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U1000 Diagnostic Trouble Code Discussion for September 2007

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, OTHER SERVICE LMPS VIN: 1GNDT13573
U1000: Class 2 serial Comm. Problem. When the heater fan is turned on the 4wd service lamp, ABS lamp, Brake warning lamps come on and the U1041 code sets when fan is turned on. When this happens, the fan does not come on and the communication with the scanner is cut off. When the fan is turned of...
September 05, 2007
2001 Oldsmobile Alero GL 2.4L No Start VIN: 1G3NL12T11
U1000: Class 2 Communication Malfunction. Thank you in advance or your time. This vehicle had an intermittent hard start. When it sat for a while, it would turn over a few times before it would start. Tested and found that I was losing fuel pressure while sitting. The fuel pressure regulator was leaki...
September 10, 2007
2004 Chevrolet Silverado 3500 LS 6.6L gauges VIN: 1GBJC34184
U1000: Class 2 Communication Malfunction. The fuel gauge shows zero. There is 5 volts available at both senders. Ran a redundant ground to senders - no change. We have wiring schematics from Mitchell and Alldata. According to Alldata the PCM sends out 5 volts to the senders. The senders return the sig...
September 13, 2007