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Q: why when you turn the ign,does the shift idicator go to L2,and truck wont start on 2003 Chevrolet Silverado 2500 HD

when you turn the key to start truck,the shift indicator goes directly to L2 and the truck won't start. It doesn't turn over or anything,replaced nuetral safety switch but did not correct problem.Could it be the speed sensor,trans computer or something else.The truck s battery is fine and there is power everywhere,but I can hear something clicking when you turn key,just don'know what it is,it has a snow plow and dump bed so don't know if all the wireing from that could be causeing problems or not.Din't throw any cvodes that I know of,so I'm at a loss.Got any suggestions?
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To check the computer(s) you need a scan tool (not code reader). You'll need to look at the inputs to the Engine Control Module (ECM, or powertrain control module (PCM)). See if it is actually agreeing with the Shift Indicator. If the PCM input and the shift indicator agree, and you are sure the Neutral Safety Switch is new and CORRECTLY INSTALLED, then you could have a wiring issue from the switch to the PCM/TCM. I would first loosen the neutral safety switch and rotate it and watch the shift indicator and the PCM inputs to see if they change as the switch is moved. This will give us a better idea as to the problem. Let us know what happens.
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