What is the 48V Electrical System Failure problem on a 2019 Mercedes-Benz GLE (V167)?

Reliability Guide

Common Problems with the
2019 Mercedes-Benz GLE (V167)

We've identified 1 known issue that can affect the 2019 Mercedes-Benz GLE (V167). 1 of these are serious faults that could be expensive to repair.

Known Issues

Serious

Moderate

Minor

The 2019 period has 1 more issue than the Mercedes-Benz GLE (V167) average across all year periods.

SeriousElectrics & Electronics

The 48V mild-hybrid system (EQ Boost) can fail, disabling the start-stop system and preventing the car from starting if the 12V system drains.

Most affected: GLE 450, GLE 300 d (later models)

Estimated cost: £1,000–£3,000Affects: 2019–2023

✓Check for outstanding software updates or recall history regarding the 48V system

✓Test the complex MBUX infotainment system thoroughly; ensure it doesn't freeze or reboot randomly, and verify all software updates have been applied.
✓Check for any 48V electrical system warnings; failure of the EQ Boost starter-generator is a known issue that can immobilize the vehicle.
✓Inspect the interior trim for rattles and squeaks, particularly from the dashboard and seats, which frustrated many early buyers.
✓Ensure the Airmatic or E-Active Body Control suspension functions flawlessly without dash warnings, as repairs to these advanced systems are eye-wateringly expensive.
✓Check the large alloy wheels for kerbing and verify tyre tread; replacing premium tyres on 20-inch+ rims is a significant expense.
✓On diesel models, check the AdBlue system history for NOx sensor replacements, a recurring theme on modern Mercedes diesels.