← View Generic P0691 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2020 Chevrolet SILVERADO 1500 PICKUP

P0691: P0691: Engine Control Module (ECM) Output Circuit Malfunction

on 2020 Chevrolet SILVERADO 1500 PICKUP

Fix Cost
$100 - $500
Parts & Labor
Difficulty
3/5
1-2 hours
DIY Possible?
❌ No
Pro recommended
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 P0691 Mean on 2020 Chevrolet SILVERADO 1500 PICKUP?

The Engine Control Module (ECM) output circuit has malfunctioned, preventing the ECM from sending the correct signals to other engine control systems.
⚠️

Symptoms

  • • Engine performance issues
  • • poor fuel economy
  • • rough idle
  • • and intermittent stalling.
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Common Causes

  • • Faulty ECM output circuit
  • • wiring damage
  • • or a malfunctioning ECM.
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How to Fix P0691 on 2020 Chevrolet SILVERADO 1500 PICKUP

1. Check the ECM output circuit for damage or corrosion. 2. Inspect and clean the wiring harness. 3. Replace the ECM if faulty.

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Parts for 2020 Chevrolet SILVERADO 1500 PICKUP

ECM Shop ↗ wiring harness Shop ↗

Essential Tool

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Related Diagnostic Codes

Other codes that may appear with P0691

P0689 Sequential Code

P0689: Engine Control Module (ECM) Output Circuit Malfunction

Medium
P0690 Sequential Code

P0690: Engine Control Module (ECM) Output Circuit Malfunction

Medium
P0692 Sequential Code

P0692: Engine Control Module (ECM) Output Circuit Malfunction

Medium
P0693 Sequential Code

P0693: Engine Control Module (ECM) Output Circuit Malfunction

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