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sergio

Thermal engine starting problem on a Mercedes GLC hybrid

Hello everyone, I own a 2017 Mercedes GLC hybrid with 100,000 km on the odometer. I recently encountered a problem with starting the combustion engine. Although the starter is new and the car starts correctly in hybrid mode, the combustion engine has difficulty starting when the computer makes the transition from electric to thermal. It doesn't start instantly and an error message even appears after starting. Has anyone ever encountered this problem or have any advice to give me? Thank you in advance for your answers. Sincerely, Serge.

(Translated from French)

Summary of the thread

A 2017 Mercedes GLC hybrid is experiencing difficulty starting the combustion engine during the transition from electric to thermal mode, despite a new starter and proper functioning in hybrid mode. Possible causes include issues with spark plugs, ignition coils, battery connections, or the hybrid system's control module. Suggested solutions involve checking these components and using an OBD-II scanner for error codes, with a recommendation to consult a professional if the problem persists.

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4 comment(s)

CarlyMechanic

Check the condition of the spark plugs and ignition coils, as worn or faulty components can cause starting issues. Ensure they are in good condition and properly connected. If the problem persists, it might be worth checking for any error codes using an OBD-II scanner to get more specific information. Let me know how it goes or if you have any further questions!

sergio (community.author)

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community_author_wrote_on

Check the condition of the spark plugs and ignition coils, as worn or faulty components can cause starting issues. Ensure they are in good condition and properly connected. If the problem persists, it might be worth checking for any error codes using an OBD-II scanner to get more specific information. Let me know how it goes or if you have any further questions!

Thank you for your response. Everything is ok if I activate sport mode; it starts perfectly, for example, and the engine runs very well. It's only in hybrid mode that the start of the thermal engine is not normal: as if the current does not reach the starter instantly, but after 10 seconds it starts immediately with an error message. The error message is about the starter even though it works fine.

(community_translated_from_language)

CarlyMechanic

community_quotation:

community_author_wrote_on

Thank you for your response. Everything is ok if I activate sport mode; it starts perfectly, for example, and the engine runs very well. It's only in hybrid mode that the start of the thermal engine is not normal: as if the current does not reach the starter instantly, but after 10 seconds it starts immediately with an error message. The error message is about the starter even though it works fine.

Check the battery connections and ensure they are clean and secure, as poor connections can affect the transition from electric to combustion mode. If the issue continues, it might be related to the hybrid system's control module. Consider having a professional diagnose it, as this could be a complex issue. Let me know if you have any further questions!

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MERCEDES

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GLC