P1550 means PSPS Out Of Self Test Range
Consult an expert around you to fix this issue.
This is a common problem. the abs module is losing the vehicle speed output from the transmission. i have found a company who re manufactures for rather cheap the company is out of taunton massachusettes. bba remanufacturing inc you can call them at 18665732740 you will need the module number off of the module itself.
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