Jump to content

Endless Engine light display

Sarah Ivankovich
 Share

Recommended Posts

Sarah Ivankovich New Member

Sarah Ivankovich

Posted
Posted

First time Chevy owner..first post- My 2021 Silverado Trailboss LT has a check engilne light that comes on about evey 300 miles.  It is a generic p300 code.  Onstar tells me to bring it in, chevy service/dealer says it looks fine, and the code is generic so they can't fix anything.  The 3rd time they said they would contact GM for a more thourough inspection- the GM tech says they are aware of the issue, and released a service bulliten on 7/30 about the code.  No solution as of yet, so they advised- just drive it, ignore the check engine, and they will contact me when they have a solution.  Is this how Chevy typically works?  I have never heard of ..hey we know something is wrong, but we cant fix it, so just keep driving.  Has anybody else had this code issue resolved?

fastk9dad Enthusiast

fastk9dad

Posted
Posted

Unless you are also experiencing drivability issues then I would say give them time. It could be completely a software glitch and nothing actually wrong with the truck. a P300 is a symptom code for when the computer detects 2 or more cylinders misfiring. Without more specific codes for exactly which cylinders or for some other sensor the mechanics would just be spinning their wheels guessing at what the cause might be.

JimCost2014 Senior Enthusiast

JimCost2014

Posted
Posted
44 minutes ago, Sarah Ivankovich said:

First time Chevy owner. First post- My 2021 Silverado Trailboss LT has a check engine light that comes on about every 300 miles.  It is a generic p300 code.  Onstar tells me to bring it in, Chevy service/dealer says it looks fine, and the code is generic so they can't fix anything.  The 3rd time they said they would contact GM for a more thorough inspection- the GM tech says they are aware of the issue, and released a service bulletin on 7/30 about the code.  No solution as of yet, so they advised- just drive it, ignore the check engine, and they will contact me when they have a solution.  Is this how Chevy typically works?  I have never heard of ..hey we know something is wrong, but we cant fix it, so just keep driving.  Has anybody else had this code issue resolved?

Welcome to the site.

 

If you do not like the answer they keep giving you, take it to another Chevy dealer and see what they say.

It is your truck, you have no obligation to keep going back where you bought if you feel that you are not being treated appropriately.

And, make sure that all of this is being documented, in case you do have a failure, there will be records.

kmeleon Enthusiast

kmeleon

Posted
Posted
5 hours ago, Sarah Ivankovich said:

First time Chevy owner..first post- My 2021 Silverado Trailboss LT has a check engilne light that comes on about evey 300 miles.  It is a generic p300 code.  Onstar tells me to bring it in, chevy service/dealer says it looks fine, and the code is generic so they can't fix anything.  The 3rd time they said they would contact GM for a more thourough inspection- the GM tech says they are aware of the issue, and released a service bulliten on 7/30 about the code.  No solution as of yet, so they advised- just drive it, ignore the check engine, and they will contact me when they have a solution.  Is this how Chevy typically works?  I have never heard of ..hey we know something is wrong, but we cant fix it, so just keep driving.  Has anybody else had this code issue resolved?

See my thread here. Same issue, been going on since february/March. Can you tell me how you're driving it when the light goes off? How fast? Pulling away from a stop? Driving steady down the road? Etc? 

 

Mine occurs pulling away from a rolling stop while turning. 

 

 

kmeleon Enthusiast

kmeleon

Posted
Posted

Also, I bet if you have a code reader you'll see misfires on cylinder 1 and possibly another one (mine shows on 6 too). But it only throws P0300 which is a generic misfire code. If you look through the cylinder data you'll see misfires I bet. 

redwngr Senior Enthusiast

redwngr

Posted
Posted

This was published over the summer.  Seems there is a calibration update?

 

https://gm-techlink.com/?p=15026

 

Engine Misfire Detected without Drivability Concerns

July 16, 2021

An engine misfire DTC may be set on some 2020-2021 Silverado 1500 and Sierra 1500 models equipped with the 5.3L V8 engine (RPO L84). However, the misfire may not be noticed by the driver or the vehicle may not have any drivability concerns. The Check Engine MIL may be illuminated (Fig. 😎 or may have been flashing while driving up a long grade or a smooth road with steady throttle input. DTC P0300 (Engine Misfire Detected) may be set as active or history in the Engine Control Module (ECM).

