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2021 5.3 8 speed whining and sluggish under power

turnertr
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turnertr New Member

turnertr

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At 82,000 miles and following oil change/tire rotation, noticed whining under hood.  Also, sluggish performance under load.  Had intermittent check engine light in the past - not read yet.  Help!

2021 5.3 8 speed whining and sluggish under power

 
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turnertr New Member

turnertr

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Update:  replaced idler pulley and belt.  Whining is gone.

Only code shown was for Brakes:Low Battery.

Chugging going uphill still happening.  Worried about additional damage to tranny if not corrected!!

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