michaelkoenig24
Suburban Diesel Glow Plug Issue
Summary of the thread
A 2023 Chevrolet Suburban with a diesel engine is experiencing issues with the preheating lamp not switching off and an error stored in the memory, suggesting a glow plug problem. The engine light is on, and there are symptoms of rough engine combustion during cold starts. It is advised to have the vehicle checked at a workshop, as driving with a defective glow plug can lead to further engine damage. The issue was confirmed to be a defective glow plug, which was replaced at a cost.
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4 comment(s)
michaelkoenig24 (community.author)
Yes, the engine light is on! And now that you mention it, the engine combustion isn't exactly smooth at cold start. Could it be more than just one glow plug gone bad? Because I only found one related error code.
milastar8
It's possible only one has failed, but since they work together to optimize engine combustion, especially during cold starts, the engine light comes on anyway. Given the symptoms and mileage, it's best to get it checked at a workshop. Continuing to drive with a defective glow plug can cause further engine damage.
michaelkoenig24 (community.author)
Okay, I appreciate the advice! Dropped it off at the workshop today. Turns out it was indeed a defective glow plug, costing me around 440€ to replace. Thanks for pointing me in the right direction!
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CHEVROLET
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SUBURBAN
milastar8
Sounds like a defective glow plug, alright. Is the engine light on too? Any noticeable engine misfire or trouble starting, especially when it's cold? That mileage definitely puts glow plugs in the suspect list.