Genesis G90 Problems Common Issues and Repair Costs
The Genesis G90 is the flagship luxury saloon from Genesis, created to compete directly with high-end rivals like the Mercedes-Benz S-Class, BMW 7 Series, and Audi A8. It is known for its elegant design, refined performance, and advanced safety systems. While the G90 is among the most reliable and comfortable luxury saloons, no car is completely problem-free. This guide explains the Genesis G90 model range, outlines common issues, and provides UK repair cost estimates to help you understand ownership costs.
Genesis G90 Model Overview
3.3T V6 Petrol
This twin-turbocharged 3.3-litre V6 engine delivers around 365 horsepower and smooth power delivery. It is strong and refined but can suffer from turbo wear or timing chain stretch over time.
3.5T V6 Petrol
The newer 3.5-litre turbo V6 offers around 375 horsepower and improved fuel efficiency. It provides excellent mid-range power but may develop cooling or oil leaks if servicing is delayed.
5.0 V8 Petrol (Discontinued)
This naturally aspirated V8 engine provides effortless performance and is known for its reliability. However, it can suffer from oil leaks and higher running costs.
Electrified G90 (EV)
The all-electric G90 uses dual motors with up to 320 miles of range. It is quiet and powerful, though early owners have reported occasional charging or software issues.
Common Genesis G90 Problems and UK Repair Costs
1. Turbocharger Failure
Symptoms: Whining noise, smoke from the exhaust, or reduced power.
Models Affected: 3.3T and 3.5T petrol.
Cause: Carbon build-up or oil flow restriction.
Repair Solution: Replace turbocharger and clean oil feed pipes.
Estimated UK Repair Cost: £900 to £1,400.
Always let the engine idle for a short time before shutting off to protect the turbo.
2. Timing Chain Wear
Symptoms: Rattling noise at cold start or engine light on.
Models Affected: 3.3T and 3.5T petrol.
Cause: Chain stretch due to worn tensioners or poor oil maintenance.
Repair Solution: Replace timing chain kit and tensioner.
Estimated UK Repair Cost: £700 to £1,200.
Changing the oil every 10,000 miles helps extend the chain life.
3. Cooling System Leaks
Symptoms: Coolant loss, overheating, or visible leaks.
Models Affected: All petrol engines.
Cause: Leaking radiator, thermostat housing, or water pump.
Repair Solution: Replace affected parts and refill coolant.
Estimated UK Repair Cost: £300 to £600.
Checking coolant levels monthly helps avoid overheating damage.
4. Oil Leaks
Symptoms: Oil marks under the car or burning oil smell.
Models Affected: 3.5T and 5.0 V8.
Cause: Gasket or seal wear.
Repair Solution: Replace valve cover or oil pan gasket.
Estimated UK Repair Cost: £250 to £450.
Inspect for leaks regularly to prevent oil loss and engine wear.
5. Air Suspension and Ride Height Issues
Symptoms: Knocking noise, uneven stance, or rough ride.
Models Affected: All, especially long-wheelbase versions.
Cause: Air strut leak or compressor failure.
Repair Solution: Replace air suspension strut or compressor unit.
Estimated UK Repair Cost: £600 to £1,400.
Inspect suspension yearly, especially after 50,000 miles.
6. Electrical and Infotainment Faults
Symptoms: Frozen screen, warning lights, or Bluetooth problems.
Models Affected: All.
Cause: Software glitches or weak 12V battery.
Repair Solution: Update system software or replace battery.
Estimated UK Repair Cost: £150 to £400.
Dealers often update software during scheduled services.
7. Brake Wear
Symptoms: Squealing, vibration, or soft pedal feel.
Models Affected: All.
Cause: Weight of the car or aggressive driving.
Repair Solution: Replace brake pads and discs.
Estimated UK Repair Cost: £400 to £700.
Replacing brake fluid every two years helps maintain braking efficiency.
8. Gearbox and Transmission Problems
Symptoms: Jerky gear shifts, slipping, or hesitation.
Models Affected: All automatic models.
Cause: Low fluid levels or worn valve body.
Repair Solution: Flush transmission oil and reprogram control module.
Estimated UK Repair Cost: £450 to £900.
Regular gearbox servicing keeps shifts smooth and extends lifespan.
9. Air Conditioning System Faults
Symptoms: Weak cooling or no air flow.
Models Affected: All.
Cause: Refrigerant leak or faulty compressor.
Repair Solution: Re-gas system or replace compressor.
Estimated UK Repair Cost: £250 to £600.
Use the air conditioning regularly to keep seals lubricated.
10. EV Charging and Battery Issues
Symptoms: Charging failure or reduced electric range.
Models Affected: Electrified G90.
Cause: Faulty connector or outdated software.
Repair Solution: Update software or replace charging port.
Estimated UK Repair Cost: £200 to £700.
Keep EV software updated and charge using approved equipment.
Typical UK Maintenance Costs
| Service Type | Frequency | Average UK Cost |
|---|---|---|
| Oil and Filter Change | Every 10,000 miles | £180 – £300 |
| Full Service | Every 20,000 miles | £300 – £500 |
| Brake Pads and Discs | Every 25,000 miles | £400 – £700 |
| Timing Chain Replacement | Every 60,000 miles | £700 – £1,200 |
| Air Suspension Repair | As needed | £600 – £1,400 |
How to Keep Your Genesis G90 Reliable
- Service regularly using manufacturer-approved parts and oil.
- Inspect coolant and oil levels every month.
- Update vehicle software during each service.
- Avoid short trips to prevent build-up in petrol engines.
- Check air suspension for leaks if the car sits idle for long periods.
Summary of Common Genesis G90 Problems
| Problem | Cause | UK Repair Cost |
|---|---|---|
| Turbocharger failure | Oil restriction | £900–£1,400 |
| Timing chain wear | Poor oil maintenance | £700–£1,200 |
| Cooling leak | Radiator or pump fault | £300–£600 |
| Oil leak | Gasket or seal wear | £250–£450 |
| Air suspension fault | Compressor or strut | £600–£1,400 |
| Electrical issue | Battery or software | £150–£400 |
| Brake wear | Heavy braking | £400–£700 |
| Gearbox fault | Fluid or software | £450–£900 |
| Air conditioning fault | Leak or compressor | £250–£600 |
| EV charging issue | Connector or software | £200–£700 |
Conclusion
The Genesis G90 offers a luxurious and refined driving experience that competes with the world’s best executive saloons. It delivers strong performance, impressive comfort, and advanced safety technology.
Although it is one of the more reliable luxury cars, issues such as turbo wear, air suspension faults, and timing chain noise can appear with age. Most of these problems are manageable and relatively affordable to fix for a car of this class.
Typical UK repair costs range from £150 for small jobs to about £1,400 for major repairs.
With regular servicing and gentle driving, the G90 can easily last beyond 150,000 miles while maintaining its comfort and performance.
If you are considering buying a used Genesis G90, a CAREXAMER pre-purchase inspection can help you identify hidden issues before committing to the purchase.
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