2nd Gen Tundra: Check engine light, VSC and 4LO flashing, truck stuck in limp mode (P0418, P2440, P2442, P2445)

Checks, in order

1. Read the codes and the pattern
   P2440 and P2442 are the switching valves stuck open (bank 1 and 2); P2445 and P2447 are the pumps stuck off; P0418 and P0419 are the pump relay circuits. Valves stuck open with working pumps means you caught it early.
   easy $ · under about $50
2. Check for the software fix first
   On 2014–2016 trucks Toyota issued ECM reflashes for P2440/P2442 set by debris or ice in the valves (T-SB-0144-14 for the 5.7L, T-SB-0079-16 for the 4.6L). If your codes are only the valve codes, ask the dealer whether the reflash applies before buying hardware.
   easy $ · under about $50
3. Inspect the pumps and valves
   The pumps sit low on the passenger side; rust dust or water at the inlet means they are done. Replace valves and pumps together: a new pump feeding a stuck valve fails again. OEM pumps run $400–600 each and valves $250–400, so a dealer repair of the whole system is commonly $2,000–4,500.
   medium $$$ · shop-level job, $500+
4. Bypass modules
   Plug-in bypass kits ($150–450) turn the system off and clear the limp mode. They disable an emissions device, which is illegal for a road vehicle under federal law and fails inspection where the system is checked. Know your state's rules before you choose this route.
   medium $$ · about $50 to $500

Applies to: 2nd generation Tundra, 2007 to 2021, with the 5.7L 3UR-FE V8 (most trucks), the 4.6L 1UR-FE (2010–2019) and the 4.7L 2UZ-FE (2007–2009). Engine-specific items say which engine they apply to. Assumes a stock truck.

Tools and parts for these checks

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The same problem on other Toyotas

• 2nd Gen Sequoia (2008–2022): Check engine light with VSC and 4LO flashing, limp mode, codes P0418, P2440, P2442, P2445

Other emissions problems on the 2nd Gen Tundra

• Check engine light with P0031, P0051, P0135 or P0141 (air-fuel or oxygen sensor heater)

More 2nd Gen Tundra problems

• Burning oil smell or smoke from the engine bay after a drive, no puddle on the ground (5.7L) (Engine)
• Ticking from the engine on cold start that fades as it warms up (Engine)
• Pink crust or a drip at the front of the engine, coolant level dropping (Cooling)
• Turn the key: one click or nothing, engine does not crank (Starting & Charging)
• Brake booster motor buzzing, sinking or hard pedal, ABS/VSC/TRAC lights (Brakes)
• Gear oil on the inside of a rear wheel or on the brake backing plate (Drivetrain)

All 10 2nd Gen Tundra 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.