Hey all


Got in my truck this AM for the obligatory daily shuttle and noticed a red LED on my mirror where all the OnStar crap is. Hmm. Hit the OnStar button and they did the "remote diagnostic" thing, which is nice I must say.


At any rate, I was told that there was one error code in the truck a "U1003", which I was told was not critical but I need to take the truck in for service at my convenience.


My question is this: What is a "U1003" error code?


Thanks in advance!

It is a communication code of some sort. It is not getting proper communication from something. I am looking.

this all i found?



<TABLE cellSpacing=0 cellPadding=4 width="90%" align=center>
<T>
<TR>
<TD vAlign=top align=middle>
< =codes.asp method=post>Enter DTC: < size=15 value=u1003 name=DTC>
< =submit value="LookUp DTC Ination"> </></TD></TR>
<TR>
<TD vAlign=top>
<HR id=StartList width="100%" color=#000000 SIZE=2>

Occasionally, vehicle manufacturers will use the same DTC across different vehicles and platforms. If the DTC that you entered above returns more than one DTC description below, you will need to match certain digits of your VIN to determine which DTC description applies to your vehicle.
For example:You have a General Motors vehicle and the Diagnostic Trouble Code is B0566.
<UL>
<LI>If the third digit in your VIN is a "1", your DTC means Infl Rest System Indicator Circuit Malf.
<LI>If the third digit is a "2", the DTC means Temp. Gage Data Out of Range </LI>[/list]
<HR id=StartList width="100%" color=#000000 SIZE=2>

<TABLE width="100%" align=center border=1>
<T>
<TR>
<TD rowSpan=2>DTC</TD>
<TD rowSpan=2>Description</TD>
<TD align=middle colSpan=6>VIN Digits</TD></TR>
<TR>
<TD align=middle>2
Manufacturer</TD>
<TD align=middle>3
Division</TD>
<TD align=middle>4
Body</TD>
<TD align=middle>5
Series</TD>
<TD align=middle>8
Engine</TD>
<TD align=middle>10
Year</TD></TR>
<TR>
<TD vAlign=top>U1003</TD>
<TD vAlign=top>Loss of Class 2 serial data communications</TD>
<TD vAlign=top align=middle>G </TD>
<TD vAlign=top align=middle>2 </TD>
<TD vAlign=top align=middle>H </TD>
<TD vAlign=top align=middle> </TD>
<TD vAlign=top align=middle> </TD>
<TD vAlign=top align=middle>Y </TD></TR>
<TR>
<TD vAlign=top>U1003</TD>
<TD vAlign=top>Loss of serial communications for class 2 devices</TD>
<TD vAlign=top align=middle>G </TD>
<TD vAlign=top align=middle>2 </TD>
<TD vAlign=top align=middle>H </TD>
<TD vAlign=top align=middle> </TD>
<TD vAlign=top align=middle> </TD>
<TD vAlign=top align=middle>Y </TD></TR>
<TR>
<TD vAlign=top>U1003</TD>
<TD vAlign=top>Loss of Class 2 serial data communications</TD>
<TD vAlign=top align=middle>G </TD>
<TD vAlign=top align=middle>4 </TD>
<TD vAlign=top align=middle>H </TD>
<TD vAlign=top align=middle> </TD>
<TD vAlign=top align=middle><FONT face=Arial

Means they were having a hard time spying on you and could you please call them and let them know what you have been doing lately?http://www.dieselplace.com/forum/smileys/Embarrased.gif

thanks for all the input, guys.


Dropped the truck off at the local dealer yesterday and had them look into the error code thing. They gave me the truck back last night and said "We asked GM for help... blah blah blah... We'll get back to you blah blah blah".


Oh well. got back in the truck and the once-red light was green. Hmph.


_nar_, you're probably right. The big brother factor weighs heavily on me from time to time.

Don't you love it when they tell you that? Very irritating. At least it got better. I think I will avoid this if I buy an LT by disabling onstar.