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Re: GM C3 question..is Diagnostic Mode hardwired in ECM?
Posted to Technical Discussion Forum on 5/17/2003 6 Replies

Hi Ken,

Allen wrote,

Hello all,

This vehicle came in as an emissions test failure, failing for CO over 7% on 15/50 and 25/25.

I found the check engine light on when I pulled it in, so first test was to pull codes. ECM had no codes stored, but the data ... Login to read more.

6 Replies Received (View Replies)