instrument cluster

[lv2grpl]

Put a 2004 ls6 in a 2004 silverado everything works fine except sometimes the gauge cluster as a whole works and sometimes not, every once in a while it just locks up where its at. The only trouble code is u1000 class 2 data port

[1BADC10]

Found this...


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DTC U1000 or U1255 may set current or history, with or without other DTCs.

These DTCs set when the control module does not receive a message that it was expecting from another control module, and does not know which control module did not send the message.

If the DTC U1000 or U1255 is set in history with other DTCs set current or history, diagnose the other DTCs first.

If the DTC U1000 or U1255 is set current, this usually indicates a module that is currently not communicating or a configuration issue. For example, if the control module is configured for an option (i.e., OnStar, keyless entry, memory mirrors, etc.) that the vehicle does not have, it may expect to receive a message regarding this missing feature. This would usually occur due to the control module being recently replaced and incorrectly set up.

When the DTC U1000 or U1255 is current, the module that is not communicating may not even be listed on the Tech 2 on the Diagnostic Circuit Check /Class 2 Message Monitor list.

If the DTC U1000 or U1255 has set in history without other DTCs, replacing the control module that set the DTC is most likely NOT the solution. The module that has set the code is looking for an input from another module that is not communicating. Because the module did not receive an input that it is expecting to see, it sets a U1000 or U1255 which indicates there was a loss of communications. Look at the customer's concern (i.e., intermittent, erratic tachometer operation). This will probably be a better indication of the control module that is the source of the concern.
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Hope this gives you a good starting point. I'd go through the options, and ensure there's nothing enabled that shouldn't be enabled (not that you haven't attempted, but fresh eyes catch the smallest things).

*edit* BTW, welcome to LS1 Truck... post up some pics of this truck, and give us details of it.