Jump to content

2020 Tahoe Help - Limp Mode

DOUG75
 Share

Recommended Posts

DOUG75 Enthusiast

DOUG75

Posted
Posted (edited)

I haven't had any good luck for a while now. The wife went to town last night; about a 1 mile away and almost didn't make it back.

A 2020 Tahoe with 12,000 miles went into limp-mode at the bottom of the driveway, again, a short trip and the engine wasn't even hot.

Checked the oil, right where it should be, and it was changed a few months ago.

A few weeks ago we were at a dealer and said that we thought the transmission might be doing something strange and they test drove it with ultra soft care (like it hade a 20hp engine).

We don't tow, race around, etc., and no other drivers except the two of us. This seems very usual, we had a 2015 Tahoe with the same engine/trans and never had a issue.

Well anyway, we are stuck now, miserable timing with the holiday weekend.  

Tried to restart it today, no change.  The engine revs a bit, although sounds like 1/2 the spark plug wires are missing. 

 

On top of this, the dealer is 15 miles away and the route is on a 70mph highway, I can't drive it there!! 

 

Any quick fixes, things to check?

 

 

2020 Owned 1 year  

Engine 5.3 

Trans 6 speed

Engine light is on

 

* Glad she didn't break down somewhere else! 

Edited by DOUG75
details
Jac365 Enthusiast

Jac365

Posted
Posted

Trouble codes??? If it sounds like "half the plug wires are missing" meaning skipping, rough running etc. sounds like it may have dropped a lifter or two. Several threads here pertain to this issue. More information needed though.

JimCost2014 Senior Enthusiast

JimCost2014

Posted
Posted
7 hours ago, DOUG75 said:

I haven't had any good luck for a while now. The wife went to town last night; about a 1 mile away and almost didn't make it back.

A 2020 Tahoe with 12,000 miles went into limp-mode at the bottom of the driveway, again, a short trip and the engine wasn't even hot.

Checked the oil, right where it should be, and it was changed a few months ago.

A few weeks ago we were at a dealer and said that we thought the transmission might be doing something strange and they test drove it with ultra soft care (like it hade a 20hp engine).

We don't tow, race around, etc., and no other drivers except the two of us. This seems very usual, we had a 2015 Tahoe with the same engine/trans and never had a issue.

Well anyway, we are stuck now, miserable timing with the holiday weekend.  

Tried to restart it today, no change.  The engine revs a bit, although sounds like 1/2 the spark plug wires are missing. 

 

On top of this, the dealer is 15 miles away and the route is on a 70mph highway, I can't drive it there!! 

 

Any quick fixes, things to check?

 

 

2020 Owned 1 year  

Engine 5.3 

Trans 6 speed

Engine light is on

 

* Glad she didn't break down somewhere else! 

First thing, since it is still under warranty, don't drive it, call roadside assistance and have them come and put it on a flatbed, it is a free service.

Then let the dealership figure out what is wrong, another part of the bumper to bumper warranty.

DOUG75 Enthusiast

DOUG75

Posted
  • Author
Posted

Thanks, we will be contacting them first thing Tuesday morning!!

Don't think it's a head/valve problem, tried staring it a few times, the engine sounds good for about 30 seconds then goes back into Limp-Mode.

I'll let you all know what happens next.

 

 

 

DOUG75 Enthusiast

DOUG75

Posted
  • Author
Posted

So as not leave this open, we did get the Tahoe back the next day. A wire shorted out on the inside the wire harness and the fuse blew.  They said the right side of the engine was dead and only running on the opposing four cylinders.

Well good news I guess, they spiced the wire and it runs fine again.

 

 

Tahoethumbnail.jpg

  • Like 1
  • Thanks 1
DOUG75 Enthusiast

DOUG75

Posted
  • Author
Posted

"A few weeks ago we were at a dealer and said that we thought the transmission might be doing something strange and they test drove it with ultra soft care (like it hade a 20hp engine)."

 

Pfft took this Tahoe out today, it never ran better.  I remember it sounded a bit strange @ WOT, but not now!!

The wire must have been sparking long ago, probably getting better gas mileage also.

Maybe my luck is changing (o;

 

 

 

 

  

 

  • Like 1

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Recently Browsing   0 members

    • No registered users viewing this page.

  • Forum Statistics

    250.4k
    Total Topics
    2.7m
    Total Posts

  • Member Statistics

    342,760
    Total Members
    8,960
    Most Online
    MASONV88888888
    Newest Member
    MASONV88888888
    Joined

  • Who's Online   1 Member, 0 Anonymous, 1,541 Guests (See full list)

  • Latest Articles

  • Posts

    • MASONV88888888
      Another 6.2L engine failure!

