2020 Mercedes-Benz GLS 450 electrical system problems
18 owner complaints filed with NHTSA name the electrical system on the 2020 Mercedes-Benz GLS 450 — 51% of all complaints for this model year.
What owners report
“AMENDMENT TO ACTIVE CASE 11723015. CRITICAL AIRBAG & SAFETY DEFECTS. This files a safety defect amendment to open case 11723015. Diagnostic scans confirm central data bus network collapse on VIN [XXX] has migrated into safety-critical occupant restraint and visibility modules, violating 49 U.S.C. §…”
filed Jun 3, 2026
“The engine wiring harness insulation near the ignition coil connectors prematurely deteriorated due to prolonged exposure to engine heat in the turbocharger/exhaust area. Multiple wiring connectors exhibited brittle, cracked insulation with exposed conductors. The degraded wiring began shorting…”
filed May 10, 2026
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Related recalls
- A 48-Volt ground connection under the passenger seat may not be secured properly…Campaign 24V207000 · Mar 15, 2024
- A ground cable bolt for the 48V ground connection under the front passenger seat may not…Campaign 22V231000 · Apr 8, 2022
Related service bulletins
Complaint Traffic sign symbol for "Traffic Sign Assist" is blinking in instrument cluster without obvious cause usually with one of the following scenarios: • Flashing without a speed limit ("‑ ‑"). • Flashing when…
LI54.71-P-079104 · Service Bulletin/Repair Instructions · issued Aug 22, 2026Complaint 1. General Diagnostic Tips 2. One or More PARK Sensor Activations 3. Red Ring Around Vehicle 4. "Active Parking and Parking Assist Inoperative" on Instrument Cluster 5. Cameras 6. Other Park Topics. Cause…
LI54.65-P-080132 · Service Bulletin/Repair Instructions · issued Aug 12, 2026
Electrical System problems in other GLS 450 years
| Year | Reports | Share |
|---|---|---|
| 2019 GLS 450 | 2 | 10% |
Other reported problem areas on the 2020 Mercedes-Benz GLS 450
Counts are unique NHTSA complaints naming this component group. Complaints are unverified owner reports; mileage is computed only from complaints that included a usable odometer reading.