I have an 02 with an automatic transmission (5.9). The tach works on and off when ever I start and drive my truck. There isn't a pattern when the tach will do this. I had a code of P1693. Any idea's? Possible loose wire, is the computor going out?

 

I want to say the crank position sensor is going out. The P1693 is a companion code, meaning another code set.

 

yeah its either the crank or cam position sensor i can never keep track...when mine did this the code was for the crank sensor and it fixed but now its doing it again, its behind the starter

 

Any updates??