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Home › GMC › 1993 › Forward Control 6.2 J, Standard › Repair and Diagnosis › Engine Performance › System › Engine Controls - Tests W/Codes - V6 › Self-Diagnostic Tests › Code 26, Quad-Driver Circuit 3.8L › QDM Symptoms:

QDM Symptoms:

Puller fan on all the time or will not come on at all.
TCC does not engage.
Poor driveability due to 100 percent canister purge.