The 2020 Mercedes-Benz GLS Class has 6 recalls, the most serious being a loose ground connection under the front passenger seat that can cause wiring to overheat and catch fire.
A misrouted air conditioning drain hose is the next concern, and it appears in multiple filings reflecting the same underlying defect. When the hose is not installed correctly, water drains into the cabin instead of outside the vehicle, where it can short out electrical components. That short can disable the door locks, knock out the emergency call system, reduce engine power while driving, or prevent the vehicle from starting at all. On the occupant safety side, the locking springs in the third-row seat backrest may not have been fitted correctly during assembly, meaning the backrest can shift forward or backward in a crash instead of holding the occupant in place. There is also a label discrepancy on vehicles fitted with Michelin Primacy Tour A/S tires, where the maximum pressure printed on the tire sidewall reads lower than what the door placard and fuel cap label specify; the tire manufacturer has confirmed the tires can safely handle pressures above either figure, and no safety risk has been identified.
At a glance
What can fail
The bolt securing the 48V ground connection under the passenger seat may be loose. This can cause wiring to overheat and melt.
What the fix does
Mercedes-Benz will mail you instructions to visit a dealership. They will inspect the ground connection and tighten it if needed.
Summarized — see the official notice for exact wording, dates, and contacts.
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At a glance
What can fail
The air conditioning drain hose may be installed incorrectly, allowing water to leak into the vehicle and potentially short-circuit electrical components like door locks and the emergency call system, or reduce engine power.
What the fix does
A dealership will inspect the air conditioning hose installation and correct it if needed.
Summarized — see the official notice for exact wording, dates, and contacts.
At a glance
What can fail
The springs that lock the third-row seat backrest may not be installed correctly, so the backrest might not fully lock in place.
What the fix does
A dealership will inspect the third-row seat and replace the backrest if needed.
Summarized — see the official notice for exact wording, dates, and contacts.
At a glance
What can fail
Certain Michelin Primacy Tour A/S tires have a maximum pressure of 320 kPa (47 psi) marked on the sidewall, but the vehicle's tire loading label and gas cap show 300 kPa (44 psi). This creates inconsistent pressure information.
What the fix does
Mercedes-Benz has corrected the tire loading and information label on all new vehicles to ensure consistent maximum pressure specifications.
Summarized — see the official notice for exact wording, dates, and contacts.
At a glance
What can fail
A ground connection under the front passenger seat may not be properly tightened, allowing the connection and wiring to overheat.
What the fix does
Dealerships will inspect and tighten the 48 V electrical system ground connection under the front passenger seat as needed.
Summarized — see the official notice for exact wording, dates, and contacts.
At a glance
What can fail
The air conditioning drain hose may be installed incorrectly, allowing water to leak into the vehicle and potentially short-circuit electrical components like door locks and the emergency call system, or reduce engine power and starting ability.
What the fix does
A dealer will inspect and correct the air conditioning hose installation if needed. Do not use the air conditioning until the vehicle is inspected.
Summarized — see the official notice for exact wording, dates, and contacts.
