Dude the lightning bolt means electrical fault, in order to see the code push the odometer reset and trip button same time and release it tells you what it wants..
Mack uses this light as their check engine light.
If you have cold weather its a tire pressure code that may take days to go away
SOURCE: i have a warning light that looks like a lightning
I believe that means your battery has a low charge or your alternator is not charging like it should be.
SOURCE: dashboard light
The answer will be in the owner's manual for sure. But it probably is low alternator output voltage.
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