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Diagnostic Port

racherry

By racherry
in Ask A GM Technician

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racherry Enthusiast

racherry

Posted
Posted

I have a 2003 Chevy silverado 2500 hd with the 8.1 engine and 6 speed manual trans I have a couple of questions 1, where is the diagmostic port for a scanner? 2, how do you reset the change engine oil message on the dashboard display?

MikeNH Senior Enthusiast

MikeNH

Posted
Posted

To reset the oil life message turn the key to on (not starting the engine), push the gas pedal to the floor fully three times and then start it up. Should say oil life reset.

 

Diag port is under the dash, sort of in front of the brake pedal. Just stick your head down there, only one plug like it.

racherry Enthusiast

racherry

Posted
  • Author
Posted
To reset the oil life message turn the key to on (not starting the engine), push the gas pedal to the floor fully three times and then start it up. Should say oil life reset.

 

Diag port is under the dash, sort of in front of the brake pedal. Just stick your head down there, only one plug like it.

 

 

I looked all under the dash and i did not see it

MikeNH Senior Enthusiast

MikeNH

Posted
Posted

Visible in this picture to the right of the parking brake pedal-

 

DSC03165.JPG

racherry Enthusiast

racherry

Posted
  • Author
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Visible in this picture to the right of the parking brake pedal-

 

DSC03165.JPG

my truck is different than this picture I have a 6 speed manual trans I wonder if it makes a difference?

MikeNH Senior Enthusiast

MikeNH

Posted
Posted

6-speed might make a difference, never seen one in person.

 

You know what the connector looks like correct? Pretty sure the plug is supposed to be within 12 or 18" of the steering column or something weird. My '03 was an auto but if memory served the plug just clipped into a metal housing. Maybe someone removed it and tucked the plug up under the knee bolster?

racherry Enthusiast

racherry

Posted
  • Author
Posted
6-speed might make a difference, never seen one in person.

 

You know what the connector looks like correct? Pretty sure the plug is supposed to be within 12 or 18" of the steering column or something weird. My '03 was an auto but if memory served the plug just clipped into a metal housing. Maybe someone removed it and tucked the plug up under the knee bolster?

 

 

I know exactly what the plug looks like and where it is supposed to be I have other trucks and cars and have used the ports with my scanner I just cant find it on this truck

MikeNH Senior Enthusiast

MikeNH

Posted
Posted

Drop the knee bolster and take a look around? It has to be there somewhere. :thumbs:

MikeNH Senior Enthusiast

MikeNH

Posted
Posted
ALDL connector MUST be accessible without removing anything. Its the Fed law.

 

It may have been moved by a previous owner and I've plugged into tons of cars where it was hidden behind a panel.

racherry Enthusiast

racherry

Posted
  • Author
Posted
ALDL connector MUST be accessible without removing anything. Its the Fed law.

 

It may have been moved by a previous owner and I've plugged into tons of cars where it was hidden behind a panel.

 

 

 

I found it, it was tucked up under the dash next to the parking brake release

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