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The owner had already replaced the spark plugs and transmission fluid with no success. The scan tool showed no hard codes, just a history of random communication errors. On these mid-90s GM vehicles, heat cycles and age can cause microscopic cracks in the PCM’s circuit board, leading to exactly these kinds of ghost-in-the-machine problems.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.