Question about 2001 Cadillac DeVille
Here is a link to the U0156 there is not a lot of information about the U0156. It is something to do with the ignition switch or some electrical running to the ignition switch.
Causes A code P0420 may mean that one or more of the following has happened:
Posted on Jun 26, 2011
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Posted on Jan 02, 2017
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