1999 grandprix code po502
Replaced speed sensor did not fix problem speedo dose not work and will not shift if you clear ode it will shift once is ecm a problem on the 99 gradprix
Cars & Trucks - Pontiac - Grand Prix - 1999 Pontiac Grand Prix
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Answers & Comments
Check wires and connection.
Check harness / wiring for continuity , damage , chaffing, connector contact, etc... from speed sensor to ECM.