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Discussion Starter #1
I've had a tire pressure monitor system (TPMS) problem for months (separate thread). My Chevy service center changed the body control module today. I'm hopeful that the problem is now solved.

About 10 days ago I first noticed a horrible rattling sound from the engine. I eventually realized it was happening as the AFM switched from V4 to V8 (generally when going from coasting to pushing the accelerator pedal gently). I suspected it was from improper belt tension. Today they changed the belt tensioner. I haven't heard the noise during subsequent driving.

About a week ago, my infotainment screen became unstable. It looked a TV set from the 1950's with vertical control out of whack. It would also go completely dark at times. Today they did a software update. It has been stable so far.

I love my night race blue Stingray convertible but these issues had taken the fun out of driving it. I hope they are now solved so I can completely enjoy the driving experience again.
 

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Hopefully they are now all sorted out. I think I recall that yours is a non-Z51, is that correct wcjulyan?
 

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Discussion Starter #4
Hopefully they are now all sorted out. I think I recall that yours is a non-Z51, is that correct wcjulyan?
Yes, it is a non-Z51. I drove it some more today. The engine noise is gone (the belt-tensioner seems to have taken care of that). The Infotainment display seems OK. But I did get a TPMS warning, same as before, no pressure indication for the right front. It returned to normal after a few miles of driving, but I don't think the issue is solved.
 

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wc; Keep us posted on your progress. The belt tensioner continues to be problematic on this car. To my knowledge the part has not been changed / redesigned. If the part no. for your replaced tensioner is listed on you repair ticket please add it to your post. As a side note: How much time (ballpark) did you / do you spend in the V-4 mode?
 

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wc; Keep us posted on your progress. The belt tensioner continues to be problematic on this car. To my knowledge the part has not been changed / redesigned. If the part no. for your replaced tensioner is listed on you repair ticket please add it to your post. As a side note: How much time (ballpark) did you / do you spend in the V-4 mode?
The repair invoice shows 12658273 for the belt tensioner. I don't really know how much time I spend in V4, probably not much during my local city driving. I first noticed the noise when driving on the Blue Ridge Parkway in North Carolina, which involved lots of transitions from coasting to adding power as we dipped and climbed through the mountains.
 

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Thanks, that is the same number / part that has been used for many months. Did you also see hyd. fluid pooled under your car or find oil on the front under-hood area, or was the noise the only thing you noticed?
 

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Discussion Starter #8
Thanks, that is the same number / part that has been used for many months. Did you also see hyd. fluid pooled under your car or find oil on the front under-hood area, or was the noise the only thing you noticed?
I did not see any pooled hydraulic fluid or find oil under the hood, just heard the noise.
 

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wcjulyan, Is everything squared away now? I've had a couple problems myself and they were all corrected. Hope all goes well with your C7 and you get back to wheeling it around GA.

SF
Rick
 

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Discussion Starter #10
wcjulyan, Is everything squared away now? I've had a couple problems myself and they were all corrected. Hope all goes well with your C7 and you get back to wheeling it around GA.

SF
Rick
I still have a problem with false TPMS warnings. It's always the RF tire that shows no pressure. It eventually starts working again then goes out again. I don't know why GM and my local Chevy dealer can't fix it, but it's been going on for more than 3 months.
 

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The repair invoice shows 12658273 for the belt tensioner. I don't really know how much time I spend in V4, probably not much during my local city driving. I first noticed the noise when driving on the Blue Ridge Parkway in North Carolina, which involved lots of transitions from coasting to adding power as we dipped and climbed through the mountains.
There seems to be a correlation between belt tensioner failure and cylinder de-activation. That's why I never use the AFM just to get an extra 1-2 mpg. It would be interesting to know how many others out there never use AFM and whether they have had belt tensioner failure.
:cool:
 

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Discussion Starter #12
There seems to be a correlation between belt tensioner failure and cylinder de-activation. That's why I never use the AFM just to get an extra 1-2 mpg. It would be interesting to know how many others out there never use AFM and whether they have had belt tensioner failure.
:cool:
How do you turn off AFM?
 

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Now two of my three issues have returned. The TPMS false warnings and the infotainment screen. Three times in less than an hour of local driving this morning, the infortainment screen flickered and then went dark. It comes back on again after about 5 minutes or so. I drove Japanese cars for decades after getting lemons from Ford in the 70s. The local Chevy service center is booked for the next 10 days; if all GM cars have as many nagging problems as my Stingray, I can understand why. I should have kept my Infiniti convertible.
 

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wc; I think you will find that the two issues that are still active will be fixed by a screen replacement and possibly the ecm's that feed it. Do you know what was done to repair these issues the last time it was in aside from the module replacement? Re-flash?
 

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Now two of my three issues have returned. The TPMS false warnings and the infotainment screen. Three times in less than an hour of local driving this morning, the infortainment screen flickered and then went dark. It comes back on again after about 5 minutes or so. I drove Japanese cars for decades after getting lemons from Ford in the 70s. The local Chevy service center is booked for the next 10 days; if all GM cars have as many nagging problems as my Stingray, I can understand why. I should have kept my Infiniti convertible.
I suggest you avail yourself of the expediting efforts our our customer support team by PMing them [ChevroletCustomerCare] to hopefully get your issues resolved.
 

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Discussion Starter #16 (Edited)
wc; I think you will find that the two issues that are still active will be fixed by a screen replacement and possibly the ecm's that feed it. Do you know what was done to repair these issues the last time it was in aside from the module replacement? Re-flash?
The service center doesn't seem to want suggestions from me about what might actually fix the problems. The service advisor has their Corvette mechanic call GM. So far that hasn't worked except to waste their time and mine. I have suggested several times that they replace the receiver to fix the TPMS problem, but the service advisor is convinced that it couldn't possibly be the receiver.

Last time they replaced the body control module (to attempt to fix the TPMS...it didn't) and reprogrammed the infotainment display (which also didn't fix the screen flickering then going dark).
 

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The service center doesn't seem to want suggestions from me about what might actually fix the problems. The service manager has their Corvette mechanic call GM. So far that hasn't worked except to waste their time and mine.
Go to a different dealership.
 

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Drive by two Chevy dealerships to get to one, 38 miles away, that is FANTASTIC. Every single service visit to my current dealer has been exemplary.

We shop around for restaurants, some folks try different jobs before they find the right fit, many of us dated quite of few folks before we found the right one, yet curious as to folks not shopping around for service dealerships. I say that as I have heard for years and years, that many folks not happy with their local service department, but are unwilling to go further to get to a great one.

For most of us, our Corvettes are our second or third biggest expenditure, yet somehow, it becomes overwhelming to even consider going further, to drive to another dealership to get super service.
 
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