← View Generic B0939 Guide
Severity: Medium
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Vehicle-Specific Guide
This guide is customized for your 2018 BMW X5
B0939: B0939: Window Regulator Motor Circuit Malfunction
on 2018 BMW X5
Fix Cost
$150 - $300
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 B0939 Mean on 2018 BMW X5?
The B0939 code indicates a malfunction in the window regulator motor circuit, which controls the movement of the window glass.
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Symptoms
- • Window fails to move
- • or moves erratically
- • when operated from the driver's door switch or the key fob.
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Common Causes
- • Faulty window regulator motor
- • faulty door switch
- • wiring issue
- • or blown fuse.
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How to Fix B0939 on 2018 BMW X5
Disconnect the battery to reset the system. Check the fuse and replace it if blown. Inspect the wiring and repair or replace as needed. Replace the window regulator motor if faulty.
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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 B0939
B0937
Sequential Code
B0937: Climate Control Actuator Malfunction
Medium
B0938
Sequential Code
B0938: Door Lock Actuator Circuit Malfunction
Medium
B0940
Sequential Code
B0940: Seat Position Sensor Malfunction
Medium
B0941
Sequential Code
B0941: Body System Malfunction - Lighting
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