Jump to content

Recall - Vacuum Pump May Decrease Power Brake Assist

Retired Bob
 Share

Recommended Posts

Sierra Dan Senior Enthusiast

Sierra Dan

Posted
Posted

This recall however does not take care of the known faulty Vacuum Pump. Faulty Pump recall came about a few months back where they replace the pump if

a loss of braking power is detected. 

This software update is a band aid quicker and cheaper fix than replacing the root problem.

Aside from a possible loss in braking power...……..when the pump goes, it causes metal shavings to enter the oil system thus possibly grenading the engine.

Which is another good reason for replacing the newer upgraded Vacuum Pump.

 

  • Replies 206
  • Created
  • Last Reply

Top Posters In This Topic

Popular Days

Top Posters In This Topic

Popular Days

Popular Posts

camcamaro1991
camcamaro1991

As a former discount tire employee (days of 5 were hired and only 3 could keep their job, today auditions are gone), started back in the firestone/ford recall days, and later becoming a MB Master tech

jay webb
jay webb

ok the special coverage is for a faulty vacuum pump which is a mechanical pump attached to the engine. this is not a  recall. the recall is a reprogram of the EBCM software. two separate things. now i

Mike GMC
Mike GMC

So now we need an extended warranty on the ABS unit to cover premature wear from using it in normal braking?  Seems like yet another band aide to me.  That Corvette electric pump is looking better and

Posted Images

KARNUT Senior Enthusiast

KARNUT

Posted
Posted

Seems all the V-8s I owned didn’t have to this problem prior to the 14 model. Without much research I bought my 14. After joining this forum and learning about cylinder deactivation and all it involves I unloaded it. I was having flashbacks to the 5.7 diesel. External vacuum pump, what the hell. I’m done with new GMs unless they use a normal engine again.


Sent from my iPhone using Tapatalk

dsatwork Enthusiast

dsatwork

Posted
Posted

I just got back from towing my 27' Airstream with my heavily loaded 2015 Silverado 5.3 1500 3.73 from San Diego to (Show Low) White Mountains in AZ via the Salt River Canyon and had to brake hard once with the trailer and once without the trailer on this trip and neither one felt right. First I thought it was because of the heavy load, but when it happened empty without the trailer, it made me wonder if there was an issue. The only other factor was that I had the brake lines flushed just before I took off, so at first it felt a little funny because of that as well. Regardless, I'm scheduled to get the system reprogramed next week before I head up to Idllywild for the weekend. Don't use my brakes much when towing and depend on the Tow Haul mode to keep me safe coming down 6% grades. 

1SLOW1500 Senior Enthusiast

1SLOW1500

Posted
Posted
I just got back from towing my 27' Airstream with my heavily loaded 2015 Silverado 5.3 1500 3.73 from San Diego to (Show Low) White Mountains in AZ via the Salt River Canyon and had to brake hard once with the trailer and once without the trailer on this trip and neither one felt right. First I thought it was because of the heavy load, but when it happened empty without the trailer, it made me wonder if there was an issue. The only other factor was that I had the brake lines flushed just before I took off, so at first it felt a little funny because of that as well. Regardless, I'm scheduled to get the system reprogramed next week before I head up to Idllywild for the weekend. Don't use my brakes much when towing and depend on the Tow Haul mode to keep me safe coming down 6% grades. 
Sorry have to ask. Did you set up and use a trailer brake?

Sent from my SM-N960U using Tapatalk

dsatwork Enthusiast

dsatwork

Posted
Posted

Yes, and I keep the trailer brake screen on the dash front and center, when I first take off to make sure everything is connected. No offense taken, been on these forums long enough to know that the obvious isn't as obvious as you would think and hope.

dsatwork Enthusiast

dsatwork

Posted
Posted
1 hour ago, 1SLOW1500 said:

Sorry have to ask. Did you set up and use a trailer brake?

Sent from my SM-N960U using Tapatalk
 

Yes, and I keep the trailer brake screen on the dash front and center, when I first take off to make sure everything is connected. No offense taken, been on these forums long enough to know that the obvious isn't as obvious as you would think and hope.

