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2010 Mercedes-Benz GL550 Questions

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How could this have possibly caused a problem with TCU? Is it SW got corrupted or is it mechanical? Is it the TCU. that's what all the codes are pointing to.
It starts loud and then stops and is not so loud, also quietens when driving but starts when still. happens as soon as car is started. It is louder in the mornings. Crackling sound
Crackling noise coming from the engine area, it starts loud and then stops and is not so loud, also quietens when driving but starts when still. happens as soon as car is started. It is louder in the mornings.
Crackling noise coming from the engine area, it starts loud and then stops and is not so loud, also quietens when driving but starts when still. happens as soon as car is started. It is louder in the mornings.
Crackling noise coming from the engine area, it starts loud and then stops and is not so loud, also quietens when driving but starts when still. happens as soon as car is started. It is louder in the mornings.
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