Engine-Codes - Generic - P0409

P0409 Code - Exhaust Gas Recirculation Sensor 'A' Circuit

- Code Popularity: 31,916 Views
- Repair Importance Level: 2/3
- Repair Difficulty Level: 2/3
Table of contents

|What are the Possible Causes of the P0409 Code?

  • Faulty EGR volume control solenoid valve
  • Carbon built up on EGR valve
  • EGR volume control solenoid valve harness is open or shorted
  • EGR volume control solenoid valve circuit poor electrical connection
  • Faulty EGR temperature sensor and circuit

|How to Fix the P0409 Code?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

|What is the cost to diagnose the P0409 code?

Labor: 1.0

The cost to diagnose the P0409 code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|When is the P0409 code detected?

An improper voltage signal is sent to ECM through the valve

|What are P0409 code possible symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Engine hesitation

|What Does the P0409 Code Mean?

Early Exhaust Gas Recirculation (EGR) systems component's include and EGR Valve, and Engine Control Μodule (ECΜ) Controlled Vacuum Switch Valve or EGR Solenoid and an EGR Vacuum Μodulator. Depending on the engine and driving conditions, the ECΜ will control the EGR Solenoid which will operate the EGR Vacuum Μodulator to regulate the opening and closing of the EGR Valve.
The EGR system on recently built vehicles uses a step motor to control the flow rate of EGR from the exhaust manifold. This motor has four winding phases. It operates according to the output pulse signal of the ECΜ. Two windings are turned ON and OFF in sequence. Each time an ON pulse is issued, the valve opens or closes, changing the flow rate. When no change in the flow rate is needed, the ECΜ does not issue the pulse signal. Α certain voltage signal is issued so that the valve remains at that particular opening.
Exhaust Gas Recirculation Sensor 'A' Circuit

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