Jump to content

U0101 / U0129 Codes and CEL

relevante
 Share

Recommended Posts

splatmatt Enthusiast

splatmatt

Posted
Posted (edited)

I have my truck (2019, new body style, crew cab, WT, ~5.5k miles) now at a different dealership. I figured since several dealerships in my area seem slow that they would spend more time investigating the problem.  My codes are like those previously posted by others, but without the P codes.  When I scan the modules (Bluedriver scan tool), codes are either pending or in the history.  It may take several tries to clear the codes leading me to think there is a connection issue to one or several modules (or a short). I dropped the vehicle off Tuesday morning and last night was informed they were going to spend Thursday going into more diagnostics, vague so far but the service advisor seems to be willing to help (unlike the previous dealership I went to several times). 

 

 

 

 

Edited by splatmatt
  • Replies 40
  • Created
  • Last Reply

Top Posters In This Topic

Popular Days

Top Posters In This Topic

Popular Days

Popular Posts

relevante
relevante

I just signed up for a 1 day repairprocedures.com subscription. It's $15, but they have a pretty awesome archive of info, including what appears to be a full service manual.   Anyway, the de

splatmatt
splatmatt

Some good news:  My dealership called moments ago and said that Chevy had new module updates (posting yesterday) regarding this issue and that they are going to apply them today and further test drive

splatmatt
splatmatt

I had the same issue prior to the last update in performed in Feb.    

Posted Images

Brizzo Jenkins Enthusiast

Brizzo Jenkins

Posted
Posted
18 minutes ago, splatmatt said:

I have my truck (2019, new body style, crew cab, WT, ~5.5k miles) now at a different dealership. I figured since several dealerships in my area seem slow that they would spend more time investigating the problem.  My codes are like those previously posted by others, but without the P codes.  When I scan the modules (Bluedriver scan tool), codes are either pending or in the history.  It may take several tries to clear the codes leading me to think there is a connection issue to one or several modules (or a short). I dropped the vehicle off Tuesday morning and last night was informed they were going to spend Thursday going into more diagnostics, vague so far but the service advisor seems to be willing to help (unlike the previous dealership I went to several times). 

A lot of people seem to have this issue after getting the last brake service module recall completed. I got mine completed about a month ago. All was fine until today. I’m thinking the two are connected somehow. Definitely smells like a software issue. But dang, how many more times do we need to get this thing software updated.

splatmatt Enthusiast

splatmatt

Posted
Posted
Quote

A lot of people seem to have this issue after getting the last brake service module recall completed. I got mine completed about a month ago. All was fine until today. I’m thinking the two are connected somehow. Definitely smells like a software issue. But dang, how many more times do we need to get this thing software updated.

 

I had the same issue prior to the last update in performed in Feb.

 

 

  • Like 1
splatmatt Enthusiast

splatmatt

Posted
Posted (edited)

Some good news:  My dealership called moments ago and said that Chevy had new module updates (posting yesterday) regarding this issue and that they are going to apply them today and further test drive on Monday to confirm.  I will let you know more when I get the truck back and post any relevant info.

 

****Update

Dealer said they applied TSB# PIT5735a which I believe is this:

 

https://static.nhtsa.gov/odi/tsbs/2020/MC-10173676-9999.pdf

 

No error codes - I will update later this week


 

So basically the brake module is staying on (after turning vehicle off) and reading the wheel sensor. Dealer said they flashed brake module with new firmware to fix issue. The TSB dated 3/4 mentions that GM will provide an update later to correct issue. From my understanding the dealer just got this new update a few days ago. Time will tell. 

So if all of the error codes are listed under the brake module then this is your problem. In my case, the bluedriver scanner shows the truck's error codes were from the brake module. 

 

Edited by splatmatt
update
  • Like 2
  • 3 weeks later...
Z71NY Enthusiast

Z71NY

Posted
Posted

Add me to the club. 19 Silverado Z71 Had oil change and brake reprogram recall done last week. Check engine on today with U0100, U0101, U0146 and P25A2. Check engine now off when I shut it off and started it ten min later. 

Brizzo Jenkins Enthusiast

Brizzo Jenkins

Posted
Posted

I originally had the brake control module software update done 2 months ago.  (Brake pad life Remaining percentage was counting down too fast).  I got my first check engine light with codes about a week after that.  I used my scan tool and cleared the codes. 
 

but then, 2 weeks ago, I get a letter from big (corporate) Chevrolet saying that there is an issue with the brake control module software that needs to be addressed.  The letter also stated that, “even if you have already had the software update done in the past, it will need to be re-updated again.“ so I took my truck back to the dealer again, 2 days ago for the second time for this same “update”. Guess the first software update had a bug.  
 

so far so good with no check engine light or engine codes. Idon’t know if the faulty software update and the engine codeissue is related, but so far so good.  I’ll keep you all updated


 

 
  •  
  • 4 weeks later...
Elpresidente Enthusiast

Elpresidente

Posted
Posted (edited)

Gentlemen we have a fix.  PIT5735B has corrected the issue.  I had the software update for the BSCM/brake module controller applied to my truck on May 27 2020.  The PDF does not look like it is published online yet, so it is attached below.

 

Had a GM engineer apply the BSCM with the mechanic at the dealership.  The engineer also mentioned the PIT5730A & PIT5735B are both addressed in the same latest software update.

 

If you read the description it is caused by the vechicle just rolling a little when parked.  Although have never had a auto issue raise so many codes period; especially for a root cause being so minor.

