supra dont go stututu

[suprazg]

So my car keeps getting drivetrain malfunction i check on mhd for the battery volt and on there when im idle i get 15.3 volts idk if supra just runs high or my car is being overcharged by the alternator
next my battery from the back is ready 12.01 volts when started but from the front its reading 15.3 so idk what the fuck going on next these are the codes im getting
im tuned on stage 2 and ecu is unlocked

if you guys know anything please let me know taking it to the dealer tomorrow

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[MYA90SUPRA]

I'm wondering if your battery is bad causing the charging system to go full bore. From other posts in this forum low voltage/bad connections make this car do some crazy things.

 

[suprazg]

thats what i was thinking but then im like why is the battery volt soo fucking high when idle when it should be 14.6 and i did all the test too since im also a mechanic but shit i never seen this shit

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