I check for spark there is no spark at all time when cranking for about five seconds, sometime when i turn the key to cranking and after i turn the key loose the starter will keep turning will this have anything to cause no spark? do have a couple of codes, P2101, P1516
P1516 = Throttle Actuator Position Performance
P2101 = Throttle Actuator "A" Control Motor Circuit Range/Performance
Both of these codes indicate a problem with your throttle position actuator system. I'm not sure how GMC/Chevy treat this, it's possible that if the PCM/ECM will not allow the engine to start if the throttle actuator is not working properly (it may cause the engine to accelerate rapidly when running). You could try replacing the throttle actuator, but that may not solve the problem if it's a wiring issue. Best to have it checked out by a qualified mechanic.
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I check for spark there is no spark at all time when cranking for about five seconds, sometime when i turn the key to cranking and after i turn the key loose the starter will keep turning will this have anything to cause no spark? will and ignition switch cause no spark? how do i check an ignition switch?
It is possible that a bad ignition switch will cause no spark, but in that case the starter wouldn't turn either. In your situation, I think there is no spark because the PCM/ECM is not telling the coil(s) to fire. And I don't think you necessarily have a bad PCM/ECM. You need to have this checked out by a qualified GMC/Chevy technician. As I stated earlier, these codes may prevent the ECM/PCM from providing spark.
i don't have any way to haul it to GMC/Chevy i want to try fixing it my self that why i keep asking questions.
will a crankshaft sensor cause no spark?
A bad crankshaft position sensor can cause no spark but it should also throw a code. The two codes you posted are not for the crankshaft position sensor.
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