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2007 Denali, 37,000 miles, check engine light..trans..3rd gear…

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2007 Denali, 37,000 miles, check...
2007 Denali, 37,000 miles, check engine light just came on after shifting out of manual mode and now trans. seems like it wont shift past 3rd gear. Also now can shift into manual mode, but it doesn't function or display the gear. Any Ideas?
Submitted: 8 years ago.Category: GM
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Answered in 31 minutes by:
6/10/2010
GM Mechanic: Dave Nova, GMC Technician replied 8 years ago
Dave Nova
Dave Nova, GMC Technician
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Satisfied Customers: 19,452
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Is the check engine light on?
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Customer reply replied 8 years ago
Check engine light is still on. I drove the vehicle a few yards in reverse and it seemed to "fix" the trans. problem (It now will shift into Manual and display the gear numbers). I didn't drive on highway yet to see if it shifts above 3rd. but yes the check engine is still on.
GM Mechanic: Dave Nova, GMC Technician replied 8 years ago
You will need to have the vehicle computer scanned for trouble codes. You can have this done at Auto Zone for free. Once you have the codes, I can help you diagnose what the problem is.
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Customer reply replied 8 years ago
Thank You. I'll have the codes pulled.
GM Mechanic: Dave Nova, GMC Technician replied 8 years ago
Let me know what you find.
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