← View Generic B0238 Guide
Severity: Medium
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Vehicle-Specific Guide
This guide is customized for your 2021 Honda PASSPORT
B0238: B0238: Immobilizer System Malfunction
on 2021 Honda PASSPORT
Fix Cost
$50 - $200
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 B0238 Mean on 2021 Honda PASSPORT?
The immobilizer system has detected a malfunction, preventing the engine from starting. This code is typically set when the key fob battery is weak or the immobilizer system is faulty.
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Symptoms
- • Engine won't start
- • dashboard warning light is illuminated
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Common Causes
- • Weak or dead key fob battery
- • faulty immobilizer system
- • incorrect key fob programming
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How to Fix B0238 on 2021 Honda PASSPORT
Replace key fob battery, reprogram key fob, replace immobilizer system module
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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 B0238
B0236
Sequential Code
B0236: Seat Switch Circuit Malfunction
Medium
B0237
Sequential Code
B0237: Turn Signal Lamp Malfunction
Medium
B0239
Sequential Code
B0239: Audio System Malfunction
Medium
B0240
Sequential Code
B0240: 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