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U1000 Diagnostic Trouble Code Discussion for May 2010

Class 2 Communication Malfunction


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Trouble Ticket Help Requests for DTC U1000
Help Request Posted
2005 Chevrolet Silverado 1500 5.3L Intermittent comm. VIN: 1GCEK19Z35
This vehicle came in about a week ago with a communication problem. Customer needs to get state inspection sticker and they said there was no communication with the vehicle. I hooked up our Tech 2 and had no problems at all. Data came through just fine on all ...
May 03, 2010
2004 Chevrolet Tahoe LS 5.3L No Start VIN: 1GNEC13Z04
U1000: Class serial data malfuntion. ... "no start-check my alternator"! Would barely start and stall! Starter may chatter like dead battery or bad switch! No communication pcm/tcm! Found codes in BCM U1000 U1016.and B 2961. Finally got U0107 from pcm and was able to unplug tac module to ...
May 17, 2010
2003 GMC Sierra 1500 4.8L No Start, No crank` VIN: 1GTEK19V43
U1000: Class 2 communication error. PLEASE HELP! Car came in with Service 4WD light on. I found TSB for faulty TCCM and flash update. I replaced TCCM and performed reprogramming through GM-TIS. After this I thought I would be nice and check PCM for updates. I found an update for Idle surge so I ...
May 18, 2010
2008 Nissan Titan LE 5.6L No Start, no mil VIN: 1N6AA07D88
U1000: can no comm. ... there. I have this 08 titan with a crank but no start. Hooked up my scanner and scanner would not communicate with ecu. I found code u1000 and c1735 ign fault in bcm and tcm. I also noticed that the MIL will not turn on. I checked power supply to ecu no pr...
May 29, 2010
2005 Chevrolet Silverado 1500 5.3L Intermittent comm. VIN: 1GCEK19Z35
This vehicle came in about a week ago with a communication problem. Customer needs to get state inspection sticker and they said there was no communication with the vehicle. I hooked up our Tech 2 and had no problems at all. Data came through just fine on all ...
May 03, 2010
2004 Chevrolet Tahoe LS 5.3L No Start VIN: 1GNEC13Z04
U1000: Class serial data malfuntion. ... "no start-check my alternator"! Would barely start and stall! Starter may chatter like dead battery or bad switch! No communication pcm/tcm! Found codes in BCM U1000 U1016.and B 2961. Finally got U0107 from pcm and was able to unplug tac module to ...
May 17, 2010
2003 GMC Sierra 1500 4.8L No Start, No crank` VIN: 1GTEK19V43
U1000: Class 2 communication error. PLEASE HELP! Car came in with Service 4WD light on. I found TSB for faulty TCCM and flash update. I replaced TCCM and performed reprogramming through GM-TIS. After this I thought I would be nice and check PCM for updates. I found an update for Idle surge so I ...
May 18, 2010
2008 Nissan Titan LE 5.6L No Start, no mil VIN: 1N6AA07D88
U1000: can no comm. ... there. I have this 08 titan with a crank but no start. Hooked up my scanner and scanner would not communicate with ecu. I found code u1000 and c1735 ign fault in bcm and tcm. I also noticed that the MIL will not turn on. I checked power supply to ecu no pr...
May 29, 2010