OBD-II code · Powertrain (generic)
P065D Reductant System Malfunction Lamp Control Circuit
A circuit fault on the AdBlue malfunction warning lamp output - regulatory in many regions to alert the driver of NOx aftertreatment problems.
Is it safe to drive with P065D?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyOpen in lamp or wiring
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 h
- Emissions test
- Likely to fail
- Parts involved
- Reductant Warning Lamp
Related codes
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.