Blinking 4LO plus check engine

Hello

Out of the blue a couple of days ago the 4LO light started flashing, and the check engine light is on solid in my 2020 Sequoia.

2WD and 4WD seems to work fine. I can't switch to 4LO. The last time I used 4LO was probably june, august at the latest.

There are many codes that TechStream reads:

• P043E
• P043F
• P1603
• P1604
• P1605
• P2401
• P2402
• P2419
• C1241
• C1439
• B150A
• U1117

A bit overwhelming. But given that the truck drives fine (except no 4LO): I wonder is it just some stupid useless sensor broken?

The only thing that's changed recently is I started parking outside, and in the few days the temperatures dropped below freezing.

Any ideas? I'm taking it to the stelership tomorrow, but I worry my warranty has expired by now.

Thanks in advance.

 

Any chance rodents got to your wiring? That’d be my bet. If not, could be a dying battery.

 

I shudder to think of that. If that's what happened: do entire harnesses need to be replaced? Can that be done without taking the truck apart?

 

Look for signs of rodents under the hood and in the cabin filter inside the glovebox. Sometimes the damage can be repaired/spliced back together. A dealership will probably push a new harness.

Does the starter turn the engine strong when firing up?

 

Yeah, not even a hint of hesitation.