 

F08-check-engine-2.pngFig. 8

 

The detected misfire condition may be the result of the P0300 diagnostic falsely setting the DTC under certain driving conditions. GDS2 data may show misfires being recorded on any cylinder, but they may be more noticeable on cylinders 1 and 6.

To address the detected misfire condition, an updated calibration has been released. Reprogram the ECM with the latest calibration and perform the Crankshaft Position Variation Learn procedure. Do not replace any parts for the condition.

TIP: To avoid warranty transaction rejections, the warranty claim code provided on the SPS Warranty Claim Code (WCC) screen must be recorded on the job card (repair order).

The updated calibration does not address any true engine misfire. It only updates the P0300 diagnostic in the ECM. If the engine is actually misfiring, refer to the appropriate Service Information for additional diagnostic information.

Once the calibration has been updated, drive the vehicle and verify the DTC does not set.

 

Crankshaft Position Variation Learn Procedure

The Crankshaft Position Variation Learn procedure must be performed or the updated calibration will not provide the desired results.

The crankshaft position sensor variation or reluctor ring learn is used to calculate reference period errors caused by slight tolerance variations in the crankshaft and the crankshaft position sensor. The calculated error allows the ECM to accurately compensate for reference period variations, which enhances the ability of the ECM to detect misfire events over a wider range of engine speed and load. The compensation values are stored in ECM memory after a learn procedure has been performed.

For additional information, refer to Bulletin #21-NA-154.

fastk9dad Enthusiast

fastk9dad

Posted
Posted
8 hours ago, 1997SierraSLT said:

Welcome to the life of GM ownership.  With as many times as you’ll be seeing that CEL, GM should just be giving you a scan tool with every vehicle purchase.

 

In my '09 Tahoe w/ 5.3 I saw the money light exactly once... at 180k when the evap vent valve bit the dust.

kmeleon Enthusiast

kmeleon

Posted
Posted
10 hours ago, fastk9dad said:

 

In my '09 Tahoe w/ 5.3 I saw the money light exactly once... at 180k when the evap vent valve bit the dust.

He's a troll. It's all he ever posts. 

  • Like 1
Dweston New Member

Dweston

Posted
Posted
On 8/31/2021 at 10:41 AM, Sarah Ivankovich said:

First time Chevy owner..first post- My 2021 Silverado Trailboss LT has a check engilne light that comes on about evey 300 miles.  It is a generic p300 code.  Onstar tells me to bring it in, chevy service/dealer says it looks fine, and the code is generic so they can't fix anything.  The 3rd time they said they would contact GM for a more thourough inspection- the GM tech says they are aware of the issue, and released a service bulliten on 7/30 about the code.  No solution as of yet, so they advised- just drive it, ignore the check engine, and they will contact me when they have a solution.  Is this how Chevy typically works?  I have never heard of ..hey we know something is wrong, but we cant fix it, so just keep driving.  Has anybody else had this code issue resolved?

Looks like I found the right site! I purchased a new 2021 Trail Boss 5.3 in March. With in the first 600 miles check engine light came on, dealership said it was bad injectors 1 and 6, which they replaced. Four months later same thing happened, this time they brought in a GM Tech adviser and "reprogramed" the truck. This was after having it for a month. I just got it back and after a month same issue. I took it in and after having it for a week waiting on GM I was called today and told to pick it up tomorrow. The check engine light will be on but its ok to drive until we get another update! So GM wants me to knowingly drive a vehicle that is not working properly. I am in the middle of a buy back and have been denied by GM. I can't tell you how disappointing it is to deal with a manufacture that will not stand behind their product.

 

kmeleon Enthusiast

kmeleon

Posted
Posted
9 hours ago, Dweston said:

Looks like I found the right site! I purchased a new 2021 Trail Boss 5.3 in March. With in the first 600 miles check engine light came on, dealership said it was bad injectors 1 and 6, which they replaced. Four months later same thing happened, this time they brought in a GM Tech adviser and "reprogramed" the truck. This was after having it for a month. I just got it back and after a month same issue. I took it in and after having it for a week waiting on GM I was called today and told to pick it up tomorrow. The check engine light will be on but its ok to drive until we get another update! So GM wants me to knowingly drive a vehicle that is not working properly. I am in the middle of a buy back and have been denied by GM. I can't tell you how disappointing it is to deal with a manufacture that will not stand behind their product.

 

Can you explain when your SEL light starts blinking? How fast, pulling away from a stop? Steady speed? Light acceleration? 

