← View Generic B3846 Guide
Severity: Medium
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Vehicle-Specific Guide
This guide is customized for your 2021 Honda PASSPORT
B3846: B3846: 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 B3846 Mean on 2021 Honda PASSPORT?
The immobilizer system has detected a malfunction, preventing the vehicle from starting. This code is often caused by a faulty immobilizer module, key fob, or wiring issue.
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Symptoms
- • Vehicle will not start
- • may display a 'security system malfunction' message on the dashboard
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Common Causes
- • Faulty immobilizer module
- • key fob
- • wiring issue
- • or incorrect key fob battery
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How to Fix B3846 on 2021 Honda PASSPORT
1. Check key fob battery level and replace if necessary. 2. Inspect wiring for damage or corrosion and repair as needed. 3. Replace 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 B3846
B3844
Sequential Code
B3844: Seat Position Sensor Circuit Malfunction
Medium
B3845
Sequential Code
B3845: Exterior Lighting Malfunction
Medium
B3847
Sequential Code
B3847: Audio System Fault
Medium
B3848
Sequential Code
B3848: 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