This page covers 1 recall and 11 owner complaints for the 2018 BMW X4.
Electrical system complaints dominate what owners of the 2018 BMW X4 report, often tied to water pump failures that allow coolant to leak into electrical components. Several owners describe a cascade of failures: the water pump corrodes or fails without warning, coolant reaches the engine control module and throttle body, and the vehicle loses power or produces burning smells. In a few cases owners noticed a whining noise before the failure; in others the first sign was an overheating warning while driving on a highway. Engine complaints follow a similar thread, with the coolant-electrical interaction appearing to be the common factor. Brake complaints are limited to a single report describing brake failure following dealer service, so that account stands alone rather than reflecting a broader pattern.
11
Total Complaints
2
Crash-Related
1
Fire-Related
By System
At a glance
What can fail
The electrical connector on the water pump may not be properly sealed, allowing water to enter and cause an electrical short circuit.
What the fix does
Dealers will inspect the water pump, replace it and the connector if needed, and install a protective shield.
Summarized — see the official notice for exact wording, dates, and contacts.
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Complaints are owner-reported and reflect individual experiences, not confirmed defects. They are distinct from recalls. Data sourced from the national vehicle safety complaint database. See trending complaints →
