Engine-Codes - Nissan - P0400 2000 NISSAN ALTIMA SEDAN

P0400 2000 NISSAN ALTIMA SEDAN Code - Exhaust Gas Recirculation Function No/Low Flow Detected

- Code Popularity: 1,946 Views
- Repair Importance Level: 2/3
- Repair Difficulty Level: 2/3
Table of contents

|What are the Possible Causes of the P0400 2000 NISSAN ALTIMA SEDAN Code?

  • Exhaust Gas Recirculation (EGR) volume control valve stuck closed
  • Faulty Exhaust Gas Recirculation (EGR) volume control solenoid valve
  • Faulty EGR Valve
  • Faulty EGR temperature sensor and circuit
  • Exhaust Gas Recirculation (EGR) solenoid valve harness is open or shorted
  • Exhaust Gas Recirculation (EGR) solenoid valve circuit poor electrical connection
  • Dead (Weak) battery

|How to Fix the P0400 2000 NISSAN ALTIMA SEDAN 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.

|P0400 2000 NISSAN ALTIMA SEDAN code tech notes

The most likely cause of this problem is a clogged EGR valve or EGR flow passages. Before replacing any parts, try cleaning the EGR valve, tube, and passages with throttle body or carburetor cleaner. Also, check for damage or loose vacuum hoses to the EGR valve.





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|What is the cost to diagnose the P0400 2000 NISSAN ALTIMA SEDAN code?

Labor: 1.0

The cost to diagnose the P0400 2000 NISSAN ALTIMA SEDAN 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 P0400 2000 NISSAN ALTIMA SEDAN code detected?

Exhaust Gas Recirculation (EGR) flow control is not responding

|What are P0400 2000 NISSAN ALTIMA SEDAN code possible symptoms?

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

|What Does the P0400 2000 NISSAN ALTIMA SEDAN 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.
Exhaust Gas Recirculation Function No/Low Flow Detected

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