Question about GMC Yukon
Sound like an electrical connections or sensors go to bad; I suggest check harnesses too.
The means of communicating with the control module is the Data Link Connector (DLC) located under the instrument panel and is sometimes covered by a plastic cover labeled "Diagnostic Connector." The DLC is used in the assembly plant to receive engine information to determine proper operation before it leaves the plant. The DTC(s) stored in the control module memory can be displayed either through the Tech 1 Scan Tool, a hand held diagnostic scanner plugged into the DLC connector, or by counting the number of flashes of the Malfunction Indicator Lamp (MIL) "Service Engine Soon" when the diagnostic terminal of the DLC is grounded. The DLC terminal "B" (diagnostic terminal) is the second terminal from the right of the DLC top row. The terminal is most easily grounded by connecting it to terminal "A" (internal control module ground), which is located to the right of terminal "B" on the top row of the DLC.
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Posted on Apr 01, 2011
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Posted on Jan 02, 2017
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