2000 Camaro CEL error code -- P1550

Friend is getting a check engine light with an error code of P1550 on his Camaro (2000 - 6 cyl automatic)
According to the tech (independent), it equates to something like
"Transmission Auxiliary Input".
Does anyone have further information on this error code? I have looked on the net and found a site that said it was the PSPS Out of Self Test Range.
Appreciate any help.
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