Silverado :: 2004 Z71 Won't Start - Getting Error Code U1000 On Scanner
Mar 30, 2013
I have an 04 Silverado Z71. I am getting error code U1000 on my Scanner. As well as a torque converter code and a front axel code. I can not start the truck. Its as if its in a safety lock out or something.
I talked to a service tech at the lock gmc dealer and he said the U1000 code was definitely the reason it wont start. Possible bad ECM somewhere in the system.
Where can i find a full wiring schematic for my truck ?
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Scanner found u0293,,,recommended reseal power inverter. what I have read for two days says its Power source ECU.. What happened,,,kids was driving car, had 3 phones plugged in, ac, lights, and when she tried to set cruise, car went into limp mode, gear lights flashing,,,went into neutral,,,stop beside highway,,had to be towed.
12 volt battery charged and tested ok. no blown fuses. I reset ECU by jumping pins 14 and 4. no change, tried master reset by holding brake and power button down, no change..removed ecu fuse to reset, no change.
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While I was backing it out of the driveway the warning triangle came on and the MFD said "problem" the scanner showed the P0A80 code. I thought that was odd, but maybe related to the flat 12v battery and self discharge of the traction battery so I reset the code, it drove normally to the shops. When I restarted it and started to drive it threw the same code again.
I then installed techstream on my laptop to try and get some more in depth answers but was having trouble getting that running on Windows 8. So overnight I disconnected the 12v battery and would try again in the morning.
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It ran like this for 20 mins or so and the engine stopped, techstream showed pretty normal cell voltages, I couldn't see any wild differences between the cells.
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My question is that whether the low engine temperature can cause the difficulty to start the engine? How can I figure out which sensor is bad?
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So, two days later, the warning disappeared and I thought it was just an electrical glitch.
Fast-forward to last week, the warning light came back on and took it in again. I suggested that they take a look at the ignition switch and sure enough, they fixed it for me over the weekend by installing a new ignition switch and the problem is gone.
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