Help, Check Engine, Reduced Engine Power

2024 Limited, 2 months old with 5200 miles.

We were driving back from Denver CO to Mesa AZ today. 850 miles 12 hours straight drive.
About 30 miles from Mesa on the Bee Line Highway, we were pulling a grade and it felt like I had hit a washboard section of the road then I realized the truck was shuttering badly. I backed off into the slow lane and immediately got the check engine, reduced engine power, parking support brake malfunction, and the truck slowed down struggling to pull the grade. Put the flashers on and crawled the rest of the way home. Called the dealer from the road, it is Saturday at 5:00 so no help. Made an appointment for 7:00 AM Monday. The truck barely backed up the incline into the garage. It was missing and shuttering badly. Left the truck off 10 minutes and it cranked fine. I drove it around the block without issues other than the service warning light. What the heck gives? I am very glad we were not towing the Airstream when it failed. There was nowhere to pull off. Needless to say, this is incredibly disappointing.

Similar experiences out there? Potential cause and fix?

 

I want to say someone had this and it was a bad coil

 

Also had it happen and I just reset the check engine with my scanner and it went back to Normal. I took it to big two Toyota since that’s the closet to me in San tan. And they didn’t see anything wrong with it. Let me know if you find out what it is.

 

You hit a nasty section of xway?

I'm betting a wheel speed sensor took itself off line.

Until you can verify what codes were thrown, we most likely will never know.

 

Thanks! How long are the fault codes present in memory? Ok to drive it tomorrow without losing the fault codes? Had it been my GMC a quick OnStar call with remote diagnostics would have provided a cursory indication of the code faults. Very nice feature.

 

If your CEL has gone off, then the codes have been cleared that prevent drivability.

If there are " pending" codes, they will remain in the background.

What code triggered the limp mode will be retained for quite some time.

 

I am pretty upset at this point. The dealer calls and says that yes it had a code. They drove it and could not reproduce the issue. He started to tell me to come and get it and I cut him off politely stating that I would not pick up the truck until the full diagnostics had been sent to Toyota, that Toyota diagnosed the root cause and replaced parts. He would not give me codes over the phone so I drove back to the dealer and asked for the diagnostic report. He said it was not something they normally give out. I insisted. He had to go to the manager who said it was ok to give me the report.

Powertrain Systems, Action Required, P030100
Chassis Systems, Action Required, C14FE14
Electrical Systems, Action Required, B00D514, B00D214, B15C513
Network Systems, Action Required, U010187, U015587, U114F87, U014087, U014087,U015587, U012687, Y114F87, U014087, U11D387, U014087, U014087, C015587
Service Campaigns, No Action Required, 24TA042 Performed

That is the full report. Any feedback, explanations, and/or information would be greatly appreciated.

Not sure where I go from here if they just force me to take the truck back without diagnosing and fixing the root cause(s).

 

Wow, that's a lot of codes.

 

Call Toyota Corp to explain them that your new two month old truck died on you while on highway and you ask them to perform thorough diagnostics and tell you what causes this issue.

 

@koditten is probably on the right path!

Sounds like a sensor or connection with all the varying codes and then the reset when restarted.

So with the codes, Toyota should be able to cross these codes and come up with a common link.

I had something similar with my Honda. A mouse chewed my rear abs sensor wire. Everything went crazy and lit up like a Christmas tree. These systems all interact to some degree. The Limp mode should help pinpoint what happened.

On a different note: I would think that the silver truck and Airstream make a great looking set.

Post some pics when you get things straightened out.

 

Powertrain code P0301 = number 1 cylinder misfire. Them not giving you the list of diagnostic fault codes is a line of bullshit. Often times when a powertrain fault code is set, other systems will set codes basically stating there is a problem with the the powertrain or communication with the powertrain.

 

Now on modern engine management systems if a misfire is detected for a period of time, the system will shut off the injector to the affected cylinder until ignition switch is cycled mainly to prevent catalytic converter damage from raw fuel being fed into it.

 

Most common causes of misfire; faulty spark plug or ignition coil, less common; fuel injector issues, etc. An internal mechanical issue (compression) most likely will NOT come and go, especially if it runs fine now. Should not be a major deal to diagnose if a competent tech is working on it.

 

Fuel??? small quantity of water in fuel could cause a similar situation???

 

All these codes is CAN-bus malfunction. Some module crapped out and broke all the communications on that shared bus.

 

True, but shouldn't cause a misfire.... P0301...

 

Easy. Ignition is electrically controlled by ECM running software.

