OBD-II code · Powertrain (generic, extended)
P2ADC Reductant Tank Temperature Sensor B Circuit High
Voltage on the reductant tank B temperature sensor signal line is above the expected window. Wire shorted to B+ or sensor open.
Is it safe to drive with P2ADC?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelySignal wire shorted to B+
- PossibleOpen sensor
- 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
- P205DReductant Tank Temperature Sensor A Circuit High
- P2AD9Reductant Pump Motor Position Sensor Circuit High
- P2ADAReductant Tank Temperature Sensor B Range/Performance
- P2ADBReductant Tank Temperature Sensor B Circuit Low
- P2ADDReductant Tank Temperature Sensor B Circuit Intermittent/Erratic
- P2ADEReductant Tank Temperature Sensor B Circuit
- P2ADFIntake Air System Leak Bank 2
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.