SOURCE: Code P0506, Idle control system RPM low
It's common that you get a lot of carbon build up at the base of the throttle body. Give it a good spray cleaning with injector cleaner and dry it with a hair dryer. If you find it still to dirty, you can try it again with a second can or if you can try using Sea Foam that you can buy at an auto parts store like Auto Zone. The Sea foam will clean out the carbon but also create a lot of smoke.
When i say lot's of smoke, just do a search on You Tube for Sea Foam. Good luck and hope this helps.
SOURCE: chevy trailblazer 2007 P0506 &
Cleaning your throttle body should take care of both problems. Clean your throttle body with throttle body cleaner. First disconnect the battery, clean the TB with TB cleaner, must be nice and shiny. When finished, hook the battery back up and drive around for 20 minutes or so with all accessories off, so the computer will relearn a properly functioning throttle body.
Your computer learned some bad habits, so when you changed the battery, the computer thought the throttle body was clean and functioning properly. So when you changed it, this caused all your problems. Very common, keep your throttle body clean, should be done at least once a year. Total cost if you do it yourself is around $5, for the can of TB cleaner.
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