Question about 2004 GMC Sierra
This is OBD 2 and u will need a scan tool to access trouble codes, this system started in 96, on old pre 96 system u could blink the check engine light and get the code. U CAN GO TO ANY KRAGEN OR AUTOZONE AND THEY WILL TEST THE SYSTEM FOR TROUBLE CODES FOR FREE.
Posted on Feb 25, 2009
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Posted on Jan 02, 2017
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