The P20E7: Reductant Injection Air Pressure Too High fault code indicates that the air pressure in the reductant injection system is higher than expected. This high pressure can cause issues with the reductant (Diesel Exhaust Fluid, DEF) injection process, affecting emissions control. The issue may be caused by a faulty air pressure control valve or problems with the pressure regulation system.
P20E7 – Quick Overview
| Code | Information |
|---|---|
| Meaning | P20E7: Reductant Injection Air Pressure Too High |
| Is it serious? | Yes, high air pressure can damage components in the reductant system, leading to improper injection and emissions issues. |
| Possible causes | – High air pressure in the reductant injection system – Faulty air pressure control valve – Issues with pressure regulation |
| How to diagnose? | – Measure air pressure in the reductant system – Test the air pressure control valve – Inspect the pressure regulation system |
P20E7 Meaning
The P20E7 fault code means that the air pressure in the reductant injection system is too high. This can lead to over-injection of the reductant fluid or damage to the injection system components, reducing the effectiveness of the emissions control system. Common causes include a malfunctioning air pressure control valve or problems in the pressure regulation system.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check for additional codes that may help identify specific issues related to the air pressure system. | OBD-II Scanner |
| Measure Air Pressure in the Reductant System | Use a pressure gauge to measure the air pressure in the reductant injection system and ensure it is within the manufacturer’s specified range. | Pressure Gauge |
| Test the Air Pressure Control Valve | Use a diagnostic tool to test the functionality of the air pressure control valve and ensure it is properly regulating the air pressure. | Diagnostic Tool, Multimeter |
| Inspect the Pressure Regulation System | Inspect the pressure regulation system for issues, including faulty sensors, valves, or blocked lines that may cause excess pressure. | Flashlight, Diagnostic Tool |
| Repair or Replace Faulty Components | If the control valve or other components are faulty, repair or replace them to restore proper pressure regulation in the system. | Replacement Parts, Tools |
| Clear the Code and Test Drive | After repairs, clear the code using an OBD-II scanner and test drive the vehicle to confirm the issue has been resolved. | OBD-II Scanner, Vehicle Manual |
| Recheck for Codes | After the test drive, rescan the vehicle to ensure the P20E7 code does not return. | OBD-II Scanner |
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