← View Generic P0172 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2020 Chevrolet SILVERADO 1500 PICKUP

P0172: System Too Rich Bank 1

on 2020 Chevrolet SILVERADO 1500 PICKUP

Fix Cost
$30 - $300
Parts & Labor
Difficulty
3/5
1-3 hours
DIY Possible?
✅ Yes
Save money
Your Vehicle
2020 Chevrolet
SILVERADO 1500 PICKUP
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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 P0172 Mean on 2020 Chevrolet SILVERADO 1500 PICKUP?

The engine is running with too much fuel and not enough air on bank 1. The oxygen sensor is detecting a rich fuel mixture that the engine control module cannot adequately correct.
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Symptoms

  • • Black smoke from exhaust
  • • strong fuel odor
  • • poor fuel economy
  • • rough idle
  • • fouled spark plugs
  • • check engine light
  • • carbon buildup.
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Common Causes

  • • Faulty oxygen sensors
  • • leaking fuel injectors
  • • high fuel pressure
  • • dirty air filter
  • • faulty mass airflow sensor
  • • carbon canister purge valve stuck open.
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How to Fix P0172 on 2020 Chevrolet SILVERADO 1500 PICKUP

Replace faulty oxygen sensors, clean or replace fuel injectors, check fuel pressure regulator, replace air filter, clean mass airflow sensor, test purge valve operation.

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Need Maintenance Info for Your SILVERADO 1500 PICKUP?

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View 2020 Chevrolet SILVERADO 1500 PICKUP Specs

Parts for 2020 Chevrolet SILVERADO 1500 PICKUP

MAF Sensor Shop ↗ Fuel Filter Shop ↗ Vacuum Hoses Shop ↗ Fuel Injector Cleaner Shop ↗

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Related Diagnostic Codes

Other codes that may appear with P0172

P0175 Same System

System Too Rich Bank 2

Medium
P0420 Related Problem

Catalyst System Efficiency Below Threshold Bank 1

Medium
P0430 Related Problem

Catalyst System Efficiency Below Threshold Bank 2

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