P2062
Reductant/Regeneration Supply Control Circuit/Open
The control line that energises the DEF supply pump or regeneration heating circuit is open — no continuity through the load or harness.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
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)
Common causes
Ordered by how often each turns out to be the cause.
- Open windingCommon
- Open wirePossible
- Pin pushed back out of connector bodyLess likely
Parts involved
- Reductant Supply Pump
- Reductant Supply Relay
P2062 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.