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New Tsb Posted On Radios On Dec 16

Dontech

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Dontech Enthusiast

Dontech

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MY 2007 NBS has had a battery issue for over a year and the dealer can not figure out the problem. The truck will kill the battery for no obvious reason and at no set frequency. I have had the truck in to them multiple times and they have changed parts ranging from door locks, fuel pump relays, and a host of other do-hickies.

 

Yesterday the truck would not start again after work. This time I was told that a TSB was posted on Dec, 16 about the radios. They took the ser# off of my radio and said they would be in touch. Can any one get me a copy of that so I can read it for my self?

 

I am now past my 36000Mi warranty and am getting a little worried. The dealer did say they would continue to help, but it has been over a year and no fix. I am sure at some point they are going to cut ties……

 

Thanks for any help you guys can offer!

jrrod2004 Senior Enthusiast

jrrod2004

Posted
Posted
MY 2007 NBS has had a battery issue for over a year and the dealer can not figure out the problem. The truck will kill the battery for no obvious reason and at no set frequency. I have had the truck in to them multiple times and they have changed parts ranging from door locks, fuel pump relays, and a host of other do-hickies.

 

Yesterday the truck would not start again after work. This time I was told that a TSB was posted on Dec, 16 about the radios. They took the ser# off of my radio and said they would be in touch. Can any one get me a copy of that so I can read it for my self?

 

I am now past my 36000Mi warranty and am getting a little worried. The dealer did say they would continue to help, but it has been over a year and no fix. I am sure at some point they are going to cut ties……

 

Thanks for any help you guys can offer!

 

 

they usually start to cut ties 2 yrs/24K past the 3 yr/36K bumper to bumper warranty...have they done an overnight draw test???

Dontech Enthusiast

Dontech

Posted
  • Author
Posted
MY 2007 NBS has had a battery issue for over a year and the dealer can not figure out the problem. The truck will kill the battery for no obvious reason and at no set frequency. I have had the truck in to them multiple times and they have changed parts ranging from door locks, fuel pump relays, and a host of other do-hickies.

 

Yesterday the truck would not start again after work. This time I was told that a TSB was posted on Dec, 16 about the radios. They took the ser# off of my radio and said they would be in touch. Can any one get me a copy of that so I can read it for my self?

 

I am now past my 36000Mi warranty and am getting a little worried. The dealer did say they would continue to help, but it has been over a year and no fix. I am sure at some point they are going to cut ties……

 

Thanks for any help you guys can offer!

 

 

they usually start to cut ties 2 yrs/24K past the 3 yr/36K bumper to bumper warranty...have they done an overnight draw test???

 

 

They have had the over night many times, they even had it all weekend last month. I was told they could not find any current pull. That was when they replaced the fuel pump relay.

jrrod2004 Senior Enthusiast

jrrod2004

Posted
Posted
They have had the over night many times, they even had it all weekend last month. I was told they could not find any current pull. That was when they replaced the fuel pump relay.

 

 

 

 

I guess a stupid question, have they checked the charging system under load? is the truck charging as you are going down the road? I know that these trucks do not charge continously, you either have to be in tow/haul mode or have the headlights on for the truck to remain in the charging mode. Rich (MS3DALE) once told me about this...perhaps the truck is 'dead' while you are driving it and does not restart because it did not charge as you were going down the road...my question is how many times have they charged/changed the battery itself???

jfm1982 Enthusiast

jfm1982

Posted
Posted

my truck has the same problem. I wake up the next morring the truck is dead. It have been in the shop 4 times for this problem. They never find anything. They said they tried every possible test out there.

jrrod2004 Senior Enthusiast

jrrod2004

Posted
Posted

then I would say it is a grounding issue (if the truck tends to die). there is gotta be some condition that does not allow it to charge or keep its charge...might not be a parastic draw in terms of power, but it might be something shorting out (not good)...

pm26 Senior Enthusiast

pm26

Posted
Posted

I had a weird problem with my boat several years ago. This boat has an automotive type engine (Ford 302 cu in EFI V8). It turned out that the battery was being drained right through the alternator to the ground. I assume bad diodes, or something like that. After boat sat for several days with a fully charged battery, it would not start. After I changed the alternator , I can leave the boat sit for two months with the battery connected and it will start.

 

What was weird was that I had the bad alternator bench tested and it was putting out correct amps at correct voltage. But something inside was cuasing the battery to bleed down right through the alternator. Go figure.

 

An interim solution is to install a battery negative terminal cut off switch so you can quickly disconnect the battery when you let the truck sit overnight.