 

20200529085624982.pdf

Edited by Elpresidente
  • Like 1
  • 7 months later...
Vickroy New Member

Vickroy

Posted
Posted (edited)

Wanted to add in my experience here.   Had same CEL and codes thrown after 13K miles, so I scheduled an appt with local dealership.   Three engine cycles later the light went out and codes went to ‘historical’ status.  
 

When I got to the dealership, the check in guy said “if no current light, the we can’t help ya” and tried to send me on my way.   I insisted they look at it and after a 5 min back and forth they agreed to bring it back and take a look.
 

Thirty min or so later they came back and said they just so happened to find a ‘software bug’ and reprogrammed the BSCM.  
 

The service bulletin related to this bug was listed on work order: 20-na-155 (Image Attached) 

 

C366384C-A2E1-4B25-A62A-5868D1817488.jpeg

Edited by Vickroy
  • 2 months later...

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

    250.3k
    Total Topics
    2.7m
    Total Posts

  • Member Statistics

    342,732
    Total Members
    8,960
    Most Online
    user087
    Newest Member
    user087
    Joined

  • Who's Online   3 Members, 0 Anonymous, 769 Guests (See full list)

  • Latest Articles

  • Posts

    • Grumpy Bear
      OCI, not when but why?

      By Grumpy Bear · Posted

      Here's a starter kit:    CC Jensen, a Danish oil testing Concern gives us the following guidelines:   ISO 14/12/10 Very Clean Oil ISO 16/14/11 Clean Oil ISO 17/15/12 Lightly Contaminated ISO 19/17/14 New Oil ISO 22/20/17 Very Contaminated and not suitable for any service.   In addition CC Jensen gives a table showing how engine life is increased by cleaning up the oil. For example cleaning the oil from 19/17/14 to 13/11/8 will extend motor life by a factor of 6X.   But even cleaning it two “Life Extension Classes” will double motor life. So perhaps giving those classes would be useful:   21/19/16 20/18/15 19/17/14 18/16/13 17/15/12 16/14/11 15/13/10 14/12/9 13/11/8   *************************************   https://testoil.com/program-management/setting-iso-cleanliness-targets/   Third paragraph from the bottom will give a starting point.    Your next question should be, okay 10um at what Beta ratio and the answer is in the graph Beta 75.   Then the next question is what is your chosen filters profile? (Purolator PL series below) The red dot is Beta 75. This was the information I obtained from MANN a few years ago. So the best filters, Purolator One, AMSOIL EA, FRAM Ultra, Royal Purple, Bosch Premium should get a doubling engine life over filters like Purolator L, any service filter from any quick lube, WIX, NAPA, STP, Mobil 1, Purolator BOSS.    And as noted by CC Jensen a 2-5 micron @ Beta 200 bypass system has the capability of a six fold improvement. AMSOIL has such a system as does Donaldson.       Now having said all that testing is the touchstone. Test the oil NEW and test it with your chosen filter. Then test over milage. Do the work, get the result. But understand this in NOT absolute BECAUSE this is one factor in isolation.   Example:    A valve spring supplier can state that with cam X and a valve train of Y grams the valves will not float to 7K rpm. is that true if the builder choose a system 20 grams over limit? Common sense must be used and limits understood. 
    • bruceb58
      Road Master Active Suspension

      By bruceb58 · Posted

      This doesn't look like a GM truck. Not needed on a HD truck
    • CamGTP
      Gas Prices

      By CamGTP · Posted

      It varies a ton around me. Some places are still at $5.00 or higher and others are way down into the $4's.   Offroad diesel was $4.02 at the one station I passed today.
    • Hdwrguy
      2027 Chevrolet Silverado: Official Discussion

      By Hdwrguy · Posted

      So after reading the reveal from Chevrolet, I kept asking myself...why did the trim levels change?   Here are the official ones:   Work Truck (WT): The quintessential fleet truck, built with durable, easy-to-clean interiors for commercial or utilitarian use. Custom: A stylish, road-oriented trim that adds a more refined appearance, standard dual exhaust, and modern exterior styling. Custom Trail Boss: An entry-level off-roader featuring a 2-inch factory suspension lift and 34-inch mud-terrain tires on a budget. Silverado: Serving as the new base consumer truck (replacing the previous LT trim), it comes standard with the Z71 off-road package when equipped with 4WD. Trail Boss: Steps up the off-road hardware with the 2-inch lift, 34-inch tires, monotube shocks, an exclusive off-road hood, and more premium interior options. ZR2: The flagship off-roader. It boasts 35-inch mud-terrain tires, Multimatic DSSV dampers, front and rear electronic lockers, forged carbon-fiber interior accents, and an available hardcore Bison Edition (co-developed with AEV). High Country: The pinnacle of luxury. It replaces bright chrome with modern satin chrome, 22-inch wheels, premium leather, real wood interior trim, a panoramic sunroof, and an exclusive front-passenger touchscreen. As others have stated, why would you want a Silverado - 'Silverado' - wth?? LT needs to remain!!!   Also, there will no longer be a dedicated Z71 model.  All 4x4 trucks will have the Z71 package. Carplay is also something that cannot be removed.  Hopefully it will remain.     I am excited about the 5.7L V8 (350 C.I.D.)  Old school Chevy power.  My only concern is whatever version of AFM/DFM cylinder deactivation.  Too bad that isn't an option a buyer can choose to have or not.   I will definitely be stopping by my local dealership when these trucks start showing up.
    • richard wysong
      Gas Prices

      By richard wysong · Posted

      I haven't seen diesel for less than $5.30 anywhere in my area

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...