docsol Posted November 1, 2016 Share Posted November 1, 2016 Here is the scenario. 2014 Silverado 1500 with 99,000 +/- miles on it taken to the dealer. Code shows oil pump. Mechanic takes the oil pan off and sees a lot of metal. Technician tears the engine down and GM denies warranty claim stating the Vacuum pump disintegrated and that led to the engine failure. Vacuum pump was only warrantied to 36,000 miles. I'm no a mechanic, but how in the world can a vacuum pump cause an engine to fail?? Thoughts? Link to comment Share on other sites More sharing options...
newdude Posted November 1, 2016 Share Posted November 1, 2016 Engine oil does lubricate the vacuum pump. If the pump let go, it could have started pumping metal debris back into the oil/lubrication system thus taking out the oil pump. The vacuum pump is bolted right to the driver's side of the engine block where it receives it's feed of engine oil. We've seen trucks with bad vac. pumps. They sound like a bad lifter tick when they start making noise, and they can start to pump engine oil into the brake booster lines from the vac. pump. If the tech had a sharp pencil, he could have tried to right that up as the oil pump failed, and then as a result of the pump failing, took out the vac. pump. GM might have still shot that down as well though. Unfortunately, its too late to sharpen that pencil up. Might not hurt to contact GM customer assistance and see if they can get a case opened and possibly lead to splitting repair costs with you seeing as a part that is lubricated by the powertrain (which the powertrain is still under warranty) took out the warrantied powertrain item. Link to comment Share on other sites More sharing options...
O_J_Simpson Posted November 1, 2016 Share Posted November 1, 2016 You skipped the most important step in major warranty claims. Always slip the tech a bottle of Crown before the tear down. Good things will happen on that $30 investment. Link to comment Share on other sites More sharing options...
MikeNH Posted November 1, 2016 Share Posted November 1, 2016 That's such crap. Start contacting the customer service and complain on their social media pages, that sort of thing usually helps reach the right people. I'd be livid if they tried to back out of a warranty claim on something that is clearly on them. Link to comment Share on other sites More sharing options...
Haus_Z71 Posted November 2, 2016 Share Posted November 2, 2016 That's such crap. Start contacting the customer service and complain on their social media pages, that sort of thing usually helps reach the right people. I'd be livid if they tried to back out of a warranty claim on something that is clearly on them. I check in to GMC's Facebook page quite often. A lot of people would complain there and a rep would reach out to them. However, very recently they just turned off visitor comments! You can no longer leave any comment there. I'm Link to comment Share on other sites More sharing options...
Nathan79 Posted November 2, 2016 Share Posted November 2, 2016 Write a letter to the CEO. That's crazy. Link to comment Share on other sites More sharing options...
GMC2015 Posted November 2, 2016 Share Posted November 2, 2016 WOW! That's just messed up. So what's the point of the engine warranty if my vacuum pump fails past 36,000 miles? Please tell me you aren't accepting this at all... Link to comment Share on other sites More sharing options...
BigBadSierra Posted November 2, 2016 Share Posted November 2, 2016 I would be filing a claim with GM and fighting this one. Link to comment Share on other sites More sharing options...
docsol Posted November 2, 2016 Author Share Posted November 2, 2016 Thanks all for the feedback. Issue isn't dead. Link to comment Share on other sites More sharing options...
KUUG Posted January 31, 2017 Share Posted January 31, 2017 Did you get your issue resolved? What motor do you have? I took mine in last week, 2014 5.3 with 73,XXX miles. Same exact issue, they said it was a couple other things and then ended up finding out it was in fact the oil pump. They dropped the pan today and found shavings. GM has approve to tear into the motor; I was told that they will be rebuilding the motor and possibly getting a new block. Just got the news today so we will see what they find. Link to comment Share on other sites More sharing options...
