2018 Tacoma 4x4 multiple warning lights in morning

Never happened before. It was cold this morning though. Side monitor error, abs brake error, etc. My signal other drove to work. Went out during lunch when it warmed up and no errors.

Truck has 2500 miles on it. Is this normal???

 

Maybe leave it at the dealership overnight and have them check it in the morning when cold.
Definitely not "normal".

 

Not normal.

The fact that it returned to normal eliminates fuse which would have been first look.
Could still be exposed wiring causing short, but less likely.
Next highest probability is bad/faulty sensor, but I cant determine from your post which exact systems were malfunctioning. Was it side mirror flash like blind spot monitoring? ABS error? Was it just the light, no rubbing or thumping sound? No check engine light?

 

Yes side mirror blind spot error, abs brake error, not sure if anything else. I have a a very good code puller, would it tell me anything? Are those systems connected somehow???

 

No check engine light, just triangle. No thump.... or driving issues.

 

The only issue I see when cold is park sensors beeping because of ice/snow on the vehicle.

 

I don't think the systems are connected to the ECU, but new to this truck.

Exhaust system, can cause ABS fault, that clears up quickly, but would be likely accompanied by check engine light, and does not explain mirror.

Brake pedal sensor would have been my guess as it could affect ABS, and rear bumper sensors for Blind side monitoring/ cross traffic alert.

 

Fantom electrical problems when extremely cold, are hard to diagnose, the answer is going to be found as "HAVOC" suggested, while its doing it, everyone hates going back to the dealer, but look at the alternative, If you have ever gone out to a new car in the morning, turned the key...... and " no crank to Start" this will add a whole new dimension to your anger, disappointment, and trust .
Good LUCK

 

Soooooo... anyway to narrow it down???

 

Not really. The best thing to do is replicate the conditions and have the techs see what codes are present and possible causes. There may or may not be service bulletins dealing with this. Maybe water is getting into somewhere and when it freezes, the problem arises.

The first thing they'll ask is if anything aftermarket has been installed on the vehicle.

 

These types of issues often have low voltage as a cause. With everything on the truck being electricly controlled by modules if the supply voltage drops low enough for the module to quit commuicating on the network then everything controlled by that module will activate caution lights and messages.

So the first step is to determine if the items that generated errors are all controlled from the same module. You could also check your voltage drop during start if you have a meter with a min/max function.

That's my guess based on it happening when it was very cold. But of course spitballing with a tiny bit of information may not be very useful.

 

David, have you ever told a dealer how to troubleshoot a problem? Good luck with that! I agree with your diagnosis, but my guess is dealer will find nothing.
Sorry OP -- but this is just my guess - I may be wrong if you have a outstanding service dept. one that cares.

 

My dealer has been surprisingly decent when it comes to the ECU/TCM flashes. I tell them I have the problem described and they do the update without test drives or nonsense about not being able to duplicate.

With anything else I agree with you. It doesn’t help to give any suggestions mainly because nobody is incentivized to find anything. The flat rate tech gets .3 hours or something ridiculous to do the diagnosis. If he actually takes an hour or two to find a problem, he worked for free and he will likely catch hell from the service manager because warranty repairs pay about half of the normal book time so there is tremendous opportunity cost to doing warranty work well.

The entire concept of flat rate has virtually destroyed the auto repair industry for anything besides an obvious broken component or a pattern based failure that is so common the shop sees one a week. It’s a great study (like so many entrenched systems) of unintended consequences.

 

17 different computers talking in the cold. It's bound to happen. I stop my truck for etune issues about every 2 months.

Cont-Alt-Del is your friend. It sucks...first world probs.

 

Had sort of a similar situation this morning. Truck has less than 900 miles on it, and I got a CEL when I started it this morning. Gas cap was on tight, and I'd already used half a tank since last fill up anyway. It was colder than usual, but hardly frigid. Cruise control doesn't work either, but maybe that automatically shuts off with a CEL.

 

Sounds like it may be a recurring issue with the third gens. Were any service bulletins released?

 

Last week it got below freezing here in North Texas. Not terribly cold relatively speaking. However for two mornings my radar was unavailable (for cruise and collision) for a few minutes. Seemingly, as the truck drove/warmed up the warning light went off and everything was back to normal. There may have been ice on the sensor. It is supposed to get cold again this weekend, and I plan on checking to see if the problem shows up again.
I didn't get any other trouble indicators, and the truck drove fine. My truck has 10k on the odo and is a 2018 that I bought at the end of July.