 

This is a root cause of half the car going offline, transmission dropping into limp mode and engine reducing power to walk-behind lawn mover levels. No, my hand is not the root cause. You can actually see a tiny SMD resistor that belongs to the CAN-bus termination in differential computer mounted on the bottom of the car, where it faces moisture, salt and heat all the time. The aluminum body of the computer corroded along the seal, water got in and ate a contact pad of this resistor, between the PCB and resistor, hidden from eyes and multimeter. That caused signal reflections in the dedicated CAN-bus running between brake and differential controllers - not affecting any other computers directly! The software in the brake computer crapped out, because the company making those - ATE, a well respected one, mind you - didn't test this scenario and didn't have a proper error handling routine in place. Brake computer crapped out in the middle of transfer on another CAN-bus, now shared with other modules. They lost communication with other modules, every single one registered an appropriate error. Luckily this scenario was covered in the engine and transmission computers software, so I was able to accelerate 0-10 MPH in like two days and make it home, where it took me a few days of PhD-grade investigation in order to locate the problem.

This happened in a 20 years old car. Gen2 Tundra/Sequoia is about the same tech level. Gen3 is much more complicated. Meaning, there's lot more shit controlled by software and lot more untested shit potentially happening with it.

 

Yes, but a single cylinder misfire is still a place to start. ECM is still a pretty much stand alone entity as far as cylinder to cylinder operation. Systems such as brake control system can "request" reduced power in a traction control or skid event.

Getting back to OP's issue, sounds like for what ever reason there was a misfire issue on #1 cylinder enough for it to go into catalyst protection mode. Dealer subsequently read codes (which they originally refused to disclose), then drove around the block, wouldn't act up so "no problem found" and basically blew him off... Flat rate technician not going to get paid to dig deeper so on to bigger and better jobs.

 

The dealer had the truck again all day and not a word. So the question is, are they working on diagnosing and fixing the root cause or are they going to gaslight me tomorrow with the "we worked hard to diagnose this issue but could find nothing wrong" come pick it up?

 

The dealer called this morning and told me that they continue driving the truck daily to replicate the previous reduced engine power failure and fault codes. I asked why the previous diagnostics did not tell them what the issue was.

I was told that they must be driving the truck when the reduced power event occurs to determine the exact fault. I asked why Toyota could not look at the current logs and was told it does not tell them anything unless they are monitoring it when it fails. I can't believe that Toyota corporate cannot look at the detailed logs from memory and determine the cause of the fault.

Is there no way to diagnose the fault unless they are driving it with the analyzer connected when the fault occurs? I can't believe this!

If it is true is there an after-market analyzer that I can leave plugged in and read the codes before turning it off? Will there be any more detailed information provided beyond the codes already provided? Is there ECU memory dump function?

Maybe Toyota should provide an analyzer with each new Tundra if this is the case.

This just makes me so mad. 65k investment to pull my new Airstream and there is now absolutely no confidence in doing so. Towing frequently throughout the CO high country passes it would be incredibly dangerous to have the truck suddenly shut down.

 

Maybe it was just a fluke and you need to calm down??

 

I dunno.

He got $65k paperweight. He can be as pissed as he wants.

 

But it works?

 

I recommend getting a scangauge 2 or scangauge 3, or similar product. This way you can read and clear the codes on your own in real time as well as perform many other functions with it. I understand the frustration, especially given the use of the truck to haul a camper long distances. It’s not that it broke, was fixed, and the story is over. The issue is you don’t know what the problem was, and nothing was truly done to address it so what is to prevent it from happening again at a less than opportune time.

 

That's why I said the whole issue could be a fluke and can't be replicated....with all the electronics on these things.....ever had to reboot a computer? I think the bad gas theory sounds plausible? Maybe had a bit of water in it?

 

Who knows, but if he gets a scangauge he can at least read the codes right away and if need be clear them if it goes into limp mode. My computer may need a reboot from time to time, but it also doesn’t carry me down a steep mountain grade with 7k of trailer behind me so I get the apprehension.

 

Thank you Silver17! Appreciate the suggestions. I will look into getting one. They have had the truck for a full week now and not a word. This is quite frustrating.

 

I just spoke with the service advisor (Saturday 3/2). I told him I would like to get the truck back. He said to wait until Monday as the service manager wanted to figure out what was wrong with mine and another new one doing the same thing. I told him to hook a heavy trailer on the truck(s) and drive from Mesa to Payson (several long steep grades) and back if he wanted it to fail. It is what I will do when I get back to Denver.

Silver17, I ordered the ScanGauge III. Should be here in plenty of time for my drive back to Denver. I liked that I could set it up as a full set of gauges.