Code 12; Means the battery was disconnected within the last 50 key-on cycles. Ignore this code.
Code 24; Throttle position sensor input voltage is above the maximum acceptable voltage.
Code 17; Engine is cold too long. engine coolant temp remains below normal during vehicle travel. (thermostat)
Code 55; Means end of message/codes.
Your problem is most likely due to a defect thermostat that is stuck open. Replace the thermostat.
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