  • Like 1
15 Z71 Senior Enthusiast

15 Z71

Posted
Posted

I had  got a letter saying they would extend the warranty for 6 years or 72,000 miles for this issue. My question is if I take it for this re program and have the pump go out down the road will they still repair it if I'm under the special coverage? Or should I just wait until my special coverage is getting closer to running  out? Or they going to try and say the re program is the fix the letter means nothing now?

16LT4 Enthusiast

16LT4

Posted
Posted
7 hours ago, TXGREEK said:

 


Discount Tire does it for free emoji6.png

 

Who the heck is that and why would I trust a high school drop out to touch my truck? Dealer provides 2 free rotations, so if convenient I’ll do them. 

 

I can rotate them for free too and do on my other 4, but the recall is the final impetus to drag myself the 5 miles down there to the dealer. 

TXGREEK Senior Enthusiast

TXGREEK

Posted
Posted
Who the heck is that and why would I trust a high school drop out to touch my truck? Dealer provides 2 free rotations, so if convenient I’ll do them. 
 
I can rotate them for free too and do on my other 4, but the recall is the final impetus to drag myself the 5 miles down there to the dealer. 


I assure you, a college degree is not required to change oil or change a tire lol. Sounds like you’ve got it all figured out
  • Like 2
Mikebtte Enthusiast

Mikebtte

Posted
Posted (edited)
11 minutes ago, TXGREEK said:

 


I assure you, a college degree is not required to change oil or change a tire lol. Sounds like you’ve got it all figured out

 

Haha, yup. If not for highschoolers I would never find technicians. 

I have gotten a few fresh out of trade school only to find out they wasted some money's.

Had one fresh out of school that was unable to change a belt.

If the shop does have a knowledgeable tech, you can bet he ain't doing tires. 

Edited by Mikebtte
Words.
  • Like 2
16LT4 Enthusiast

16LT4

Posted
Posted (edited)
16 minutes ago, TXGREEK said:

 


I assure you, a college degree is not required to change oil or change a tire lol. Sounds like you’ve got it all figured out

 

I never mentioned college?

 

I seldom let a “trained professional” do any work for me because it’ll always be more work for me to fix their mistakes. Some lackey moron touching my truck is asking for trouble; I know I’ll have to retorque my lugs when I get home, but at least the dealer has more to lose if something goes wrong, and my lift is occupied. 

Edited by dukedkt442
TXGREEK Senior Enthusiast

TXGREEK

Posted
Posted
I never mentioned college?
 
I seldom let a “trained professional” do any work for me because it’ll always be more work for me to fix their mistakes. Some lackey moron touching my truck is asking for trouble; I know I’ll have to retorque my lugs when I get home, but at least the dealer has more to lose if something goes wrong, and my lift is occupied. 


Most likely, same tech schools, Discount Tire is a fantastic company that I’ve brought my daily driver and exotic toys to throughout many years with zero issues.
  • Like 1
jay webb Enthusiast

jay webb

Posted
Posted
13 hours ago, 1SLOW1500 said:

I think you will find people will be cleaning and rebuilding the pumps in the future. Also doing line clearing to judge the health of the pump.

I know GM will not switch over, however the electric pumps found on the Corvette seem a better option.

Sent from my SM-N960U using Tapatalk
 

i have replaced two brake module/vacuum pump/booster assemblies on the 2019s already. its an all in one unit. the only part that is separate is the  fluid reservoir. they have software issues. its all electronic.  

jay webb Enthusiast

jay webb

Posted
Posted
1 hour ago, 15 Z71 said:

I had  got a letter saying they would extend the warranty for 6 years or 72,000 miles for this issue. My question is if I take it for this re program and have the pump go out down the road will they still repair it if I'm under the special coverage? Or should I just wait until my special coverage is getting closer to running  out? Or they going to try and say the re program is the fix the letter means nothing now?

ok the special coverage is for a faulty vacuum pump which is a mechanical pump attached to the engine. this is not a  recall. the recall is a reprogram of the EBCM software. two separate things. now i think gm is thinking if they change how the abs/ebcm uses the vacuum will prevent the pumps from wearing out. as a tech who has change 50ish of these pumps under special coverage i believe its a lack of proper oil changes, its attaches the engine and supplied oil from the oil system. people dont change their oil properly. wait til its says change oil soon/ or 0% or going 1000s of miles pass 0% oil life. I KNOW what is the point of the oil life monitor system? well its to inform you to change your oil but its based on software that uses an algorithm based on engine use/conditions. i have a 2018 sierra. i change my oil every 5000 i dont wait for the truck to tell me.  

