Reductant Injection Valve Circuit Open (Bank 1 Unit 1)
The P2047 code indicates that the powertrain control module (PCM) has detected an open circuit in the reductant injection valve control circuit for Bank 1 Unit 1. This valve is part of the Selective Catalytic Reduction (SCR) system, which injects diesel exhaust fluid (DEF) into the exhaust stream to reduce NOx emissions. An open circuit means there is a break in the electrical path, preventing the valve from operating correctly. This can lead to increased emissions and potential derate of engine power.
01. Most Common Causes
- Open or shorted wiring in the reductant injection valve circuit
- Faulty reductant injection valve
- Corroded or damaged connector at the valve
- Blown fuse or relay for the SCR system
- Failed PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or derate mode
- Increased diesel exhaust fluid consumption
- Failed emissions test
- Possible white smoke from exhaust
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm P2047 and check for related codes.
Step 2: Visually inspect the reductant injection valve connector and wiring for damage, corrosion, or loose connections.
Step 3: Test the valve's resistance with a multimeter; compare to manufacturer specs (typically 2-5 ohms).
Step 4: Check for voltage at the valve connector with the ignition on; should see battery voltage on one pin.
Step 5: If voltage is present and resistance is out of spec, replace the valve. If no voltage, trace the circuit for opens or shorts.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
You can drive short distances, but the vehicle may enter a derate mode reducing power. Prolonged driving can cause further emissions system damage and may lead to a no-start condition.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and repair, including parts and labor. The valve itself costs around $30-$80, and labor is about $50-$100.