The P20D7: Exhaust Aftertreatment Fuel Supply Control Circuit/Open indicates an open circuit in the fuel supply control circuit. This can prevent proper fuel delivery to the aftertreatment system, leading to inefficient emissions control. The issue may be caused by an open circuit in the wiring, a faulty fuel supply control valve, or a malfunction in the control module.
P20D7 – Quick Overview
| Code | Information |
|---|---|
| Meaning | P20D7: Exhaust Aftertreatment Fuel Supply Control Circuit/Open |
| Is it serious? | Yes, this can prevent proper fuel supply to the aftertreatment system, impacting emissions control and vehicle performance. |
| Possible causes | – Open circuit in the fuel supply control circuit – Faulty fuel supply control valve – Faulty control module |
| How to diagnose? | – Inspect the wiring for open circuits – Test the fuel supply control valve – Check the control module functionality |
P20D7 Meaning
The P20D7 fault code indicates that the fuel supply control circuit is open, which means there is a disconnection or break in the wiring. This can prevent the proper amount of fuel from being delivered to the exhaust aftertreatment system, affecting the vehicle’s emissions management. The issue could be due to faulty wiring, a malfunctioning fuel supply control valve, or a fault in the control module.
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 provide more details about the issue. | OBD-II Scanner |
| Inspect Wiring for Open Circuits | Visually inspect the wiring in the fuel supply control circuit for any breaks, disconnections, or damage. | Flashlight, Multimeter |
| Test the Fuel Supply Control Valve | Use a diagnostic tool to test the functionality of the fuel supply control valve to ensure it is operating correctly. | Multimeter, Diagnostic Tool |
| Check the Control Module | Verify that the control module is functioning properly and not causing the open circuit. | Diagnostic Tool |
| Repair or Replace Wiring/Valve | If an open circuit is found, repair the wiring or replace the fuel supply control valve as needed. | Wiring Kit, Replacement Valve |
| Clear the Code and Test Drive | After completing repairs, clear the code using an OBD-II scanner and test drive the vehicle to confirm that the issue is resolved. | OBD-II Scanner, Vehicle Manual |
| Recheck for Codes | After the test drive, rescan the vehicle to ensure the P20D7 code does not return. | OBD-II Scanner |
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