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Home >> Jeep >> 2018 >> Grand Cherokee Trackhawk >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Emissions Control >> Description >> Diagnostic Trouble Codes >> Bulb Check
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Bulb Check

Each time the ignition key is turned to the ON position, the malfunction indicator (check engine) lamp on the instrument panel should illuminate for approximately 2 seconds then go out. This is done for a bulb check.