A code 67 indicates that during engine cranking or KOEO self-test, signal voltage was greater than specification at the A/C input to the ECM or at the Neutral Drive Switch input to the ECM. Possible causes for this fault are:
A/C circuit shorted to power
Neutral clutch/drive circuits open
Neutral clutch switch open
Faulty ECM
Starter relay disconnected during the KOEO test
Take care
~Chris
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