Jump to content

noise 4hi sierra 2020

Dr BLOTO
 Share

Recommended Posts

fatwhiteboy Enthusiast

fatwhiteboy

Posted
Posted (edited)
19 hours ago, Dr BLOTO said:

Hello
 I get a sound when I turn on 4HI mode. I went to the dealer more than once and they told me that this is normal
But I was not convinced because the sound is very annoying
Is there any idea or person who appears to him such a sound

 

Hello Doc.  I can't hear your noise but mine chirps in 2 wheel high.  All wheel mode and 4 wheel is completely goes away.  There is a bulletin for this and my dealer stated that I was the first to complain about it, imagine that.  The Bulletin No.: PIP5653E states exactly what mine is doing.  If yours sounds anything like a chirp or a grind and it goes away when you press the AWD or 4W button, it is probably the same.  At this point, I have the extended warrantee and am waiting for something else to break before I have the repair this.  If your sound is different look for a bulletin, they will not send it to you, you have to bring it to them.

MC-10173724-9999.pdf

Edited by fatwhiteboy
Z45 Senior Enthusiast

Z45

Posted
Posted

I do not hear anything.   When operating in 4Hi there are more gears turning, rear axle, transfer case and front axle so some amount of noise it to be expected and it will likely increase/decrease with speed and road conditione.   The tires can also contribute to more noise especially if they are oversize and aggressive tread.   I have driven all makes and owned a GM 4wd truck since the mid 1980's.  The fact that I cannot hear anything abnormal in your video makes me side with the dealer. 

 

Is this your 1st4wd drive truck?

Gangly Senior Enthusiast

Gangly

Posted
Posted

I hear an occasional whine in the video that my truck definitely does not have.  If that's what you are referring to, then I don't think that's normal.

Dr BLOTO New Member

Dr BLOTO

Posted
  • Author
Posted
On 7/4/2023 at 10:19 PM, fatwhiteboy said:

Hello Doc.  I can't hear your noise but mine chirps in 2 wheel high.  All wheel mode and 4 wheel is completely goes away.  There is a bulletin for this and my dealer stated that I was the first to complain about it, imagine that.  The Bulletin No.: PIP5653E states exactly what mine is doing.  If yours sounds anything like a chirp or a grind and it goes away when you press the AWD or 4W button, it is probably the same.  At this point, I have the extended warrantee and am waiting for something else to break before I have the repair this.  If your sound is different look for a bulletin, they will not send it to you, you have to bring it to them.

MC-10173724-9999.pdf 97.3 kB · 4 downloads

No, the sound appears when I turn on the 4HI mode
It also shows noise on 2HI at high speeds

Dr BLOTO New Member

Dr BLOTO

Posted
  • Author
Posted
On 7/5/2023 at 5:02 PM, elcamino said:

I do not hear anything.   When operating in 4Hi there are more gears turning, rear axle, transfer case and front axle so some amount of noise it to be expected and it will likely increase/decrease with speed and road conditione.   The tires can also contribute to more noise especially if they are oversize and aggressive tread.   I have driven all makes and owned a GM 4wd truck since the mid 1980's.  The fact that I cannot hear anything abnormal in your video makes me side with the dealer. 

 

Is this your 1st4wd drive truck?

No, it's not the first four-wheel drive car
When purchased this noise was not audible
And I had such a car, but the 2016 model also did not make such a noise

Dr BLOTO New Member

Dr BLOTO

Posted
  • Author
Posted
23 hours ago, Gangly said:

I hear an occasional whine in the video that my truck definitely does not have.  If that's what you are referring to, then I don't think that's normal.

Yes, that's what I mean
It appears clearly when the load on one of the wheels

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

    • SFC Retired
      2023 DRW Wheel Liners

      By SFC Retired · Posted

      Did have to make 1 modification because of the WeatherTech rear mud flaps and that was needing 3 longer screws than what came with the install package. 😄
    • SFC Retired
      2023 DRW Wheel Liners

      By SFC Retired · Posted

      Picked up the liners yesterday. Installed passenger side WITHOUT any modifications. All mounting holes lined up perfectly. Rain is interfering today with drivers side. Very Happy! Will add pics when finished
    • KARNUT
      OCI, not when but why?

      By KARNUT · Posted

      As a matter of amusement I’ll leave this conversation with this. Do you beat the government average fuel estimate? Statistics are a guide to me. Not a rule. Someone once said I have to have the last word. If true and possible may be. I’ll blame that on working in a family business.
    • bluev8
      Intermittent no-code issues on 2022.5+ V8 trucks — what did the shop fail to capture?

