2011 Chevrolet Other Dumb Question about Diagnostic Scanner

2011 CHEVROLET
35,000 MILES • 1.2L • MANUAL
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THEHALLMARK
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  • 1 POST
a) This may sound dumb, but if there is no 'Check Engine' light or any other warning light ON, is there any use of a diagnostic scanner. If yes, could you provide an example of a problem that can be diagnosed with the scanner in the absence of fault code or check engine light?

Aug 19, 2015 at 11:57 PM
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WRENCHTECH
  • ✓Experienced Mechanic
  • 20,761 POSTS
Of course there is, assuming this is a professional level scan tool.

Codes are only a starting point. The data is far more of a tool to diagnose an issue and get an understanding to what is taking place in the system. A bidirectional tool can also be used to activate circuits for testing or performing learning functions.

Not having codes merely separates the DIYers from the pros.
Aug 20, 2015 at 12:25 AM
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