Checks, in order
- Run the VINCheck nhtsa.gov/recalls or a Lexus dealer for 20V682. The fix is a new pump assembly at no cost. A separate class action settlement (23LE01) covers some related fuel pump complaints.easy $ · under about $50
- Battery and connections firstA GX that cranks slowly or clicks has a battery problem, not a fuel problem. Resting voltage should be 12.4 V or more, and the terminals clean and tight.easy $ · under about $50
- Fuel pressure and codesRead the codes with a scanner and check for fuel pressure at the rail. A weak pump sets lean or misfire codes under load before it fails outright.medium $$ · about $50 to $500
- Spark and ignitionA misfire on one cylinder is a coil or plug; swap the coil to a neighbor and see if the code follows. Oil in the plug wells (see the oil leak symptom) shorts coils.medium $ · under about $50
Applies to: Lexus GX 460, 2010 to 2023, with the 1UR-FE 4.6L V8 and the A760F 6-speed automatic. Air suspension items apply to Premium (2010–2013) and Luxury (2014+) trims with rear air springs; KDSS was standard on most US trucks. Secondary air injection items apply to 2010–2013.
Tools and parts for these checks
Links below are Amazon affiliate links: as an Amazon Associate, toyotadata earns from qualifying purchases, at no extra cost to you. Confirm fitment for your exact truck before you order.
| ITEM | USED FOR | BUY |
|---|---|---|
| Bluetooth OBD2 scanner with live data | Reading and clearing codes and watching live sensor data | Shop on Amazon |
| Fuel pressure test gauge kit | Confirming the pump is delivering pressure | Shop on Amazon |
| Inline spark tester | Confirming there is spark at the plugs | Shop on Amazon |
More Lexus GX 460 problems
- Check engine light with flashing 4LO and TRAC OFF, won't shift past 3rd or 4th when cold (P2714) (Transmission)
- Check engine light with 4LO and TRAC OFF flashing, codes P0418, P2440, P2442, P2445 (2010–2013) (Emissions)
- Truck sits lower on one side, leans right, or KDSS feels stiff after a lift (Steering & Suspension)
- Rear end sags, rides soft or bottoms out, compressor runs a lot, or a Check Air Suspension message (Steering & Suspension)
- Pink crust around the front of the engine, coolant smell, or slow coolant loss with no puddle (Cooling)
- Oil on the front of the engine, oil in the spark plug wells, or burning oil smell after a drive (Engine)
All 8 Lexus GX 460 symptoms in the interactive troubleshooter →
General guidance from owner experience. Confirm torque specs, fluid capacities and procedures in the factory service manual. Brakes, steering and anything structural: if in doubt, have a qualified shop inspect it before driving.