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U1000 Diagnostic Trouble Code Discussion for February 2006

Class 2 Communication Malfunction

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Trouble Ticket Help Requests for DTC U1000
Help Request Posted
2003 Chevrolet Trailblazer LS 4.2L MIL Lamp on VIN: 1GNET165X3
U1000: Serial communication. ... PO171 System Lean code at idle. Long term fuel trim at 22 Short trim fluctuating near 0. Fuel pressure good at 54 PSI, no vacuum leaks found, sensor data looks good, oxygen sensor switching very good. Also had a U1000 - class 2 serial data code stored, whi...
February 01, 2006