07 Silverado Crew - Electronic nightmare!
Oct 7, 2007 | 08:46 AM
#11
On The Tree
Joined: Apr 2003
Posts: 172
Likes: 0
From: Md.
My dad has been having a similar problem with his NNBS 07 CC. For some reason his will just stop charging and the battery will completely run down. Then it will work for a while, then stop working.... The dealer can't find anything wrong with the battery or the alternator..... His has 2300 miles on it and it has been back to the dealer 4 times....
Maybe one of the our members who work at the dealerships can chime in and give some more insight.
Oct 10, 2007 | 10:04 PM
#13
Teching In
Joined: Jul 2007
Posts: 47
Likes: 0
From: Kilgore, TX
I have not heard of the blinkers and other items but the radio clock resetting is a known problem to gm. Mine does it and there is a known condition by gm the last i looked a few weeks ago it still said that engineering was working on a solution i believe it said "an update". I will try to remember to look tomorrow and post a response.
Oct 11, 2007 | 10:44 AM
#15
Teching In
Joined: Jul 2007
Posts: 47
Likes: 0
From: Kilgore, TX
Document ID# 2022581
2007 GMC Truck Sierra - 2WD
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Subject: Radio Clock Intermittently Resets - keywords ground power start UM7 UC1 up wire #PIT4470A - (10/02/2007)
Models: 2007-2008 Chevrolet Silverado
2008 Chevrolet Express
2007-2008 GMC Sierra
2008 GMC Savanna
with RPO UM7 or UC1
--------------------------------------------------------------------------------
This PI was superseded to update Recommendation/Instructions. Please discard PIT4470.
--------------------------------------------------------------------------------
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
Some customers may comment of the radio clock resetting to 12:00 on the UM7 or UC1 radio. This concern may be very intermittent and difficult to duplicate.
Recommendation/Instructions:
To correct this concern, reprogram the radio with updated calibration released to TIS2WEB on October 1, 2007 or later. As always, make sure your Tech 2® is updated with the latest software version.
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
2007 GMC Truck Sierra - 2WD
--------------------------------------------------------------------------------
Subject: Radio Clock Intermittently Resets - keywords ground power start UM7 UC1 up wire #PIT4470A - (10/02/2007)
Models: 2007-2008 Chevrolet Silverado
2008 Chevrolet Express
2007-2008 GMC Sierra
2008 GMC Savanna
with RPO UM7 or UC1
--------------------------------------------------------------------------------
This PI was superseded to update Recommendation/Instructions. Please discard PIT4470.
--------------------------------------------------------------------------------
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
Some customers may comment of the radio clock resetting to 12:00 on the UM7 or UC1 radio. This concern may be very intermittent and difficult to duplicate.
Recommendation/Instructions:
To correct this concern, reprogram the radio with updated calibration released to TIS2WEB on October 1, 2007 or later. As always, make sure your Tech 2® is updated with the latest software version.
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
Oct 12, 2007 | 06:24 PM
#16
Joined: Oct 2004
Posts: 4,985
Likes: 54
From: somewhere in TX
I had a problem with a new body style tahoe that had an inoperative lift gate glass and rear defroster and after much hair pulling it turned out to be the underhood fuseblock. After we replaced it, after finally catching it acting up everything has been fine for over a month.
Oct 16, 2007 | 08:03 PM
#17
Launching!
Joined: Sep 2007
Posts: 211
Likes: 0
From: Cali
in 2005 i bought a 05 chevy colorado xtreme and it was doing the same things your mentioning about the radio resetting i thought that was the only problem but it turned into others: my power windows went out the day i drove the truck HOME from the dealerlot just all kinds of crazy stuff they speedometer stopped working and stopped adding trip miles it was stuck at like 700 so i took it to them they replaced the radio and the cluster but as soon as i hit the freeway the truck was at it again speedo stopped so the next day i took the truck in and they allowed me to swap it for any vehicle on the chevy lot 30gs and under so i did and bought a 05 silverado and thats the truck i have to this day i love it but man go get your money back threaten to sue cuz u have a lemon just like i did - - hurry cuz ur statue of limitation is running out as soon as i told them i was about to letigate they gave me a deal to go trade a 20g truck in for a 30g truck they knew they were in the wrong tottally for selling a lemon -
Hey guys, I'm a regular at www.ls1tech.com - but recently traded my 04 silverado on a 07 (new body style) with the am/fm - cd xm stereo unit.
About a week after I got the truck the clock starting resetting to 12 on its own, then the radio would drop out. When the radio drops out there is no display at all AND the blinkers won't make the click noise. The onstar and phone goes out too when this happens. It will then just cycle back on - sometimes not at all when I am driving - but of course it will within a block from the dealer as I bring it in.
It seems to cycle on for about 3.5 hours (I can tell by the time on the clock) then drops out.
Dealer has replaced the radio 1x
BCM 1x
checked all grounds and connections
It is in the shop now to replace the radio again ??????
There is a software problem with one of the other radios - but not this one.
I only have 600 miles on the truck and have owned for only 3 weeks.
I seriously doubt another radio swap will fix it.
I love this truck - and there is no way they will replace it over this problem - but I am frustrated.
Anybody hear of this? Any tips or tricks to fix? The dealer is desperate too as they are being told by GM that even GM doesn 't know what it is.
About a week after I got the truck the clock starting resetting to 12 on its own, then the radio would drop out. When the radio drops out there is no display at all AND the blinkers won't make the click noise. The onstar and phone goes out too when this happens. It will then just cycle back on - sometimes not at all when I am driving - but of course it will within a block from the dealer as I bring it in.
It seems to cycle on for about 3.5 hours (I can tell by the time on the clock) then drops out.
Dealer has replaced the radio 1x
BCM 1x
checked all grounds and connections
It is in the shop now to replace the radio again ??????
There is a software problem with one of the other radios - but not this one.
I only have 600 miles on the truck and have owned for only 3 weeks.
I seriously doubt another radio swap will fix it.
I love this truck - and there is no way they will replace it over this problem - but I am frustrated.
Anybody hear of this? Any tips or tricks to fix? The dealer is desperate too as they are being told by GM that even GM doesn 't know what it is.
Oct 17, 2007 | 07:00 PM
#20
GM's newer fuse blocks have had issues with opens in the circuit boards ever since they came out, they are really tricky to diagnose because they are non-servicable items, which means we cant tear them apart to see whats goin on inside of them without destroying the block.
