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Vehicle-Specific Guide
This guide is customized for your 2018 BMW X5
B1990: B1990: Body Control Module (BCM) Security System Malfunction
on 2018 BMW X5
Fix Cost
$100 - $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 B1990 Mean on 2018 BMW X5?
The Body Control Module (BCM) has detected a security system malfunction, which can prevent the vehicle from starting or running.
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Symptoms
- • Vehicle won't start
- • alarm sounds continuously
- • or security light on dashboard
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Common Causes
- • Faulty BCM
- • faulty security sensor
- • or wiring issue
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How to Fix B1990 on 2018 BMW X5
1. Check BCM fuse and replace if blown. 2. Check security sensor connections and clean or replace if necessary. 3. Check wiring for damage or corrosion and repair if necessary. 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 B1990
B1988
Sequential Code
B1988: Seat Switch Circuit Malfunction
Medium
B1989
Sequential Code
B1989: Turn Signal/Hazard Light Malfunction
Medium
B1991
Sequential Code
B1991: Audio System Malfunction
Medium
B1992
Sequential Code
B1992: Airbag System Fault
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