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Q: 2004 GMC box truck reset check engine?
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For any new truck you may have to have the computer reset you can find one at Wal mart for 98$ plus tax or order on off the web. It reads what the truck problems are .


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Does the radio lock when you turn off check engine light on 2004 Jeep Liberty?

I think you are assuming that to reset the check engine light you can just disconnect the battery. Disconnecting the battery on a 2004 OBD2 compliant vehicle will not reset the check engine light. It must be reset with an OBD2 scan tool. This would work on OBD1 vehicle but not on OBD2 vehicles. So the radio issue is mute. Have the problem that set the check engine light repaired and then reset the light with the tool. Reset the light without correcting the problem and the light will just come back on.