2021 Mercedes-Benz GLS Pre-Purchase Inspection Checklist
Known Issues — 2021 Mercedes-Benz GLS
CRITICAL
E-ACTIVE BODY CONTROL hydraulic pump failure warning
MODERATE
MBUX infotainment software freeze requiring OTA update
MODERATE
48V mild hybrid fault codes on GLS450 in cold weather
MODERATE
9G-Tronic shudder during light throttle cruise
MODERATE
GLS63 AMG oil leaks from front cam cover area
MODERATE
Third-row power seat recliner mechanism jam
What to Inspect
- Verify E-ACTIVE BODY CONTROL — check for warning on startup
- Test MBUX for freeze and check OTA version
- Check 48V mild hybrid system codes on GLS450
- Drive at light throttle for 9G-Tronic shudder
- Inspect GLS63 engine top for oil seeps
- Test third-row seat power functions
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-$1,350 |
| 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 |
| GLS63 cam cover gaskets | as needed | $900-$1,500 |
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