How to fix Lexus / Toyota "AWD system malfunction 2WD mode engaged"
May be associated with other errors, such as "Check Engine" light, ICS / backup system warning, etc. Simple fixes that may save you time/money: 1. Check gas cap is tight. Yes, it's stupid - damn stupid, in fact. But it worked for me and others . Note the old RX330s had a similar issue, in that it would throw error codes if the gas cap was loose. Happened to me a few time when the weather got really cold. It's all because the car is looking for leaks in the emissions control system and sees that the pressure in the gas tank is not holding steady. 2. If codes do not clear themselves, disconnect battery for 5 min, then reconnect and start. • Open the door during that 5+ min, to ensure system is fully discharged. Not needed but can't hurt. • Yellow ICS light (top right-hand corner on RX350) will flash on restart. It will self-reset upon driving, don't worry about it. 3. Recharge battery to full, then retry. Worked for h...