When i got my 1999 chevy venture van it was shifting really hard so i put some sea foam in and put it on my computer code i got was po742 so i reset comp to get rid of code and that worked till today i was driving it and the light come on again got same code so i reset again and test drove it and light is off and drives fine could someone tell me what could be wrong with it thanks
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Transaxle code P0742 says the TCC release switch circuit was closed (indicating the TCC was applied) while the TCC was commanded off. The problem could be electrical like a short in the circuit or mechanical like a faulty TFP valve position switch, sediment in the valve body, faulty TCC mechanism, etc. Check the fluid level if you can and, if not that, take it in for service.