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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Common Symptoms
- Check Engine Light on
- DEF system malfunction warning
- No DEF injection occurring
- Increased NOx emissions
- Speed limiter countdown may activate
Probable Causes (Ranked by Likelihood)
- 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
Step-by-Step Diagnostic Procedure
-
Confirm P2047 with freeze frame data
-
Check DEF injector fuse and relay
-
Inspect DEF injector connector and wiring for open circuits
-
Measure injector coil resistance and compare to specification
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.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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:
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