2025 Tundra Failure at 10k miles

Started by aengh · March 6, 2026 at 8:41 AM ET
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aengh
OP
March 6, 2026 at 8:41 AM ET
#1

We have a 2025 Tundra Limited (not hybrid) currently at the dealer with serious issues. This is the current situation and we still in the process of dealing with the problem(s). I will try to keep my opinion out of this post in order to present a less biased picture about the situation/puzzle. There have been no previous issues with this truck. Time line is as follows (bear with me--all of this could be important):

This vehicle was refueled from nearly empty (probably 3-5 gal fuel left) Feb 13 at a reputable gas station--not a cut rate indy. No reports from community of quality issues,

This was then driven ~100 miles, sat overnight and driven to the dealer ~30 miles away for the recommended oil change. All is well.

A couple of brief in town stops in town were made and then it was driven back ~30 miles where it sat overnight.

On Feb 15 it was driven ~100 miles and put in the garage. By this time, the tank was about 1/2 empty.

Truck sat in a closed garage until Feb 20 (5 days). Not driven. We were intending to drive 100 miles. It ran perfectly for 19 miles and abruptly quit. No warning, no prior check engines, nothing. Would not restart. Cranked but there seemed to be no fuel. There was a check engine light now. Towing driver said that he could hear the fuel pump kick on but it only ran for a few seconds--not the full time while the engine was cranking. His code reader would not read the code. Hauled to dealer.

Dealer looked at it Feb 21. Mechanic was puzzled and probably spent 2-4 hours going over it. The service advisor at this time told me that the gas was good. They needed to wait until monday to look into this further. They indicated the codes did not make sense--what ever they were IDK.

Over the next week they (I am getting hard copies of all of the service records):

  1. On Monday Feb 23--"Issue: FOUND VEHICLE IS GETTING FUEL, SPARK, AIR AND HAS COMPRESSION. Correction: DRAIN FUEL TANK + ADD 5 GALLONS OF GAS" They told me the gas was bad vs. good on saturday. Didn't work. Then they told me the gas they put in the tank tested bad. It was their gas.
  2. Next interaction that week: "Issue: FOUND SPARK PLUG ARE FOULED OUT. Correction: SPARK PLUG (ALL) + 5 GALLONS OF GAS"
  3. Next interaction: "Issue: INSTALLED NEW PLUGS ADDED FUEL VEHICLE STARTED AND RAN FOR A MINUTE BUT DIED AND WON'T START TOOK FUEL SAMPLE. FUEL TESTED BAD Correction: REC TO REMOVE GAS TANK DRAIN CLAN AND INSPECT" . Didn't work. Assuming they found nothing.
  4. Now we are at week of Mar 2. "Issue: NEED TO REPLACE 6 DIRECT INJECTORS AND 6 PORT Correction: 6 port injectors 6 direct injectors gaskets and seal for injectors and gaskets for upper and lower intake"

HELP! What is going on here. They keep telling us that the fuel is bad. REALLY? I do have an opinion but want to hear from you all!

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TheCarGuy
TheCarGuy
March 7, 2026 at 2:13 AM ET (edited Mar 7 ET)
#2

If the fuel was truly bad, draining the tank and adding fresh gas should have fixed the problem immediately. Modern engines may run rough with contaminated fuel, but they usually don’t require all 12 injectors and a full set of plugs after only 200 miles. That level of failure would normally require something extreme like diesel in the tank or heavy water contamination, and even then the dealer would usually show you the fuel sample.

The Tundra ran about 200 miles after the fill up and then another 19 miles on the day it failed. Bad fuel problems typically show up quickly after refueling, not after multiple drive cycles and days later.

The original note saying the truck had fuel, spark, air, and compression is odd. That usually means the issue is either:

Fuel delivery pressure or control problem... Something like the high pressure fuel pump, rail pressure sensor, or ECU issue. The V35A uses port and direct injection, so if the ECU thinks pressure is wrong maybe it's shutting things down.

ECU protection strategy If the computer sees something it doesn’t like with fuel pressure, misfire events, injector circuit issue, it can disable injection, which could be why it cranks but won’t run.

Electrical or harness issue Replacing all 12 injectors makes me wonder if they saw multiple injector circuit codes. That could also be caused by a shared wiring harness or ECU driver problem not the injectors themselves.

Replacing all 12 injectors is unusual unless they actually tested contaminated fuel that damaged them, or they’re throwing parts at it because they don’t have a clear root cause.

Also odd, they first said your fuel was bad, then said their shop fuel tested bad. That sounds like their test procedure may not be reliable.

If this were my truck I would ask the dealer for The actual diagnostic trouble codes that were stored, the fuel contamination test results, whether fuel rail pressure was within spec during cranking, and why they concluded all 12 injectors needed replacement

Right now, “bad gas” doesn’t fully line up to me.

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Started by aengh · March 6, 2026 at 8:41 AM ET