Reductant Injector Circuit Open (Bank 1 Unit 1)
The P2047 code means the vehicle's onboard diagnostic system has detected: Reductant Injector Circuit Open (Bank 1 Unit 1). This is a serious severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $300 - $900 (parts and labor)
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What Are the Symptoms of P2047?
- Check Engine Light on
- DEF system malfunction warning
- No DEF injection occurring
- Increased NOx emissions
- Speed limiter countdown may activate
What Causes P2047? (Most Likely First)
- Open circuit in DEF injector wiring Very High
- Failed DEF injector High
- Corroded injector connector Moderate
- Blown DEF injector fuse or relay Moderate
- PCM output driver failure Low
Can I Still Drive with P2047?
Short distances only. P2047 is rated serious severity. Keep trips short and get it diagnosed soon rather than waiting for symptoms to worsen.
Frequently Asked Questions
What does P2047 mean?
P2047 indicates an open circuit in the DEF injector wiring, meaning the injector cannot spray diesel exhaust fluid into the exhaust stream for NOx reduction.
Can I drive with a P2047 code?
Drive only short distances. Without DEF injection, NOx emissions are uncontrolled and many vehicles will impose a speed limiter.
How much does it cost to fix P2047?
Repairs cost $300 to $900, with DEF injector replacement being the most common and expensive fix.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose P2047?
-
Confirm P2047 with freeze frame data
-
Check DEF injector fuse and relay
-
Inspect DEF injector connector and wiring for open circuits
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Measure injector coil resistance and compare to specification
Sources 2
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
- Cross-checked against the SAE J2012:2002 DTC table (2026-08-27)archived scan of the SAE standard — readable copy, not SAE’s current edition
P2047 on Diesel, EV & Equipment
The same code ID appears across other engines and platforms. The diagnostic flow varies by manufacturer — these are the platform-specific breakdowns:
Which Vehicles Commonly Get P2047?
- 2009-2015 Volkswagen Jetta 2.0L TDI
- 2012-2018 BMW 328d 2.0L Diesel
- 2010-2016 Mercedes-Benz ML350 3.0L BlueTEC
- 2014-2020 Ram 3500 6.7L Cummins
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