  • Like 4
bkesting Enthusiast

bkesting

Posted
Posted
7 hours ago, Sierra Dan said:

This recall however does not take care of the known faulty Vacuum Pump. Faulty Pump recall came about a few months back where they replace the pump if

a loss of braking power is detected. 

This software update is a band aid quicker and cheaper fix than replacing the root problem.

Aside from a possible loss in braking power...……..when the pump goes, it causes metal shavings to enter the oil system thus possibly grenading the engine.

Which is another good reason for replacing the newer upgraded Vacuum Pump.

 

So there is a newer style pump? If so, is it hard to change out?

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

    • Atlas
      Wow I'm in a pickle. (Broke down truck) and a story.

      By Atlas · Posted

      I will be doing that for sure, but I need to solve who has/ where I can find a bidirectional scan tool that will support OBD 1.5. I'm kicking myself because I ebay'ed a Snap On MT2500 that I didn't think I'd ever need anymore. D'oh!! I'd rather not buy another, so I'll contact a few local shops to see if they have one and how much they'd want to do the procedure. I'd rather have the ability to do it myself... I wish there was a modern tool that could do it all, but I'd have no idea what to buy.   The theory with the pulled timing is that it mimics a rich condition. The delayed spark causes incomplete burn and the O2 sensor picks up low oxygen levels. That's interpreted as a rich condition so the PCM pulls fuel and that shows up in the deeply negative fuel trims.
    • Chuck FB
      Joke Thread

      By Chuck FB · Posted

      An ultra wealthy man had the most beautiful daughter. But, there was a problem. Everything she touched would melt in her hands. No matter what, Metal, Wood, Stone. Anything she touched would melt. She could not feed herself. Because of this, men were afraid of her. Nobody would dare marry her. Her father was despaired. What could he do to help his daughter? He consulted doctors, scientists and anybody who could solve this problem. Finally one of them said, "If your daughter touches one thing that does not melt in her hands, she will be cured." He was overjoyed and came up with a plan. The next day, he held a competition. Any man who could bring his daughter an object that would not melt in her hands would be given billions of dollars to marry her. Three extremely intelligent and handsome young men took up the challenge. The first brought a very heavy steel rod, But alas, when the she touched it, it completely melted in a matter of seconds. He sadly went away. The second brought a beautiful diamond, knowing diamonds were one of the hardest substance in the world and would not melt. But alas, once she held it in her hand, it melted. He too was sent away disappointed. So now, there was one left He was very nervous & sweating. He approached the daughter & said, “put your hand in my pants pocket and feel what is in there." She did exactly what he asked. She felt something very hard. She held it in her hand, squeezing it as hard as she could. It did not melt & remained extremely hard. Her father was overjoyed. Everybody was overjoyed. She was finally cured. Nothing never, ever melted in her hand again. They married and they both lived happily ever after, raising a wonderful family. Question: What was in the the groom’s pants pocket??? Answer below ↓ M&Ms of course! They melt in your mouth, not in your hand. What on earth were you thinking?
    • asilverblazer
      Wow I'm in a pickle. (Broke down truck) and a story.

      By asilverblazer · Posted

      There's a bunch of tea leaves that you've read, but in any case the delayed timing is unusual. Not sure how that relates to the rich at idle vs. 'normal' while driving.   If you're in this deep, might be worth investigating, and re-learning the sensor. What have you got to lose? Plus, it properly fixes the timing cover leak.
    • asilverblazer
      Wow I'm in a pickle. (Broke down truck) and a story.

      By asilverblazer · Posted

      The only problem I have seen this cause is longer crank times. 
    • Atlas
      Wow I'm in a pickle. (Broke down truck) and a story.

