Fix P20DA: STEP-BY-STEP diagnostic GUIDE!

The P20DA: Exhaust Aftertreatment Fuel Supply Control Circuit High indicates that the voltage in the fuel supply control circuit is higher than expected. This can cause the fuel supply control system to malfunction, potentially leading to improper fuel delivery in the exhaust aftertreatment system. The issue could be due to faulty wiring, a malfunctioning control valve, or a faulty control module.

P20DA – Quick Overview

CodeInformation
MeaningP20DA: Exhaust Aftertreatment Fuel Supply Control Circuit High
Is it serious?Yes, this can affect fuel delivery, leading to improper emissions control and possibly damaging the exhaust system.
Possible causes– High voltage in the fuel supply control circuit
– Faulty control valve
– Faulty control module
How to diagnose?– Measure voltage in the fuel supply control circuit
– Test the control valve
– Check the control module functionality

P20DA Meaning

The P20DA fault code indicates that there is a high voltage condition in the fuel supply control circuit for the exhaust aftertreatment system. Excessive voltage can cause the fuel supply control valve to malfunction, leading to overfueling or improper regulation of fuel in the aftertreatment process. The issue may arise from wiring problems, a malfunctioning fuel supply control valve, or a control module fault.

Step-by-step diagnostic guide

ActionDescriptionTools Needed
Check for Other CodesUse an OBD-II scanner to check for additional codes that may provide further insight into the high voltage condition.OBD-II Scanner
Measure Voltage in the Fuel Supply Control CircuitUse a multimeter to measure the voltage in the fuel supply control circuit and confirm it is within manufacturer specifications.Multimeter
Test the Control ValveUse a diagnostic tool to test the functionality of the fuel supply control valve and ensure it is not malfunctioning due to excessive voltage.Multimeter, Diagnostic Tool
Check the Control ModuleVerify that the control module is functioning properly and not sending excessive voltage to the control circuit.Diagnostic Tool
Repair or Replace Wiring/Control ValveIf high voltage is detected, inspect the wiring for shorts, excessive voltage, or damage, and repair or replace the fuel supply control valve as necessary.Wiring Kit, Replacement Valve
Clear the Code and Test DriveAfter 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 CodesAfter the test drive, rescan the vehicle to ensure the P20DA code does not return.OBD-II Scanner
Bluetooth OBD-II scanners

OBD-II scanner Buyer’s Guide

  • Scanner features explained
  • Different types of scanners
  • Scanners for coding/odometer/ECU/checks
  • Best picks + discount codes

Download PDF FREE

    Leave a Comment