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Car came with code p0641 , would drive good until you accelerated quickly at higher speeds around 40-65Mph give or take . At quick accelerations / higher speeds p0641 would return. Limp mode won’t go past 30+ etc. drove to the store the other day and when I came out no crank no start . Tried Jump starting while tapping the starter and nothing . Power at the relay of starter fuse appears good . Connections at the starter tested good with the test light.
When you say you tested the connections at the starter with a test light and they were "good", what does that mean?
Power at the B+ cable lighting the light, and light at the S post while attempting to crank, and no light on the engine block cranking (this is what I would take to mean the connections at the starter tested good) then the starter is bad.
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