Symptoms
On cold starts, especially below about 50°F, the truck won't shift 3–4 within the first 5–15 minutes. It sets P2714 and P0761 and turns on the check engine, VSC and 4LO lights.
The fix, step by step
- IH8MUD's summary thread lists the usual escalation.
- Start with an ATF drain and fill, clean the MAF and throttle body, and clean and reseat the related connectors.
- Then replace both transmission speed sensors, then the solenoids.
- Some owners manually shift the first 15 minutes (upshifting around 2,200–2,600 rpm) as a workaround.
- Recent posts report success with a seal-conditioning ATF additive.
- Once reverse or 3–4 won't engage at all, the transmission is likely done.
Tools & part numbers
- Scan tool
- ATF and fill tools
- MAF and throttle-body cleaner
- speed sensors 89413-0C011
Where to buy the parts
ATF WS, 2015 GX 460RockAuto ↗Amazon ↗
Speed sensors, 2015 GX 460 (match input/output position)RockAuto ↗Amazon ↗
Shift solenoids, 2015 GX 460RockAuto ↗Amazon ↗
Transmission pan gasket, 2015 GX 460RockAuto ↗Amazon ↗
Hunting a used or discontinued part? Search eBay Motors for Lexus GX 460 parts →
Rated for a competent home mechanic with a decent tool kit. Confirm torque figures, fluids and procedures against the factory service manual for your VIN, support the truck on stands rather than a jack, and work at your own risk (disclaimer). Some parts links are affiliate links, which pay us a small commission at no cost to you.