I cleared my DTCs to install my performance chip and found these codes to clear:
P0302, P0540, P1093 & U1000.
Can anybody give some clues about these codes?
Thanks.

 

P0302=Fault Cylinder B-Misfire Detected (CYL2)
P0540=Manifold Intake Air Heater Circ
P1093= ??? you mean P0093?? it is; Fuel Sys Leak Detected-Large Leak
U100= Lost Comm With ECM/PCM A

Not all codes shown apply to every vehicle model.
P Codes shown with a � symbol may cause a dashboard indicator lamp to light.
Many logged codes are transitory in nature and are automatically reset.
Codes shown below are for GM vehicles only.
DTC P1000 is an indication that the vehicle needs to be driven for a period so that the vehicle can learn certain operating characteristics. This code cannot be cleared using the DTC Reader clear function.


Hope this helps...

 

For future reference you can type in your codes here Diesel Bombers to find them At the top left where it says Bombsite go to drop down menu,tools, OBD codes. Hope this helps

 

yeah is should, I did not know that either...

 

I hate to ring the fire alarm but P0302 and the P1093 could be related. The relation would be a severely leaking injector. Have yours ever been done? One easy way to check is to check your oil. If it's overly full or stinks like diesel fuel then you know something isn't right.

Are you running an aggressive tuner? A P1093 means low rail pressure and an aggressive tuner will allow more fuel than the stock system can supply thus giving you the code. I imagine that it could also get you a random misfire code but I don't know how often you get this code.

The U1000 is a generic loss of comm code for the PCM. I saw a lot of these and they were just phantom codes. Erase it and see if it comes back.

Don't know about the other one. Have to do some checking.

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Welcome to DB.

 

Thanks Guys for the input. I kinda figured there was a better place for me to go with the codes, but couldn't readily find it.
Anyway, my GMC has been running great with no signs of any problems. No, the injectors have not been touched. I did check the oil to make sure no problem there.

Thanks..............