      By bluev8 · Posted

      That is a fair point, and I agree that trying to log “everything in the truck” would be the wrong direction.   There are a lot of modules and a lot of traffic. If the product became a full-truck datalogger, the amount of data would get huge very quickly, and most owners would never use it.   I think the first useful version would need to be narrow: - powertrain-side event evidence - selected high-value parameters - communication / voltage / reset events - pre/post event window - short report first, raw log only as backup   One distinction I should make is between active OBD/PID polling and passive bus capture. If you are polling PIDs through OBD, then yes: the more parameters you request, the lower the effective sample rate becomes, and you are adding diagnostic traffic to a vehicle that is already busy running itself. With passive CAN capture, the recorder is not asking all the modules for data. It is listening to traffic that is already on the bus. So it does not consume vehicle bus bandwidth in the same way that a scan tool polling hundreds of PIDs would. But your point still applies in a different way.   Even if passive capture does not add bus traffic, the recorder still has limits: - processing rate - storage rate - timestamp accuracy - decoder workload - event filtering - report size - user attention span   So the answer cannot be “log everything and let the user figure it out.” The product would need to store enough raw evidence to be useful, but only decode, graph, and present the important parts around the event.   A practical report should probably show: - what triggered the capture - how much pre/post data was preserved - which selected parameters changed - how those values compared to baseline - whether the same pattern happened before - whether any voltage, reset, bus-off, lost-message, or communication fault occurred - selected graphs around the event - raw data only as supporting evidence   So I agree with you. More data is not automatically better. The real product is the reduction from raw data into a useful event report.
    • bluev8
      Intermittent no-code issues on 2022.5+ V8 trucks — what did the shop fail to capture?

      By bluev8 · Posted

      That makes sense, and I agree with most of that.   I think the product would need both: 1. a default powertrain template, so it is useful out of the box; 2. user-selected priority parameters, so the owner or shop can choose what they want to see first.   Different users are going to care about different things. One owner may care about oil pressure and voltage. Another may care about misfire trend, AFM/DFM behavior, or U-codes. A shop may want communication events and repeatability first. Your baseline point is probably the most important one. Raw data is not very useful unless the report can show what normal looked like for that vehicle under similar conditions.   The way I would think about it is: - start with a basic known-good baseline - learn normal behavior for that specific vehicle over time - allow the event to be overlaid against baseline - show whether the event was a one-time spike or a repeatable pattern - provide a simple severity level, but with clear limits on what that severity means   For example, early severity could be something like: - Info: event captured, no obvious abnormal pattern - Watch: value moved outside baseline, but not repeated - Warning: repeatable abnormal pattern under similar conditions - Critical: communication loss, voltage drop, bus-off, reset, or severe repeated event   I would not want the first version to say “replace this part.” That would be overclaiming unless there is repair-confirmed data behind it. It would be more honest to say “this pattern deserves inspection.”   On the OBD port question, I think OBD absolutely has a role. OBD is probably the right place for: - DTCs - freeze frame - VIN - calibration information - normal scan-tool parameters - Mode 6 / enhanced diagnostic data if available The reason I am still looking at an ECM-side recorder is that the failure may happen before anyone connects a scan tool. If the owner plugs in a scanner after the event, the pre-event evidence may already be gone unless the ECU happened to save it. So I do not see this as “OBD versus ECM-side.” I see it more like: - ECM-side recorder: always armed, rolling buffer, event evidence - OBD/DLC companion: DTCs, freeze frame, VIN, calibration, normal scan data - phone/cloud: status, notes, upload, report generation, notifications   I agree that phone connection and push notifications would be useful. I just would not want the phone or cloud connection to be required for capture. The recorder should save the event locally even if the phone is not connected. The phone should help with event marking, download, notes, upload, alerts, and report viewing.   For a default GM V8 event report, would this list make sense? - RPM - calculated load / MAP - throttle position - vehicle speed - gear / torque converter state if available - coolant temperature - oil pressure - oil temperature if available - battery voltage - commanded AFM/DFM state if available - actual AFM/DFM state if available - misfire counters / roughness by cylinder if available - fuel trims - relevant U-codes / communication events - bus-off / lost periodic message / module reset / voltage drop events Which of those would you remove, and what would you add?

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...