2020 Mercedes-Benz GLS Pre-Purchase Inspection Checklist
Known Issues — 2020 Mercedes-Benz GLS
CRITICAL
E-ACTIVE BODY CONTROL hydraulic suspension warning (if equipped)
MODERATE
MBUX infotainment software instability on early X167 units
MODERATE
48V mild hybrid fault codes on GLS450
MODERATE
9G-Tronic transmission shudder at light throttle
MODERATE
Third-row seat fold motor failure
MODERATE
Sunroof water leak from drain tube blockage
What to Inspect
- Check E-ACTIVE BODY CONTROL for warning lights on startup
- Test MBUX fully — reboot and test all screens
- Check 48V mild hybrid fault codes
- Drive at light throttle 30-50 mph for transmission shudder
- Test third-row seat fold motor cycle
- Check sunroof drainage channels
Expected Maintenance Costs
| Service | Interval | Cost |
|---|---|---|
| Service A (oil & filter) | every 10,000 miles | $400-$580 |
| Service B (full inspection) | every 20,000 miles | $850-$1,300 |
| Air spring replacement (each) | as needed | $1,200-$2,200 |
| Transmission fluid service | every 40,000 miles | $500-$750 |
| Brake pads and rotors (front) | every 25,000-35,000 miles | $1,000-$1,600 |
| 48V mild hybrid battery check | every 40,000 miles | $250-$450 |
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