← View Generic B2278 Guide
Severity: High
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Vehicle-Specific Guide
This guide is customized for your 2021 Honda PASSPORT
B2278: B2278: Immobilizer System 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 B2278 Mean on 2021 Honda PASSPORT?
The immobilizer system has detected a malfunction, preventing the vehicle from starting or running. This code is typically set when the immobilizer system is not functioning correctly.
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Symptoms
- • Vehicle will not start
- • may have a flashing immobilizer light on the dashboard
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Common Causes
- • Faulty immobilizer module
- • faulty key fob
- • low battery in key fob
- • incorrect key fob programming
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How to Fix B2278 on 2021 Honda PASSPORT
1. Check the key fob battery level and replace if necessary. 2. Check the key fob programming and reprogram if necessary. 3. Replace the immobilizer module 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 B2278
B2276
Sequential Code
B2276: Seat Position Sensor Circuit Malfunction
Medium
B2277
Sequential Code
B2277: Exterior Lighting Malfunction
Medium
B2279
Sequential Code
B2279: Audio System Fault
Medium
B2280
Sequential Code
B2280: Airbag System Fault
High
💡 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