Code P1529 sets in the ECM (Engine Control Module) to advise that the TCM (Transmission Control Module) requested the ECM to turn on the MIL (Malfuntion Indicator Light). What this means is there's a transmission code set in the TCM. You will need a manufacturer specific scan tool to pull Transmission codes and find out what's wrong with the trans. Some aftermarket scanners/code pullers only have the capability to pull Engine codes. -hope this helps
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