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2003 Trailbkazer U Codes
09-29-2012, 03:07 PM (This post was last modified: 09-29-2012 03:33 PM by citybilly.)
Post: #1
2003 Trailbkazer U Codes
hi I have a 2003 Chevy Trailblazer 4.2L I6 Automatic 4 Wheel Drive 90k miles the service engine light has came but it has codes we never seen or heard of it has code u1100 and u1162 not sure what either code means never seen a U CODE before as most engine codes begin P any help on this be appreciated
found what the code U1162 means Loss of Serial Communications for Class 2 Devices the U 1100 is DTC U1000 Class 2 Communication Malfunction We can pull up data stream on the code scanner. I suggested they check all the fuses any other ideas
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09-29-2012, 04:29 PM (This post was last modified: 09-29-2012 11:44 PM by Rupe.)
Post: #2
RE: 2003 Trailbkazer U Codes
Will have to do some research but the last time I ran across that communications error on a MOPAR it was a cracked solder joint on the back side of the dash cluster, which caused the security system to think someone was tampering so the engine would not stay running.

In your case I beliece the BCM is under the back seat so take a gander for anything obvious like physical damage, pinched wires, etc. I read on the web that a bad rear door module (for the locks?) can also throw some weird codes.
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09-29-2012, 07:37 PM (This post was last modified: 09-29-2012 07:44 PM by way2old.)
Post: #3
RE: 2003 Trailbkazer U Codes
On the U codes the last 3 digits are for the module. The U1162 is for the Liftgate Module. The U1000 is a lot more complicated. It moniters the modules and if it can not isentify a critical parameter within 5 seconds, the U1000 is set. Here are the modules monitored----

Audio Amplifier, BCM, HVAC Control Module, HVAC Control Module-Auxiliary, IPC, MSM-Driver, MSM-Passenger, PCM, Radio, SDM, TCSCM, VCIM, VTD

Being way2old is why I need help from younger minds.

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09-29-2012, 11:50 PM
Post: #4
RE: 2003 Trailbkazer U Codes
W2O put up a few good ideas so my figuring would be to check on what else is not working, especially on that nice list. Maybe he will spell out what some of those letters stand for.
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09-30-2012, 04:27 PM
Post: #5
RE: 2003 Trailbkazer U Codes
Ask and ye shall recieve: Smile
The audio amplifier
The body control module (BCM)
The driver door module (DDM)
The electronic brake control module (EBCM)
The front passenger door control module (FPDM)
The inflatable restraint sensing and diagnostic module (SDM)
The instrument panel cluster (IPC)
The HVAC control module
The HVAC control module-auxiliary
The liftgate control module (LGM)
The memory seat module-driver (MSMdriver)
The memory seat module-passenger (MSMpassenger)
The powertrain control module (PCM)
The transfer case shift control module (TCSCM)
The radio
The vehicle communication interface module (VCIM)
The theft deterrent control module (VTD)

Being way2old is why I need help from younger minds.

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10-07-2012, 11:13 AM
Post: #6
RE: 2003 Trailbkazer U Codes
Ok I was wandering something what is the practical purpose of the body control module. I get the engine computer that mainly came into play cause of emissions and fuel mileage regulations same thing with transmissions computers they have now and days. I get the Brakes. And Same with the Air Bag but I don't see any practical or useful purpose for the body computer. I was wandering why the manufacturers did this. We are still working on the trailblazer most likely were gonna take it too a dealer but ill let u guys know the final outcome.
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10-07-2012, 11:36 AM (This post was last modified: 10-07-2012 11:37 AM by Rupe.)
Post: #7
RE: 2003 Trailbkazer U Codes
The pracital reason for the BCM is to combine functions that would otherwise need many stand alone systems. In most cases it ties the remote door locks to the security system and lights, delays the radio shut down, delayed / auto head light function, interior lights, seat and mirror adjustment memory (if equipted) and similar, while being almost seemless to the user. On some vehicles it also remembers to turn off heated seats, rear defroster, and allows the wipers to park after the key is turned off. These days the odometer reading is also stored in there (digital dash functions) along with the VIN so each one is specifically programed to the car for it's features. There's quite a bit going on if you think about it, but most of this is for convenience.
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10-07-2012, 11:09 PM
Post: #8
RE: 2003 Trailbkazer U Codes
Well after more research we discovered that the previous owner of the trailblazer put too small of a battery in it. We went got a brand new battery and one that was right. And so far the check engine light has stayed off and it seems to even run better. Its been drove about 60 miles no check engine light will let you know if this is a permanent fix or not.
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10-10-2012, 11:17 PM
Post: #9
RE: 2003 Trailbkazer U Codes
The Battery didn't fix the issue all wires look fine being its the body control module we are gonna take it do the shop here where we live that handles electrical and computer end of the vehicle. Will let you guys know what they say
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10-10-2012, 11:33 PM
Post: #10
RE: 2003 Trailbkazer U Codes
Just a suggestion....

Keep in mind what accessories on the car do not work properly and if possible let them clear all of the codes then drive it for a few days to see what comes back. At least this way you will not be barking up the wrong tree due to fooling with things recently. (disconnected wires, etc) It will also help narrow it down to what's not working correctly right now.

If they tell you it needs a BCM you are almost stuck with buying a replacement then having it programed for the particular vehicle. They are not cheap and from what I hear it's hit or miss on using one from a junk yard, even if it's from the exact vehicle with the same accessories. Some of them contain both the VIN and the mileage and there may be a clash if it's not 100%.
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