← View Generic P0691 Guide
Severity: Medium
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Vehicle-Specific Guide
This guide is customized for your 2021 Honda PASSPORT
P0691: P0691: Engine Control Module (ECM) Output Circuit Malfunction
on 2021 Honda PASSPORT
Fix Cost
$100 - $500
Parts & Labor
Difficulty
3/5
1-2 hours
DIY Possible?
❌ No
Pro recommended
Your Vehicle
2021 Honda
PASSPORT
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Important for 2021 Honda PASSPORT Owners
Before starting repairs, verify which engine your 2021 Honda PASSPORT has. Check your VIN or engine code to ensure you order the correct parts.
📖 What Does P0691 Mean on 2021 Honda PASSPORT?
The Engine Control Module (ECM) output circuit has malfunctioned, preventing the ECM from sending the correct signals to other engine control systems.
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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 2021 Honda PASSPORT
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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Need Maintenance Info for Your PASSPORT?
Get oil capacity, filter specs, and torque settings for your specific 2021 Honda PASSPORT.
View 2021 Honda PASSPORT SpecsParts for 2021 Honda PASSPORT
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