← View Generic B1774 Guide
Severity: Medium
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Vehicle-Specific Guide
This guide is customized for your 2018 BMW X5
B1774: B1774: Body Control Module (BCM) Security System Malfunction
on 2018 BMW X5
Fix Cost
$200 - $500
Parts & Labor
Difficulty
3/5
1-2 hours
DIY Possible?
❌ No
Pro recommended
Your Vehicle
2018 BMW
X5
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Important for 2018 BMW X5 Owners
Before starting repairs, verify which engine your 2018 BMW X5 has. Check your VIN or engine code to ensure you order the correct parts.
📖 What Does B1774 Mean on 2018 BMW X5?
The Body Control Module (BCM) has detected a malfunction in the security system, which may cause the vehicle to be in a locked or alarm state.
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Symptoms
- • Alarm sounds
- • doors and trunk won't unlock
- • vehicle won't start
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Common Causes
- • Faulty BCM
- • faulty security sensor
- • faulty door lock actuator
- • wiring issue
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How to Fix B1774 on 2018 BMW X5
1. Check and clear any trouble codes. 2. Inspect and repair any damaged wiring. 3. Replace faulty security sensor or door lock actuator. 4. Update BCM software if necessary.
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Need Maintenance Info for Your X5?
Get oil capacity, filter specs, and torque settings for your specific 2018 BMW X5.
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Related Diagnostic Codes
Other codes that may appear with B1774
B1772
Sequential Code
B1772: Seat Position Sensor Circuit Malfunction
Medium
B1773
Sequential Code
B1773: Exterior Lighting Malfunction
Medium
B1775
Sequential Code
B1775: Audio System Fault
Medium
B1776
Sequential Code
B1776: 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