 

If you suspect that the radio is bleeding down the battery, remove the radio fuse and see what happens.

jfm1982 Enthusiast

jfm1982

Posted
Posted

Well it happend to me monday (truck was dead) The time before that was last march. It just happends out of the blue. The truck has been parked 2 days and it started right up tonight

jrrod2004 Senior Enthusiast

jrrod2004

Posted
Posted

I would say to replace the alternator (regardless if it is under warranty) as it might save you headaches down the road

Zembonez Senior Enthusiast

Zembonez

Posted
Posted
Well it happend to me monday (truck was dead) The time before that was last march. It just happends out of the blue. The truck has been parked 2 days and it started right up tonight

MAN... something that intermittent sounds like a relay or something staying on. Really strange. That has to be a pain trying to figure it out.

jrrod2004 Senior Enthusiast

jrrod2004

Posted
Posted
Well it happend to me monday (truck was dead) The time before that was last march. It just happends out of the blue. The truck has been parked 2 days and it started right up tonight

MAN... something that intermittent sounds like a relay or something staying on. Really strange. That has to be a pain trying to figure it out.

 

 

yeah but wouldnt the relay show a parasitic draw??? I would eliminate the components one by one. pull all of the fuses for the radio, HVAC unit, Onstar (if equipped) and any other accessory that you may have (Homelink, GPS, etc). then drive around and see if the truck dies on you...dealership does not want to do any of that mess because they would not get paid by the warranty claim. If the truck stays alive, then I would progressively swap component fuses to see if one of them causes the truck to die

jrrod2004 Senior Enthusiast

jrrod2004

Posted
Posted
Well it happend to me monday (truck was dead) The time before that was last march. It just happends out of the blue. The truck has been parked 2 days and it started right up tonight

 

depending on time/mileage limits, you probably would push for repurchase if they cannot get the issue resolved, otherwise you are stuck like chuck

Zembonez Senior Enthusiast

Zembonez

Posted
Posted
Well it happend to me monday (truck was dead) The time before that was last march. It just happends out of the blue. The truck has been parked 2 days and it started right up tonight

MAN... something that intermittent sounds like a relay or something staying on. Really strange. That has to be a pain trying to figure it out.

 

 

yeah but wouldnt the relay show a parasitic draw??? I would eliminate the components one by one. pull all of the fuses for the radio, HVAC unit, Onstar (if equipped) and any other accessory that you may have (Homelink, GPS, etc). then drive around and see if the truck dies on you...dealership does not want to do any of that mess because they would not get paid by the warranty claim. If the truck stays alive, then I would progressively swap component fuses to see if one of them causes the truck to die

 

NOT if it is only sticking occasionally. The only time it would show up is if they happened to run a test WHILE it was sticking. Completely unrelated but I once had an employee with a Nissan 300ZX. About once a month or so it would continue pumping fuel after he shut it off and when he went out to start it the next time it was flooded. Turned out to be a fuel pump relay that was sticking in the on position but only every so often. It was a hair puller but the relay fixed it once he tried a new one. Either that or the problem just went away. I thought a relay might be sticking and draining the battery in this case. It is however just a guess.

jrrod2004 Senior Enthusiast

jrrod2004

Posted
Posted
NOT if it is only sticking occasionally. The only time it would show up is if they happened to run a test WHILE it was sticking. Completely unrelated but I once had an employee with a Nissan 300ZX. About once a month or so it would continue pumping fuel after he shut it off and when he went out to start it the next time it was flooded. Turned out to be a fuel pump relay that was sticking in the on position but only every so often. It was a hair puller but the relay fixed it once he tried a new one. Either that or the problem just went away. I thought a relay might be sticking and draining the battery in this case. It is however just a guess.

 

 

Not necessarily a guess, perhaps it is a relay (which would suck since these trucks have TONS of relays nowadays)...I would say for him to see about getting a recording device to record if there is any change at night and what power is being pulled (if any) and just do it all himself

pm26 Senior Enthusiast

pm26

Posted
Posted

I left a map light on in my car all night several times and it did not drain (or seemingly even weaken) the battery. In order for this to happen, the draw must be substantial - a device that draws a lot of current, such as seat heaters, rear window defroster, etc.

 

I would also recommend load testing the battery. You never know, the battery itself could be the problem. There could be a batch of bad batteries. This would be a very easy, relatively inexpensive fix. Always start with the most obvious. A bad battery will lose its charge very quickly - it will fully charge and hold the voltage, but will have very limited reserve capacity. This is exactly what happens to batteries here in Florida when they are about thee years old. Which means that my truck is ready for a new battery even though the old one works good. But they fail very unexpectedly and without warning sometimes. This happens mostly due to high temperature and humidity and accelerated sulfation of the lead plates.

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