P2047
Reductant Injection Valve Circuit/Open Bank 1 Unit 1
Diesel SCR emissions
Generic OBD-II
Medium
What it means
P2047 is a diesel emissions code meaning the control circuit for the reductant (DEF/urea) injection valve on bank 1, unit 1 is open. That injector meters diesel exhaust fluid into the SCR system to cut NOx. The engine still starts and runs, but with the injector dead the emissions system can raise a warning and eventually reduce power. The usual cause is open wiring or a failed injector.
Medium
Can I keep driving? The engine still starts and drives, but a dead DEF injector raises NOx and the emissions system can force reduced power or a limp mode — repair it before it derates.
Common symptoms
What you'll notice
- Check-engine light on
- DEF/emissions system warning message
- Possible reduced power or limp mode if it persists
- Higher NOx / failed emissions test
Common causes
Most likely first
- Open in the reductant (DEF) injector wiring or connectorLikely
- Failed reductant injection valve (DEF injector)Common
- Poor or corroded electrical connection at the injectorCommon
- Faulty DEF/emissions control module or PCMLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data to confirm the open-circuit fault on bank 1 unit 1.
- Inspect the injector wiring and connector for opens, chafing, or corrosion.
- Measure the injector coil resistance against spec.
- Replace the reductant injection valve if the circuit is open internally.
- Verify DEF dosing per the manufacturer procedure, then clear and re-test.
FAQ
Quick answers
Is it safe to drive with P2047?+
Short-term yes, but the DEF system may derate power, and you'll fail emissions, so repair it soon.
Can I just clear P2047?+
It returns until the open circuit or injector is repaired, and any derate countdown can resume.
Related codes
Often seen with P2047
Read & clear P2047 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