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U1000 Diagnostic Trouble Code Discussion for October 2005

Class 2 Communication Malfunction

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Trouble Ticket Help Requests for DTC U1000
Help Request Posted
2002 Pontiac Sunfire SE 2.2L No Start VIN: 1G2JB12452
U1000: Class 2 Communication Malfunction. Came in on hook no start. All IPC lamps operating normal, no security lamp flashing. Got out mastertech to check cranking RPM & vehicle started. Drove into shop & retrieved codes. Checked module status key off BCM & radio respond. Key on PCM, BCM &...
October 18, 2005
2002 Chevrolet Silverado 2500 HD 6.6L MIL Lamp on, ABS and BRAKE lites VIN: 1GCHK23132
U1000: Class 2 Communication Malfunction. ... positive battery cable which welded itself to the transmission cooler lines just ahead of the starter. The current flow was so high that one of the negative cables actually caught fire. Obviously, the truck was towed to us and by the time we got the correc...
October 20, 2005
2002 Chevrolet Trailblazer LS 4.2L Stall VIN: 1GNDT13S52
U1000: class 2 serial data problem. ... it should be simple but we are having a difficult time. First of all the customer came in with a complaint of the 4WD staying in 4LO. When we investigated, the system was oerating normally. The other complaint was that the engine would start to sag and los...
October 25, 2005