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How do you generate fault codes on a 2004 gmc sierra 5.3L

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Unplug any sensor and it will pop a code and the light

Posted on Nov 10, 2010

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Posted on Jan 02, 2017

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Look at your generator. There is something fault with it.

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Color coded wiring diagram 1995 gmc sierra electric windows


Google the
wiring diagram 1995 gmc sierra electric windows I found several systems offering what you require.
But what is the problem, 99% of the time in that year the window regulator was at fault, it was made from a stapped steel housing verses an cast unit. We check the left switch for power, disconnect the two wire connector at the motor, and see if the motor has power to one side or the other in the connector. If the switch has power to it, and the motor has power to it as you press the button, the motor is at fault.

Good luck.

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2003 GMC Sierra 5.3L (has 2004 engine) Drive by wire. Reduced engine power (Limp Mode). Following error codes - P1516, P2135, P0120. Checked all connections at throttle body(Wiggle tested the individual...


CODE PO120 - TP SENSOR 1 SIGNAL RANGE PERFORMANCE. CODE P1516 - TAC MODULE THROTTLE ACTUATOR POSITION PERFORMANCE. CODE P2135 - THROTTLE POSITION SENSOR 1 - 2 CORRELATION ERROR. THIS IS A DEALERSHIP FIX YOU HAVE PROBLEMS OR FAULTS IN THE THROTTLE POSITION SENSOR.

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1 Answer

I need to unlock a 2004 gmc sierra cd player


Phone the dealer with the vin # of your sierra and they will be able to give u the code which u need but follow the operators manual..Hope this helps.

Sep 12, 2010 | 2004 GMC Sierra

1 Answer

Just changed driver side catlytic converter... o2 sensors on that side also. Now I'm getting a PO496 code. Any help on this ???


your purge valve solinoid isnt closing properly so just take it out and clean it and reset the fault code

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1 Answer

I have a 2004 GMC Truck that misses or hesitates


If you are sure its not the plugs or wires, I woud go with the coils next, test each one, if they check out ok then perhaps the injectors.

Oct 08, 2009 | 2004 GMC Sierra

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