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Dash Stays On And Wont Turn On?

karlosg23

By karlosg23
in Ask A GM Technician

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karlosg23 Enthusiast

karlosg23

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ok so this weekend my dad welded the frame on my truck and only disconected the positive side of the battery. After he was done we put it back to gether and when i got ready to start it, it wouldnt and now the dashboard light stays on and when i try to crank it it wont evern try to start so i know its not the security system. The truck is a 2003 crew cab whit a 5.3 from an 05. my guess is that the ECM messed up.?

karlosg23 Enthusiast

karlosg23

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i have tryed it and nothing works. i even swaped the vcm form my dads06 and nothing so my guess is the ecm or fuse moduel.

Diconnect the neg side of the battery for a few minutes and see if it resets :confused:
Jsdirt Senior Enthusiast

Jsdirt

Posted
Posted

More than likely it's just a bad connection. Try moving the battery cable around while tightening.

dansavage3 New Member

dansavage3

Posted
Posted

On electronically controlled vehicles you cannot disconnect the positive side of the battery, it spikes the system and can knock out the ECM, the transmission controller and/or the Body control module. Your lights are controlled by the BCM, your ignition by the ECM. To test the function of the ECM cycle the key on then off three times within five seconds and leave on, the service engine light should start blinking showing the DTC codes that the computer has stored, if no codes the light will flash once pause and flash twice indicating that the ECm is healthy, if not, they can be expensive to replace.

Jsdirt Senior Enthusiast

Jsdirt

Posted
Posted

Post '96 vehicles do this?

Jsdirt Senior Enthusiast

Jsdirt

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Posted

Sorry to hear that. :thumbs:

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