7798000 BMW E90 E92 E93 320d Glow Plug Control Module – OEM Used & Tested

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This BMW Glow Plug Control Module is a genuine OEM diesel engine electronics component for the BMW E90, E92 and E93 320d diesel models. Primary OEM number 7798000. It is designed to control the glow plugs during cold starts, switching and monitoring the high current that heats the combustion chambers of a diesel engine.

Its job is to switch the glow plug supply at the right time and for the right duration, so that the engine can start cleanly and run smoothly while it is still cold. It communicates with the engine control unit and regulates the preheating and post-glow phases. A properly working glow plug control module supports reliable cold starting, lower start-up smoke and emissions and correct operation of the glow plug system. Because the module handles high current and heat, it is a known failure point on high-mileage diesel cars, and a tested replacement is a practical way to restore reliable cold-start behavior without the cost of a new part.

Common signs of a faulty unit include long cranking on cold mornings, rough or uneven idle after start-up, white or gray smoke, a glow plug warning lamp on the dashboard, stored glow plug fault codes, or glow plugs that never heat. When the module does not switch the glow plugs correctly, the glow plug system may fail to preheat the cylinders, which makes starting harder and increases wear and emissions.

This is a used original part, removed from a vehicle and tested before sale. Match the exact OEM number 7798000 before ordering. Professional installation is recommended, and the part may need to be coded or adapted with a suitable diagnostic tool where applicable.