What are the most common Lexus GX problems?

According to Au7o's analysis of 3,100+ owner reports, the 2005 Lexus GX has 2 documented issues. The most frequently reported are: Secondary Air Injection Pump Failure, Center Differential Lock Actuator Failure. None are rated critical, but regular maintenance is recommended.

Is the Lexus GX reliable?

The 2005 Lexus GX has 2 known issues documented across 3,100+ owner reports. No issues are rated critical, suggesting generally good reliability. Regular maintenance following the manufacturer's schedule helps prevent many common problems.

How much does it cost to fix common Lexus GX problems?

Repair costs for known Lexus GX issues range from $400 to $2,000, depending on the specific problem and whether you choose DIY or professional repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What is the 2003-2009 Lexus GX Secondary Air Injection Pump Failure?

The secondary air injection (SAI) system pump and switching valves fail due to moisture intrusion and corrosion. The SAI pump introduces fresh air into the exhaust during cold starts to reduce emissions, but the pump motor corrodes internally and the switching valves stick. This… Repairs typically run $800-$2,000. Severity: medium.

What is the 2003-2009 Lexus GX Center Differential Lock Actuator Failure?

The center differential lock actuator on the GX470 fails due to internal motor wear and electrical contact corrosion. When the actuator fails, the center diff lock cannot be engaged for low-range off-road use. The actuator is mounted on the transfer case and is exposed to road de… Repairs typically run $400-$1,000. Severity: medium.

Lexus · Known Issues

2005 Lexus GX Problems: 2 Known Issues

2005 model year · 3,100+ owner reports · Updated September 2026

Share:@au7o.io

According to Au7o's analysis of 3,100+ owner reports, the 2005 Lexus GX has 2 documented known issues. No issues are rated critical, indicating generally reliable ownership. The most commonly reported issue is Secondary Air Injection Pump Failure with 2,200 owner reports. Across all issues with published estimates, repair costs range from $400 to $2,000. DIY maintenance guides at au7o.io.

2005 Lexus GX Problems: 2 Known Issues

All 2 Known Issues

2003-2009 Lexus GX: Secondary Air Injection Pump Failure#

Common Symptoms

How to Fix

What you need to fix it

Owner tips & cautions

Research This Issue

2003-2009 Lexus GX: Center Differential Lock Actuator Failure#