P2062
Reductant/Regeneration Supply Control Circuit/Open
Auxiliary emissions control
Generic OBD-II
Medium
What it means
P2062 means the engine computer detects an open in the reductant/regeneration supply control circuit — the circuit that delivers diesel exhaust fluid (DEF) into the SCR system. The engine still runs, but without proper DEF supply the emissions system can't do its job, and an unresolved fault often triggers a reduced-power derate, so fix it promptly.
Medium
Can I keep driving? Yes for now — the engine runs, but this diesel emissions (SCR/DEF) fault can lead to reduced power if left unfixed; repair soon.
Common symptoms
What you'll notice
- Check-engine light on
- SCR/emissions warning message and possible reduced-power countdown
- Failed emissions readiness or increased NOx
Common causes
Most likely first
- Open circuit in the reductant/regeneration supply control wiringLikely
- Faulty reductant (DEF) supply pump or control valveCommon
- Damaged or corroded connector at the supply control componentCommon
- Failed powertrain control module (PCM)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and inspect the supply control connector and wiring for an open or corrosion.
- Check the control circuit for continuity against the wiring diagram; repair any open found.
- Test the reductant supply pump/valve operation and replace it if it doesn't respond.
- If wiring and component test good, have the PCM diagnosed. Clear the code and re-test.
FAQ
Quick answers
Is it safe to drive with P2062?+
Short-term yes, but the SCR system can force reduced power if the DEF supply fault persists, so don't delay the repair.
Can I just clear P2062?+
It returns until the open circuit or supply component is repaired.
Related codes
Often seen with P2062
Read & clear P2062 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX