← View Generic P0138 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2020 Chevrolet SILVERADO 1500 PICKUP

P0138: Oxygen Sensor Circuit High Voltage Bank 1 Sensor 2

on 2020 Chevrolet SILVERADO 1500 PICKUP

Fix Cost
$50 - $250
Parts & Labor
Difficulty
2/5
30 mins - 1 hour
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 P0138 Mean on 2020 Chevrolet SILVERADO 1500 PICKUP?

The downstream oxygen sensor on bank 1 is reading consistently high voltage.
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Symptoms

  • • Failed emissions test
  • • check engine light
  • • rich running condition indication.
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Common Causes

  • • Faulty oxygen sensor
  • • fuel system running rich
  • • wiring short to power
  • • contaminated sensor.
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How to Fix P0138 on 2020 Chevrolet SILVERADO 1500 PICKUP

Replace oxygen sensor, diagnose rich fuel condition, repair wiring shorts, clean sensor area.

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Parts for 2020 Chevrolet SILVERADO 1500 PICKUP

Oxygen Sensor Shop ↗ O2 Sensor Socket Shop ↗

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Related Diagnostic Codes

Other codes that may appear with P0138

P0136 Sequential Code

Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2

Medium
P0137 Sequential Code

Oxygen Sensor Circuit Low Voltage Bank 1 Sensor 2

Medium
P0139 Sequential Code

Oxygen Sensor Circuit Slow Response Bank 1 Sensor 2

Medium
P0140 Sequential Code

Oxygen Sensor Circuit No Activity Bank 1 Sensor 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