This page covers 3 recalls and 14 owner complaints for the 2018 Mercedes-Benz Gls 450.
The dominant pattern in 2018 GLS 450 complaints centers on the air suspension system. Multiple owners report the air suspension compressor failing repeatedly, sometimes within weeks of a dealer repair, leaving the vehicle riding extremely rough and, in some cases, difficult to control. Described failures include the compressor overheating, a malfunction warning appearing when the suspension tries to adjust, and the system cycling through parts like compressors and valves without resolving the underlying issue. A smaller number of complaints involve structure-related concerns and seating, including a third-row seat that owners report won't lock into position. One owner also describes repeated brake failures, with a mechanic attributing the issue to a brake line routed too close to a wheel component, resulting in a small hole developing in the line.
14
Total Complaints
1
Crash-Related
3
Fire-Related
By System
The 2018 Mercedes-Benz GLS 450 has 3 recalls, the most serious involving reduced braking performance that raises the risk of a crash.
The two remaining recalls both affect the vehicle's automatic emergency call system, which is designed to contact emergency services after a crash. In one case, the system can become disabled entirely, meaning a call for help may never go through. In the other, the system can transmit an incorrect location, sending emergency responders to the wrong place. Prior repair attempts did not fully resolve the underlying issue, which is why two separate campaigns exist for the same system.
At a glance
What can fail
A software error in the communication module's SIM card can prevent mobile network connection, which disables the emergency call (eCall) system.
What the fix does
The communication module software will be updated at no cost through an over-the-air update or by a dealer.
We may earn a commission for purchases made through these links.
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 →
Summarized — see the official notice for exact wording, dates, and contacts.
At a glance
What can fail
The communication module software may fail to send your vehicle's correct location to emergency services when the eCall system activates during a crash.
What the fix does
A dealer will update the communication module software, or the update will be sent over-the-air, at no cost.
Summarized — see the official notice for exact wording, dates, and contacts.
At a glance
What can fail
The rear brake caliper pistons may lack proper coating, allowing gas to enter the rear brake hydraulic circuit and temporarily reduce braking performance.
What the fix does
Dealers will bleed the rear axle brake system to remove gas and restore proper braking function.
Summarized — see the official notice for exact wording, dates, and contacts.
