Question about 2003 Pontiac Montana

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Backlights for speedometer and radio will work sometime, but not other times, left rear brake light won't work...bulb has been changed and fuses have been checked for all the problems

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Hi! This can be caused by a faulty PCM (powertrain control module). The PCM has connectivity on all electrical current that runs inside the car which includes the engine, transmission, accessories, etc... As a first course of action please swap the PCM. Hope this helps and thank you for using FixYa!

Posted on Nov 07, 2010

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Posted on Jan 02, 2017

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