← View Generic P0402 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2020 Chevrolet SILVERADO 1500 PICKUP

P0402: Exhaust Gas Recirculation Flow Excessive Detected

on 2020 Chevrolet SILVERADO 1500 PICKUP

Fix Cost
$50 - $350
Parts & Labor
Difficulty
3/5
1-3 hours
DIY Possible?
✅ Yes
Save money
Your Vehicle
2020 Chevrolet
SILVERADO 1500 PICKUP
⚠️

Important for 2020 Chevrolet SILVERADO 1500 PICKUP Owners

Before starting repairs, verify which engine your 2020 Chevrolet SILVERADO 1500 PICKUP has. Check your VIN or engine code to ensure you order the correct parts.

📖 What Does P0402 Mean on 2020 Chevrolet SILVERADO 1500 PICKUP?

The EGR system is flowing too much exhaust gas back into the intake, causing performance issues.
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Symptoms

  • • Rough idle
  • • stalling
  • • poor acceleration
  • • black smoke from exhaust
  • • knocking
  • • check engine light.
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Common Causes

  • • EGR valve stuck open
  • • faulty EGR valve position sensor
  • • vacuum leaks causing excessive EGR flow
  • • carbon buildup preventing valve closure.
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How to Fix P0402 on 2020 Chevrolet SILVERADO 1500 PICKUP

Replace EGR valve, clean EGR valve and passages, repair vacuum system, replace EGR position sensor.

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Need Maintenance Info for Your SILVERADO 1500 PICKUP?

Get oil capacity, filter specs, and torque settings for your specific 2020 Chevrolet SILVERADO 1500 PICKUP.

View 2020 Chevrolet SILVERADO 1500 PICKUP Specs

Parts for 2020 Chevrolet SILVERADO 1500 PICKUP

EGR Valve Shop ↗ EVAP Canister Shop ↗ Purge Valve Shop ↗ Vacuum Lines Shop ↗

Essential Tool

Must Have

OBD2 Scanner

Read & clear codes on your 2020 Chevrolet SILVERADO 1500 PICKUP

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Related Diagnostic Codes

Other codes that may appear with P0402

P0400 Sequential Code

P0400: Emissions Control System Malfunction

Medium
P0401 Sequential Code

Exhaust Gas Recirculation Flow Insufficient Detected

Medium
P0403 Sequential Code

P0403: Emissions Control System Not Operating Within Normal Parameters

Medium
P0404 Sequential Code

Exhaust Gas Recirculation Circuit Range/Performance

Medium

💡 Why These Codes Are Related:

  • • Similar Issues: Same root cause or component failure
  • • Related Problems: Often occur together due to system interactions
  • • Sequential Codes: Progressive failure stages or multiple sensors
  • • Same System: Components within the same automotive system