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To check the MIL (Malfunction Indicator Lamp) codes on a 1990 GMC Suburban, you can use an OBD-I scanner or a paperclip for a manual method. Locate the diagnostic connector under the dash near the driver's side. Use a paperclip to short terminals A and B on the connector, then turn the ignition to the "On" position without starting the engine. The check engine light will flash a series of codes that indicate any trouble codes stored in the vehicle's computer.

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3d ago

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