An illuminated Check Engine Light could be caused by a defective VVT-i controller, which changes cam timing for optimal power. Updated parts are available and the repair may be covered under the powertrain warranty.
Car problem reports
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Most reported 2008 Scion tC problems
Some vehicles may develop a condition where they cannot be shifted from "Park" to "Drive" and/or multiple warning lights illuminate when exposed to extreme cold conditions (-14 degrees F) or lower. Our technicians tell us the ignition (IG) relay should be replaced with an updated part to correct this concern.