"Reduced Engine Power - Visit Your Dealer" message

I have a 2023 iForce Max with ~10k miles on it, a couple of days ago I was cruising on the freeway under normal conditions and a message showed up "Reduced Engine Power - Visit Your Dealer". The truck itself still felt perfectly fine and I couldn't feel any difference. Took it to the dealer, came back with code P02351C related to the turbos. They reset the code, did a road test, input a DTC code, everything came back with system normal. Has anyone else experienced anything similar? I'm still worried as to what triggered the code.

 

Did they give you an invoice? It's always good to keep a paper trail of these issues. The reason is that if the problem returns later, after warranty expires, you have a proof that the problem started while the car was still under warranty and claim that it should be repaired at no cost. Most manufacturers will honor warranty as long as the problem was reported earlier (within a reasonable timeframe).

 

They did luckily, definitely saving it

 

I have a 23 Sequoia. At 11,000 miles message "Reduced Engine Power- Visit your dealer." Restarted vehicle and light went out, ran normally- never noticed any change. Dealer found the same code P02351c. They found "pressure reading with vacuum applied is out of spec"- contacted Toyota and were told to replace the Turbo.

 

Is that a gas cap code?

 

have you been running heavy ethanol based fuels or 87 octane only?

 

In my Sequoia, I only used regular unleaded.

 

Depending on where you buy gas or live can depend upon how much ethanol is in the fuel. Most that say 10-15 percent are more like 20-30 percent in actuality. I am not telling you or anyone what to run, but I have always at least run a mid-grade but most times premium fuel without ethanol. Try to find those type dealers since these new turbo vehicles say they will run on regular unleaded they tend to not like the fuel very much.

 

Thanks for the advice! I live in Michigan, typically just fill up at Walmart or local stations.I will definitely look at upgrading the fuel. I love my Sequoia ( coming from a 2018 4runner) and want it to last a long time!

 

not to change the topic of this thread, but i was very skeptical of running anything other than regular. Ive ran through 2 tanks of premium and the difference is small but noticeable. Much better idling, smoother acceleration (may be placebo effect tbh), and my mpg kicked up about 1-1.5 mpgs. Obviously long term effects remain to be seen, but short term ive seen enough to make me spend the little extra.

 

The jist is higher octane grades have better resistance to the fuel combusting when it's not supposed to (Detonation.) That's why it's recommended on many turbo or high compression engines. Even though the Tundra says 87 octane minimum, I've always used ~92 (Or even clear non-e) on anything I've owned turbocharged. Whereas I use 87 in our 2019 Highlander.

 

Yeah ethanol causes all kind of egr issues and will kill an OEM cat around 100 thousand miles. I get that is more expensive to run but it is the ethanol that tends to kill engine longevity and usually results in clogged cats, fouled plugs, and clogged injectors over continued usage. You can fill up with regular and run a tank or so of premium through a month and that helps clean off the excess carbon build up.

 

Could that be part of the problem? Even though Toyota says 87 is okay, maybe it's not and causing some of these issues?

 

To each his own, but for me, it just makes sense to run a high octane gas in a turbocharged vehicle, even if it doesn't specifically require it. Higher octanes are more stable and have better resistance to detonation. To clarify, though, octane rating and ethanol content are two separate things. All 3 standard grades (87, 89, ~91+) will have ethanol in them. The fourth option would be clear gas or non-ethanol. It is high octane without ethanol, but is generally quite a bit more expensive comparatively if you even have it available near you. (A couple stations near me have it at roughly $1-$1.50 a gallon over the normal 92 octane premium.) It does provide slightly better fuel economy than those with ethanol. Keep in mind, though, vehicles are designed to work fine with 10-15% ethanol. It's more detrimental to small engines like generators, where it gums up the carburetors if you leave it in there for any period of time.

 

Had several BMWs with turbos. Always ran premium. Figured I would at least run mid-grade in the Tundra.

 

I always fill at half or 3/4 tank. I alternate premium and regular.

 

I've burned nothing but 92+ since new. Like others have said, I feel better with higher octane on a TT engine. Just personal preference.

 

I have 87, 89 and 91 near me. Also have Non-ethanol 87

91 or nonethanol 87? (Might even be 89)

 

91, IMO. Only do non-e if its high octane. Higher octane is less likely to cause knocking. It seems weird to me that 87 is even deemed ok with this engine.

 

All our pumps say "No more than 10% ethanol." If someone were to test the fuel and find more than 10%, I'm sure there would be a lawsuit.

 

Are you sre about that? Go test it and find out. I can't say yes or no but there are videos out there that test your theory.

 

I believe non-ethanol versus the corn juice blend is more important than octane rating. If you've ever torn apart a carburetor (yeah I'm showing my age) that has been running on corn juice, you'd know why. That crap creates a gooey mess on anything it flows thru, especially if it sits for a while. I always try to find stations with non-ethanol.

 

Then
1) why hasn't it made the news
2) why haven't state regulating agencies been contacted
3) why aren't the stations and refineries being sued into oblivion?

I can grab one of my jerrycans, pour some gasoline into a graduated cylinder, and say to my YouTube audience, "look, more than 10% of this is ethanol!" Did I actually test anything, or do anything about it?

 

After 15 years and 325k with diesels dual turbos as my primary driver, these rigs have a ton of sensors and warning conditions. Reduced engine power is the check engine light of yester year. The vehicle is not happy and it could be something trivial or total FUBAR.

 

The Toyota Forklift diesels are electronically controlled and not serviceable. New ones are Garrett Turbos @ $5k. So anything is possible as far as a glitch hope the op has smooth sailing. @Eurodriver could work the bugs out?

 

I've heard the Mexican tuneup works wonders, even for break-in.