Got an 03 GMC sierra that will spin over but wont start. Only code showing was a security code for no fuel P1626. I disabled the vats through hptuners and still wont start. It has 55-60psi while cranking and has spark at the plugs(only checked 3 plugs). Plug fires at the same time as compression hits. Wont hit a lick on starting fluid. With a test light the injectors show to be firing. Any ideas what to do next?

 

I think on a thread a while back something like this about remote starters and aftermarket radios messing with security. Just something to look into

 

P1626 Theft deterrent fuel enable signal lost. It is an Anti theft code

Google the code and follow the diagnostic tree to troubleshoot the issue.

 

Aftermarket alarm system can cause issues.

I typically remove them to rule them out.

It could be anything from the ignition switch to the body control module.

The best thing to do is follow the diagnostics procedures for the code and see where the fault is.

 

I thought by turning off the vats in hptuners would eliminate any anti theft problems. Maybe I'm wrong on that but the code went away and hasn't come back.

 

It may, but you need to do the diagnostics based on the code.

If there is a loose or broken wire It may cause the vehicle not to start.

https://www.performancetrucks.net/fo...-503550/page2/


Does HPT read Body codes or only engine and transmission codes???

 

I dont think it does body codes

 

Don't see any problems with the wiring. Googled the code and only thing I find on fixing the issue is to permanently ground the yellow/black wire and deleting vats like I already did but I dont see a yellow/black wire. Dont know where to start looking for the problem

 

To properly diagnose an issue like this you need a scanner capable of reading Body codes. You also need to be able to see what's going on in other modules like the BCM.

https://answers.yahoo.com/question/i...1220620AAZ3fj7