Power interruption error code 5A

[puddinboo]

I unlocked my cluster and read voltage directly from it here is my results.

Vehicle in park I get 13.3-13.7 v (850 RPMS)
Vehicle in drive 12.2v - 12.5 v (630 RPMS)
When I'm stopped fully at a light I get the low readings,when I take off I get the normal readings like when in park.
I reset my Code 5A reading and took the X for a drive and no code or the 3 orange lights as of now.
I am concerned my Alternator isn't put out enough voltage while in drive? Or is this normal?

Originally Posted by andrewwynn

Idle not the problem. The voltage dip is usually worst when coming off throttle to coast to a stop. Any time I've had a weak alternator that's when I had the voltage dip.

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