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A mechanic informed me that I could reset the codes on my truck by unhooking the battery cables and clamping the positive and negative together for 20 minutes. My truck is a diesel, therefore having two batteries. I am an idiot and when I went to hook up the one side, I forgot to unclamp the other side thus leaving the positive and negative terminals hooked up together. I quickly pulled it back off, but sparks flew and now my truck says that it has a low battery voltage and is in battery saving mode. What did I fry?
 

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You probably fried the other battery i would start by having them both load tested.
 

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Buy a cheapo code reader from Harbor Freight so you can read and clear codes at your leisure. They're universal and fairly cheap, especially with the 20% off coupon.
 
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