← View Generic P0505 Guide
Severity: Medium
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Vehicle-Specific Guide
This guide is customized for your 2021 Honda PASSPORT
P0505: Idle Control System Malfunction
on 2021 Honda PASSPORT
Fix Cost
$50 - $300
Parts & Labor
Difficulty
3/5
1-2 hours
DIY Possible?
✅ Yes
Save money
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 P0505 Mean on 2021 Honda PASSPORT?
The idle air control system is not maintaining proper idle speed. This affects engine idle quality and stalling.
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Symptoms
- • Rough or erratic idle
- • stalling at idle
- • high or low idle speed
- • engine dies when coming to a stop.
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Common Causes
- • Dirty or faulty idle air control valve
- • carbon buildup in throttle body
- • vacuum leaks
- • faulty throttle position sensor.
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How to Fix P0505 on 2021 Honda PASSPORT
Clean or replace idle air control valve, clean throttle body, repair vacuum leaks, replace throttle position sensor.
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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 P0505
P0503
Sequential Code
P0503: Idle Air Control (IAC) Motor Circuit Malfunction
Medium
P0504
Sequential Code
P0504: Idle Air Control (IAC) Valve Circuit Malfunction
Medium
P0506
Sequential Code
Idle Control System RPM Lower Than Expected
Medium
P0507
Sequential Code
Idle Control System RPM Higher Than Expected
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