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Hi, truck has 260k with Smarty Jr delete and 0 tune. Driving and engine turned off. Was running fine. When attempting restart nothing happens. Not all dash lights illuminate when key is turned on. Changed crankshaft position sensor which had the face of the sensor grinded away. Couldn’t see what caused the sensor to get damaged. Batteries 2 years old at 12.68 volts. Ecm is seeing 12.4 volts. Harbor Freight code reader shows 0 dtc’s stored. Smarty Jr. says communication error with can code #’s 122, 121, 116. Checked connections and wiring and all looks good. Currently truck is sitting with batteries disconnected and positive/negative terminals wire tied together to completely drain electronics in hope that electronics will reset and allow truck to start. My question is what is the next step toward diagnosing what the problem is?
 
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