The P20F7: Reductant Injection Valve Stuck Open Bank 2 Unit 1 fault code indicates that the reductant injection valve in Bank 2 Unit 1 is stuck in the open position. This can lead to over-injection of reductant (Diesel Exhaust Fluid, DEF), affecting the performance of the Selective Catalytic Reduction (SCR) system and potentially causing emissions control issues. The problem could be caused by a faulty valve or issues within the reductant injection system.
P20F7 – Quick Overview
| Code | Information |
|---|---|
| Meaning | P20F7: Reductant Injection Valve Stuck Open Bank 2 Unit 1 |
| Is it serious? | Yes, an open valve can lead to over-injection of DEF, affecting emissions control and potentially damaging the SCR system. |
| Possible causes | – Reductant injection valve stuck open in Bank 2 Unit 1 – Faulty valve – Issues with the injection system |
| How to diagnose? | – Inspect and test the reductant injection valve for Bank 2 Unit 1 – Check the injection system for faults |
P20F7 Meaning
The P20F7 fault code means that the reductant injection valve in Bank 2 Unit 1 is stuck in the open position. This condition can lead to over-injection of DEF into the exhaust system, disrupting the balance of NOx reduction and potentially damaging the SCR system. The cause may be a malfunctioning valve or issues within the reductant injection system.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check for additional related codes that may provide further context for the stuck-open valve issue. | OBD-II Scanner |
| Inspect Reductant Injection Valve | Visually inspect the reductant injection valve in Bank 2 Unit 1 for signs of physical damage or malfunction that could cause it to remain stuck open. | Flashlight, Diagnostic Tool |
| Test the Reductant Injection Valve | Use a multimeter or diagnostic tool to test the functionality of the reductant injection valve and confirm whether it is stuck in the open position. | Multimeter, Diagnostic Tool |
| Inspect the Injection System | Inspect the wiring, sensors, and actuators of the reductant injection system for any faults that could be affecting the valve’s operation. | Diagnostic Tool, Multimeter |
| Repair or Replace Faulty Components | If the valve is confirmed to be faulty or if other issues in the injection system are identified, repair or replace the necessary components. | Replacement Valve, Tools |
| Clear the Code and Test Drive | After completing repairs, clear the fault code using an OBD-II scanner and test drive the vehicle to ensure the issue has been resolved. | OBD-II Scanner, Vehicle Manual |
| Recheck for Codes | After the test drive, rescan the vehicle to ensure the P20F7 code does not return. | OBD-II Scanner |
Free PDF: How to choose OBD2 scanner
I’ve made you a free PDF to choose the OBD2 scanner in 5 minutes.
✅ Which OBD2 scanner is best?
✅ Which type should you get (DIY, Pro, Hobby)
✅ What is the best scanner for the exact brand/feature (e.g best for BMW)
✅ How to get a Bi-Directional tool for as cheap as $40
✅ Discount coupons for scanners
PDF is 100% free and it is designed to help you pick a scanner in less than a few minutes! Not a boring 50-page guide.
Just tell me where to send it.
Hi, I am Juraj “Yuri” Lukacko. I got frustrated by unhelpful and scammy mechanics, so I decided to learn everything about car diagnostics myself. I test dozens of new car diagnostic tools every month along with learning new strategies to fix and customize cars. About Juraj Lukacko (Yuri)