      By MASONV88888888 · Posted

      My 2025 Silverado 1500 had to receive a brand-new engine (long block) under warranty last month at only around 16,500 miles. Before the replacement, the truck repeatedly displayed "Engine Oil Level Low" warnings, even though the Oil Life Monitor still showed around 50% remaining after about 6,000 miles since my last oil change. After seeing the warning several times, I checked the dipstick with the engine cold, and the oil level was completely normal. The next day, the message escalated to "Add Engine Oil." At first, I assumed it was just a faulty oil level sensor, so I brought the truck to the dealership. After inspecting the engine, they found internal cylinder wall scoring and ultimately replaced the entire long block under warranty. Before this happened, I was planning to install a 4-inch lift and suspension upgrade on my truck. After needing a new engine at just 16,500 miles, I honestly don't see the point anymore. I also contacted GM to ask whether my vehicle qualified for a buyback, but I was informed that it does not at this time. Anyway, this experience has left me with serious concerns about the long-term reliability of this engine. I sincerely hope NHTSA expands the current investigation or recall to include 2025 model and performs a thorough inspection of affected vehicles. My biggest concern is that these engines may fail shortly after the powertrain warranty expires. If GM truly stands behind this engine, then at the very least, please consider extending the powertrain warranty to 10 years for affected owners. That would go a long way toward restoring customer confidence.
    • Grumpy Bear
      OCI, not when but why?

      By Grumpy Bear · Posted

      Without exception but then I'm the odd duck, right? I know what goes into that test, how it is calculated and thus how to beat it. But EPA values are often not beaten by the general public and the government has in past years adjusted the means and methods to come to those values to more closely approximate "Joe Average".    The only real trick to beating that EPA average is don't drive like "Joe Average".    It's the same method you used to profit from "Economic Migration" and in doing so beat the 'stats'. But you, like me, are not "Joe Average".     The thing you don't seem to grasp is this "Purchasing Power Index" isn't forward looking. It doesn't predict what it going to be but looks backward and states what it was. They are not telling us what the THINK, they are telling us what they MEASURED. Example:    Wife says "I'm going to lose 40 pounds by Christmas". May she does, maybe she doesn't but the doctors office who weighed her when she made that statement and again at Christmas only REPORTS what the RESULT was. You and I can banter about what was possible and what aunt Tilly did till the cows come home but the result is the result. Arguing otherwise is.....irrational. That's all I'm saying. This isn't about:      What you are calling a 'Statistic' is a RESULT not a CALCUATION and as a result the RULE. Like gravity as a rule, it can not be broken. 
    • MASONV88888888
      Rattle in the rear!

      By MASONV88888888 · Posted

      Just wanted to say thank you for posting this. Years later, your thread is still helping Silverado owners.   I bought my 2025 Silverado 1500 in January 2025, and I've had what feels like the exact same rattle since day one. After reading your findings, I believe my truck has the same issue with the cable carrier contacting the rear sliding window. To be honest, I had pretty much given up on pursuing the issue. It wasn't until I recently drove another brand's pickup that I realized just how quiet their cabin was—and how noisy mine has been all along. On my truck, the rattle happens on almost any paved road, gets even worse on rougher pavement, and I can even hear it during braking and acceleration.   I actually referenced your thread when submitting my case to GM, hoping they'll recognize this as a recurring issue instead of treating it as an isolated incident. The reason I reached out to GM first is because my dealership told me they would need to keep the truck for at least two days just to diagnose the problem. I was concerned that even after two days, they still might not be able to identify the source of the rattle before giving the truck back to me. I had also asked a few dealerships about this issue during previous service visits, but none of them seemed to know what was causing it or had a solution. That's why I decided to contact GM directly first, hoping they might already have an official repair procedure or guidance for this issue.   I also hope GM eventually comes up with an official fix for this problem. I have a feeling there are many Silverado owners experiencing the same rattle, but most either choose to live with it or simply don't know what the cause is.   Really appreciate you taking the time to document your diagnosis. Your post is still making a difference years later.
    • Buckwild27
      Gas Prices

      By Buckwild27 · Posted

      I have 2 choices. 
    • Grumpy Bear
      Gas Prices

      By Grumpy Bear · Posted

      Do you have access to BP fuels? Some stations have Silver 91 E-0 priced the same as their 93 E-10.  There is a local Marathon with 90 alky free for $6 a gallon but I go down the road to BP for $5-ish. They also have a 100 E-0 but that stuff is $10 a pop. 

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...