2025 Lexus GX 550 service and repair manual — a detailed, factory-style reference for maintenance, diagnostics, and repair. Use it to confirm correct procedures, specifications, and system coverage before you start work.
Designed for technicians and DIY owners, this manual helps you diagnose issues correctly, follow proven repair steps, and use wiring diagrams and system sections to track faults faster.
What’s included
- Step-by-step repair procedures and service information
- Specifications, torque values, and reference data
- Electrical diagnostics with full wiring diagrams
- Coverage across major systems: engine, transmission/driveline, brakes, steering, suspension, HVAC, and more
- Diagnostic trouble codes and troubleshooting flow
- Maintenance schedules and fluid capacities
Trims covered
- Luxury
- Luxury+
- Overtrail
- Overtrail+
- Premium
- Premium+
Index / Table of contents
- Body
- Brakes
- Chassis Electrical
- Driveline
- Engine Cooling
- Engine Electrical
- Engine Mechanical
- Engine Performance & Emission Controls
- Fuel System
- General Information & Identification
- Heating, Ventilation, & Air Conditioning
- Maintenance & Lubrication
- Specifications
- Steering
- Suspension
- Transmission, Clutch, & Transfer Case
- Diagnostic Trouble Codes
- Technical Service Bulletins
- Wiring Diagrams
My less than a year old Lexus GX550 was sitting in the driveway and the sunroof exploded. The car was not moving and it exploded outwards into a ton of pieces. The dealership claims that it is not a warrantable part. No foreign object hit the sunroof, even then it shouldn't shatter, only crack. It is my assumption that defective glass from the factory was installed into my vehicle and caused the sunroof to shatter for no apparent reason.
Car’s brake fluid leaked out of the brake lines into the master cylinder or brake booster resulting in significant loss of brake fluid to the system and a hazardous driving condition.
The contact owns a 2025 Lexus GX 550. The contact stated that while driving at various speeds, the hood of the vehicle was fluttering up and down. The vehicle was taken to the dealer; however, the vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was 4,865.
The contact owns a 2025 Lexus GX 550. The contact stated that while driving at various speeds, the hood of the vehicle was fluttering up and down. The failure was more noticeable while driving 55 MPH or faster. The vehicle was taken to the dealer, who determined that the issue was normal and was known to occur with other 2025 models. The vehicle was not repaired. The manufacturer was informed of the failure, and a case was opened. The failure mileage was approximately 5.
Vehicle experiences a persistent and abrupt harsh downshift (jerk/thud) specifically during 2nd-to-1st gear transitions when rolling to a stop. This issue persists despite the dealership performing the recommended Transmission Control Module (TCM) software update at 5,000 miles. The smooth shifting returned briefly for approximately 500 miles post-update before the abruptness returned. Additionally, there is a noticeable vibration/harmonic change in the engine as the oil reaches approximately 3,000 miles of use. Concerned that this transmission behavior is a secondary symptom of internal engin
The car has harsh knocking downshifting. In slow speeds, the has abrupt transmission changes.
On 10/7/25, the passenger side front tire malfunctioned - I currently have the tire. On 9/7/25, the drivers side rear tire malfunctioned - I no longer have that tire but I have included the receipt for the new tire I had to purchase. On 9/7/25, I was driving alone on the Florida Turnpike at night and in the rain, when the rear drivers side tire blew and was completely destroyed with multiple holes in the sidewall. Fortunately I was able to maintain control of the car, but I was stuck on the side of the highway until a Florida Road Ranger came to assist. The problem was reproduced on the mor
The driver side mirror shakes around 45 to 50 miles an hour plus. The passenger side mirror at the same speeds stays true and does not vibrate. While I am driving mostly on the highway the driver side mirror shakes or bounces up and down which distorts the images behind me. It is a safety concern where I am getting dizzy while driving. I brought the car back to the dealership Lexus of Pembroke Pines, and they replaced the entire mirror assembly, but it is having the same problem again. The car is not even two weeks old. The constant vibration is a legitimate safety concern and prevents me from
Showing the 8 most serious of 11 complaints filed with NHTSA.
