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.

Real-world scan data

Seen in

416

scans in the past year

Found in

0.1%

of scans

0.1%

of scans that found faults

Appears alongside · share of P2047 scans

P2201in 29.1% of scans

P202Din 28.1% of scans

P208Ain 25.5% of scans

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

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.

Read & clear P2047 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX