OBD-II code · Powertrain (generic, extended)
P2D5A Reductant Level Sensor A/B Correlation
The signals of the reductant level sensors A and B do not correlate within the calibrated tolerance. One sensor drifts or installation offset between channels.
Is it safe to drive with P2D5A?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyOne sensor characteristic drifted
- PossibleHarness incorrectly swapped between channels
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
- 0.3–2 h
- Emissions test
- Usually unaffected
- Parts involved
- Reductant Level Sensor A, Reductant Level Sensor B, Scr Module
Related codes
- P2D57Generator B Control Circuit Range/Performance
- P2D58Generator B Mechanical Performance
- P2D59Generator B Over Temperature
- P2D5BBattery Charging System Positive Contactor C Circuit
- P2D5CBattery Charging System Positive Contactor C Stuck Closed
- P2D5DBattery Charging System Positive Contactor C Stuck Open
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.