Check engine light - C8 Corvette Forum
 
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post #1 of 2 (permalink) Old 10-17-2020, 04:34 PM Thread Starter
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Check engine light

Driving my 2020 Corvette Z51a short while ago and the check engine light comes on and stays on. I called Onstar for a diagnostic check and their report shows ECM- Engine System Diagnostic code P0700. Next column is diagnostic information which says "IGNORE UNKNOWN DTC" and under Recommended information "No Action Needed"
Anyone else have this issue and can offer any advice? I sent the information to the dealer but don't expect anything back until tomorrow at the earliest. Thank you
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post #2 of 2 (permalink) Old 10-28-2020, 11:10 AM
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I have the same problem after I installed an upgraded exhaust system from Hennesy. The dealer tried to fix it and failed. Seems to be related to the motors that control the exhaust noise. Am now trying to find any codes that fix it and so far no luck.
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