2020 Mercedes-Benz GLE 450 electrical system problems

What owners report

• “My vehicle was in for a normal service to have the spark plugs replaced. However I was told that the engine wiring harness had become brittle (apparently a common and reoccurring problem with my vehicle) and would likely cause misfiring after changing spark plugs. This did indeed happen and if I…”

  filed Apr 21, 2026

• “Engine compartment heat causes wiring harness insulation to melt and Electrical shorting while driving. Engine has lack of power and acceleration due to heat damage to the engine harness. Check Engine light came on. This is a potential fire risk and should be address by MBUSA. This is a know issue…”

  filed Feb 9, 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
• Instrument cluster software may deactivate the illumination of certain interior switches…
  Campaign 20V089000 · Feb 14, 2020

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, 2026

• Complaint 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

Other reported problem areas on the 2020 Mercedes-Benz GLE 450