contact resistance
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
- P205CReductant Tank Temperature Sensor A Circuit Low
- P2AD8Reductant Pump Motor Position Sensor Circuit Low
- P2AD9Reductant Pump Motor Position Sensor Circuit High
- P2ADAReductant Tank Temperature Sensor B Range/Performance
- P2ADCReductant Tank Temperature Sensor B Circuit High
- P2ADDReductant Tank Temperature Sensor B Circuit Intermittent/Erratic
- P2ADEReductant Tank Temperature Sensor B Circuit
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.