What Does P2047 Mean?
The ECM has detected an open circuit in the reductant (DEF) injector control circuit for Bank 1 Unit 1. The injector is not responding to commands or has no electrical continuity.
Common Causes
35%
Failed DEF injector with open internal coil winding
30%
Broken or disconnected wiring between ECM and DEF injector
20%
Corroded or damaged injector connector preventing electrical contact
10%
Blown fuse or open relay in DEF injector power circuit
5%
ECM driver circuit failure for DEF injector control
Diagnostic Steps
1
Step 1: Inspect DEF injector connector for damage, corrosion, or loose pins
2
Step 2: Measure resistance across DEF injector terminals - should be 2-8 ohms typically
3
Step 3: Check continuity of wiring from injector connector back to ECM
4
Step 4: Verify power and ground supply to DEF injector with key on
5
Step 5: Monitor injector command signal from ECM with scope or test light during operation
Estimated Repair Cost
$200 - $800
Parts + labor, varies by vehicle and location
The ECM has detected an open circuit in the reductant (DEF) injector control circuit for Bank 1 Unit 1. The injector is not responding to commands or has no electrical continuity.
The most common cause of P2047 (Reductant Injection Valve Circuit/Open Bank 1 Unit 1) is: Failed DEF injector with open internal coil winding
Typical repair costs for P2047 range from $200 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive but SCR system will not function, resulting in increased emissions. May cause engine derate after a set period per EPA regulations.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2047 to identify the root cause.
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Quick Info
Category
Powertrain
System
Emissions Control - SCR System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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