      By Atlas · Posted

      Injector is being sent off today for rebuild and I estimate I'll have it back in 10 days or so.   It may not be the injector...of course...now that I've torn down the intake again. But, let's rule out the injector and replace those spider legs that have been almost rubbed through.   The truck has always had negative timing and I'm reading "normal" timing at warm idle should be +16 or so. I'm negative 16 to 25 or more, and it's always been like that since I bought it.   A light turned on upstairs last night in the old noggin. Rare, I know...   This will be wild, if it turns out to be the cause!   In 2001, according to the old service documentation, the muffler was replaced. Why? I have no idea, it wouldn't have been rusted through by then. But they did a crappy job.   In 2019, another shop replaced it and noted the prior install was poorly done on the work order. "Exhaust system vibrates on crossmember". Except...I guess they just left it be? I believe the husband, the couple who were original owners, had passed by then. Maybe she said it's just not worth it to have the exhaust system fixed and declined repairs. Very few miles were driven between 2019 and 2025.   The exhaust system vibrates heavily on the crossmember and you can feel it and REALLY hear it, even today. Not always, but at idle, it gets going pretty good sometimes.   What if....   ....What if that's enough to trigger one or both of the knock sensors? Could it be tricking the sensors into sensing knock, so it's pulling timing aggressively? Pulling timing heavily means it's firing after the piston reaches full height which means incomplete burn which means the O2 sensor is sensing a rich condition, which means I've been chasing my tail, and what I thought was an inconsequential problem (janky exhaust) has been THE issue for this truck for 25 solid years?   That would be wild. Maybe it IS wild.   The service documentation thereafter, for years, shows visits for rough idle, replacing O2's, replacing the cat, replacing plugs and wires, a misfire condition, like they could never solve the issue. The injector has been replaced 4 times in 80k miles, that's just crazy.   The secondary theory....   The engine has clearly had a leak at the front seal for a very long time (the greasy trench...). I think the truck changed hands quickly ~2025 because there's Napa receipts from someone I don't recognize in the ownership history. They apparently replaced the timing cover seal, and they did a terrible job. There's RTV smeared all over and the leak I had reduced to a weep by snugging the front oil pan bolts is now a leak again.   HOWEVER....I read about replacing the crankshaft position sensor. Any time the ckp sensor is disturbed or timing cover is removed, the truck requires relearning, and that can only be done through a bi-directional scan tool. Skippy with the RTV probably didn't do the relearn procedure is my guess. His scan tool is lost in a pile of RTV goo somewhere.   So, it's very possible the sensor has been disturbed and the truck is just running on the old learn data but not setting a code for anything. The distributor has since been replaced and so has the camshaft position sensor, so all bets are off for that thing.   In the theme of one step forward, two steps back, I returned the accumulator for the AC. The gal I've been working with at O'Really's has been great. She refunded it under manufacturer's defect and we compared it to the replacement I ordered, and sure enough, the replacement is machined very differently (and a gauge actually fits on it!).   Got it home, installed it, started vacuuming it down.... and I couldn't get good vacuum.   The high side service port, where I replaced the old GM ball valve suspecting that was a source of the previous leak....well, I've clearly exposed whatever pre-existing crack in the line where the service port is welded, and made it much worse. Blessing in disguise? Except there goes another $25, now I'm waiting for a replacement AC line.   In 10-ish days ALL the parts will be here. Rebuilt injector, new exhaust system, new cat, new high pressure AC line.   Oh, did I mention the squeaking ISN'T coming from the AC pump? The truck still squeaks when started, and there were words after I started it with the new AC pump installed. But, there was more to replacing the AC pump for just a squeak. A truck with good working AC is something of value, for the comfort alone.   I've ordered a new harmonic balancer because, 30 years is a good run for one of those. Rule it out. The squeak may be something more sinister, though. I'm worried about that ckp sensor and if it was shimmed correctly, or if the timing set was installed correctly. The squeak may be coming from UNDER the timing cover.   At this point, once I get it put back together, I'm thinking I'll take a 50 mile victory lap and then promptly put it up for sale. This truck is cursed. Betty, from beyond the grave, doesn't want anyone messing with her Blazer. Or maybe she's getting revenge for 30 years of shop visits with that thing.

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...