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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 107 (Instrument Panel - C/K Series Pickups) >> Description & Operation >> Service Engine Soon Or Check Engine Warning Light

Service Engine Soon Or Check Engine Warning Light

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 1991 GMC Pickup, 1991 GMC Cab & Chassis, 1991 GMC C3500 HD, 1991 Chevrolet Pickup, and 1991 Chevrolet Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

This warning light is part of computer command control system and flashes if a malfunction or trouble code(s) exists. Light illuminates when ignition is turned on. If no problem exists, light goes out when engine starts.

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