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Is there a problem if the 'service charging system message appears but does not show the next time car is started for a 1999 Cadillac Deville?
Wiki User
∙ 15y ago
The computers on most cars will reset themselves after a short period of time. The codes will then go into history mode. Until the computer performs another test on the systems, you will not see the code again. It does not mean the problem is not there. For instance I have a faulty EGR valve on my Eldorado. It didn't fix itself but every once and a while the computer will test the system and the code will come up current.
Certain situations may arise where a false positive may occur but I would let the code come up again before addressing the problem. Finally have your mechanic look at the car when the code is active (if possible) because that is the best time to assess the problem.
Some shops have a tough time chasing down the reason for codes in the history of the computer.
Wiki User
∙ 15y ago
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