Crankshaft position sensor circuit malfunction.
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According to Standard Catalog of Chevrolet Trucks by John Gunnell, 1995, it depends on your VIN code. 5.7L TBIVIN Code A190 hp @ 4000 rpm300 lb.-ft. @ 2400 rpm Standard in Suburbans, 1 ton Vans, optional in C/K Trucks 5.7L TBIVIN Code K210 hp @ 3600 rpm300 lb.-ft. @ 2800 rpm Standard in Blazer, optional in Suburbans, Vans, and Pickups
Code 173 indicates the oxygen sensor is telling the computer that the engine is running rich.
The error code, U1000, on a 2002 Chevrolet Trailblazer might mean that there is a communication problem with the ECM. ECM stands for Engine Control Module. Sometimes when it rains and the engine gets wet, this light will come on to tell the driver there might be a wire that got wet going to an electronic part. It will also indicate a short of some kind in the wiring so it is best to check all wire connections.
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Trouble code P0201 means: Injector Circuit / Open - Cylinder 1 Need 2 replace Injector on cylinder 1