alternator tests fine, battery tests fine -overcharging code p1594- but voltage normal?

Asked by Sep 22, 2016 at 01:01 PM about the 2002 Jeep Liberty Sport

Question type: Maintenance & Repair

the battery light came on once, but turned off and hasn't come on again.
checked and got diagnostic code P1594. all voltage numbers are normal on
battery and altnernator.  what's causing the error code? it's a 2002 but only
has 30,000 miles on it.

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