Lexus GX 460: Check engine light with 4LO and TRAC OFF flashing, codes P0418, P2440, P2442, P2445 (2010–2013)

Checks, in order

1. Confirm the codes and the model year
   P0418 is the pump circuit; P2440–P2447 are the switching valves stuck open or closed on bank 1 or bank 2. On a 2014 or newer truck, these codes point elsewhere (wiring, a failed valve) rather than the filter debris problem.
   easy $ · under about $50
2. Check for campaign coverage
   Call a Lexus dealer with your VIN and ask whether Special Service Campaign JLG (2019) or any warranty enhancement is open. Lexus bulletin L-SB-0028-14 Rev1 covers 2010–2013 GX 460 and calls for the pump (17610-0C040) and/or switching valves (25701-38100 bank 1, 25702-38050 bank 2) with about 2.3 hours of labor. The emissions warranty is 4 years/50,000 miles federally and 7/70 in CARB states.
   easy $ · under about $50
3. Inspect the pump filter and valves
   Pull the pump intake and look at the foam filter; crumbling foam confirms the cause. Debris in the switching valves jams them open, which is what sets the P244x codes. Out of warranty, owners report dealer repairs in the $2,000–2,500 range for pump and both valves.
   medium $$$ · shop-level job, $500+
4. Bypass kits
   Aftermarket bypass modules that fool the ECU are a common owner workaround on Toyota V8s. They remove an emissions device, which is illegal for a road vehicle under federal law and will fail a visual or OBD inspection where those are done. If you go that way, understand what you are giving up before you unplug anything.
   medium $$ · about $50 to $500

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

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The same problem on other Toyotas

• 100 Series Land Cruiser / Lexus LX 470 (1998–2007): Check engine light with secondary air injection codes (P2440, P2442, P2445, P0418), whirring at cold start

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)
• 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)
• Steering wheel flutter or vibration at 55–70 mph that balancing did not fix (Steering & Suspension)

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.