docsol Posted January 31, 2017 Author Share Posted January 31, 2017 Did you get your issue resolved? What motor do you have? I took mine in last week, 2014 5.3 with 73,XXX miles. Same exact issue, they said it was a couple other things and then ended up finding out it was in fact the oil pump. They dropped the pan today and found shavings. GM has approve to tear into the motor; I was told that they will be rebuilding the motor and possibly getting a new block. Just got the news today so we will see what they find. Same year and engine as yours. GM denied the warranty but they have a "Customer Assistance" program they offered and replaced the motor. I had to pay some cash which was about the same as what I was going to shell out for a 100,000 mile service. All in all I was satisfied. Link to comment Share on other sites More sharing options...
Sierra 5.3 Posted January 31, 2017 Share Posted January 31, 2017 I check in to GMC's Facebook page quite often. A lot of people would complain there and a rep would reach out to them. However, very recently they just turned off visitor comments! You can no longer leave any comment there. I'm Tag them in posts. Use Twitter and any other social media. The more media presence you get the more inclined they are to stop the compliant and fix it. Link to comment Share on other sites More sharing options...
15_silverado Posted February 1, 2017 Share Posted February 1, 2017 Others have said the vacuum pump is only needed when the truck is in V4 mode to compensate for the lack of vacuum needed for the brake booster when in V4 mode. If you have AFM tuned out; running in V8 mode all the time, you can safely delete the vacuum pump. Well with seeing all this BS I would like to delete the vacuum pump. Questions, Does the pump run all the time regardless of what mode your in; V4 or V8? If it's only active/running in V4 mode, and you had AFM disabled; running V8 all the time, would you be in no risk of the pump being able to grenade and cause debri going into the engine oil, causing engine failure? Or could the pump still grenade even if you were running in V8 mode all the time? If so, what is necessary to delete the pump? Are there already vacuum lines in place for running in V8 mode? Link to comment Share on other sites More sharing options...
docsol Posted February 1, 2017 Author Share Posted February 1, 2017 Others have said the vacuum pump is only needed when the truck is in V4 mode to compensate for the lack of vacuum needed for the brake booster when in V4 mode. If you have AFM tuned out; running in V8 mode all the time, you can safely delete the vacuum pump. Well with seeing all this BS I would like to delete the vacuum pump. Questions, Does the pump run all the time regardless of what mode your in; V4 or V8? If it's only active/running in V4 mode, and you had AFM disabled; running V8 all the time, would you be in no risk of the pump being able to grenade and cause debri going into the engine oil, causing engine failure? Or could the pump still grenade even if you were running in V8 mode all the time? If so, what is necessary to delete the pump? Are there already vacuum lines in place for running in V8 mode? The pump runs all the time. I had a gander at the pump when the mechanic tore it down. There is what appears to be a part that looks like a large tongue depressor (don't know how else to describe it) that spins inside the housing. In my case, it appeared that the spinning object ate away the inside of the housing resulting in metal shavings being deposited in the oil. Link to comment Share on other sites More sharing options...
newdude Posted February 1, 2017 Share Posted February 1, 2017 Others have said the vacuum pump is only needed when the truck is in V4 mode to compensate for the lack of vacuum needed for the brake booster when in V4 mode. If you have AFM tuned out; running in V8 mode all the time, you can safely delete the vacuum pump. Well with seeing all this BS I would like to delete the vacuum pump. Questions, Does the pump run all the time regardless of what mode your in; V4 or V8? If it's only active/running in V4 mode, and you had AFM disabled; running V8 all the time, would you be in no risk of the pump being able to grenade and cause debri going into the engine oil, causing engine failure? Or could the pump still grenade even if you were running in V8 mode all the time? If so, what is necessary to delete the pump? Are there already vacuum lines in place for running in V8 mode? Its bolted to the engine block and has oil fed to it. Not exactly easy to delete. Pump could fail V4 or V8 as its running all the time and is driven off of its own belt via the crankshaft. Link to comment Share on other sites More sharing options...
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