Join Date: May 2011
Location: Frederick MD.
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Sorry, I should have elaborated on that more. The only way to do that is with a scan tool such as AE or any of the more advanced scan tools out there. You either need to get ahold of a scan tool to verify the issue, or you could try pulling the valve cover and inspecting the injector. I've seen the lock nut come off the injector solenoids and cause this code, or the solenoid just burnt up.
I'd also be double checking the FICM plugs and make sure their fully seated, and look over the injector wiring harness for rubbed spots. If all that checks out then you could try replacing the #5 injector, or you could switch that injector out with another one and see if the problem follows the injector. In other words, if you switch out the #5 injector with #3 and then start getting a code for the #3 injector, then it's the injector that's failed. If you switch it and you're still getting a #5 code, then it's a FICM or wiring issue. Make sense?
You can either put in the time and swap stuff around, or have it diagnosed, or pay for the scanner to diagnose it. If I had the truck I could tell you in about 5 minutes if it was an injector or a FICM/wiring issue. If you try and swap around injectors to verify the issue expect to spend about 6 hours doing it, depending on how mechanically inclined you are!