← View Generic C0309 Guide
Severity: Medium
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Vehicle-Specific Guide
This guide is customized for your 2021 Honda PASSPORT
C0309: C0309: Brake System Pressure Sensor Circuit Malfunction
on 2021 Honda PASSPORT
Fix Cost
$100 - $300
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 C0309 Mean on 2021 Honda PASSPORT?
The brake system pressure sensor circuit has malfunctioned, indicating a problem with the brake system's ability to regulate pressure.
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Symptoms
- • Spongy brake pedal
- • low brake fluid level
- • brake warning light on
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Common Causes
- • Faulty brake pressure sensor
- • clogged brake fluid lines
- • air in brake system
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How to Fix C0309 on 2021 Honda PASSPORT
1. Check brake fluid level and top off as needed. 2. Bleed brake system to remove air. 3. Replace faulty brake pressure 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 C0309
C0307
Sequential Code
C0307: Wheel Speed Sensor Malfunction
Medium
C0308
Sequential Code
C0308: Anti-lock Brake System (ABS) Pump Control Module Circuit Malfunction
High
C0310
Sequential Code
C0310: Suspension Damper or Mount Fault
Medium
C0311
Sequential Code
C0311: Steering Column Position Sensor 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