Dweston New Member

Dweston

Posted
Posted

After Start up 1/4 of mile from home. Started blinking for 1/2 mile then stayed solid. Took it to the dealer now waiting for a calibration upgrade for the 10 speed trans. They cleared the code, light is off and no idea when GM will find the fix. 

 

kmeleon Enthusiast

kmeleon

Posted
Posted

This is exactly how mine get set off as well. Usually within a quarter mile of my house or wherever I'm leaving. Usually pulling away from a stop sign and less than 20 miles an hour. Mine has went off 30 some times in 7 months. 

kmeleon Enthusiast

kmeleon

Posted
Posted
5 hours ago, Dweston said:

After Start up 1/4 of mile from home. Started blinking for 1/2 mile then stayed solid. Took it to the dealer now waiting for a calibration upgrade for the 10 speed trans. They cleared the code, light is off and no idea when GM will find the fix. 

 

How do you know it's the transmission causing the issue? Did the dealer tell you that?

Dweston New Member

Dweston

Posted
Posted
22 hours ago, kmeleon said:

How do you know it's the transmission causing the issue? Did the dealer tell you that?

According to the dealer and the GM tech, there also is a bulletin about this #PIP5816 

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

  • Latest Articles

  • Posts

    • Chuck FB
      Towing In Loose Gravel

      By Chuck FB · Posted

      I agree, there is no one answer fits all as every rig is different, one may be pulling some little aluminum fishing boat while another is towing a monstrosity that weighs a lot and hopefully the owner if the rig has some prior experience to know what drive mode they should choose.    It also struck me and this is from watching a few of those boat ramp escapades videos in the past, Ford being one of the vehicles that has the auto front axle hubs and sure enough its found out that one hub has crapped out and won't engage and may not have manual hubs to even select on both sides so they are on the boat ramp stuck with no four wheel drive and spinning .... they flat out need a tow to get up the ramp and deal with the vehicles new found issues. That can happen to all brands of pickup, finding out either four wheel drive or 4 low isn't working right at the time its needed it to work as some electronic crap has failed. 
    • Chuck FB
      Towing In Loose Gravel

      By Chuck FB · Posted

      Its possible you never had the joy of the crappy boat launches we tend to have around here or really some of them are just grades down to the river if its a river scenario and the conditions change all the time with the river levels and silt deposits. Some of the lakes we went to years ago, there was no such thing as a cement pad that went down into the water that the trailer stayed on, it was gravel maybe up to the water line and then duck crap much beyond that so sinking the boat tires into mud. Of course some of the more established lakes had a cement bar type boat ramp but sometimes it was covered in green slime closer and certainly within the water and a two wheel drive had all sorts of fun if one had to touch that slime with the rear tires.    A neighbor of mine had made a comment years back with his chev truck that was probably about the same year as yours but a half ton extended cab 4x4 and he a a fiberglass boat with an inboard so it wasn't a feather weight and he had gone out to one of the large popular lakes in the area and don't ask me how this happened but he was in two wheel drive as he figured he didn't require four wheel drive for that boat ramp and somehow upon pulling the boat out he twisted one of his drive axles. I suspect it must have spun and then grabbed on the cement ramp and shocked it to the degree of twisting it. He would have had the standard 8.5 or whatever it was axle housing as the 9.5 ring gear like my truck has also has larger drive axles as far as I know. Anyway he was feeling a vibration driving home and had it checked out and a shop found that the tire/hub was wobbling because of the axle had twisted so in went a new drive axle. After that bad experience he said he made sure to put it into four wheel drive to lower the stress on the rear axle. Of course that is where an HD truck can handle a lot more stress and no doubt these newer half tons with their larger ring gears probably have larger drive axles as well to match vs back in the day. 
    • asilverblazer
      2027 GMC Sierra: Official Discussion

      By asilverblazer · Posted

      Desirable - as in does someone WANT one, aspire to have one. Could reasonably buy any car they want and CHOOSE these instead.    I didn't watch the video, why did they win?
    • Atlas
      Towing In Loose Gravel

      By Atlas · Posted

      The use of absolutes like "always" to describe gear selection, and giving free advice at a boat ramp sounds like a recipe for disaster. It's a boat ramp, not a farm, for starters.   IMO gear selection should depend on the obstacle. If low range is working and this is a slower speed, controlled ordeal, I'd keep using that.
    • diyer2
      Towing In Loose Gravel

      By diyer2 · Posted

      I had a boat for many years, never had a problem even with a 2 wheel drive 93 Silvy for 20 years. Good tires, proper use of the gas pedal worked.

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...