The only way it will start is if you hold the gas all the way down & then it dies. I have replaced the camshaft sensor, crankshaft sensor, the fuel pump, and the throttle position sensor. I'm now at a loss on how to get my truck back on the road, any suggestions would be appreciated. The codes that come up on my handheld scanner are: C0561 - ABS serial data..., C0299 - ABS brake booster pressure sensor..., P0068 - ECM Manofold Absolute Pressure/Mass Air Flow - throttle position correlation, P0102 - Mass or volume air flow A circuit low input, P0300 - ECM Random - multiple misfire detected, P0609 - ECM control module vehicle speed sensor output B malfunction, P0102 - Mod Mass or volume air flow A circuit low input, P0300 - Mod Random- multiple misfire detected, P0420 - Mod catalyst system efficiency below threshold bank 1, P0430 - mod catalyst system efficiency below threshold bank 2
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Make sure there is no foreign material caught in the mass air flow sensor .. Even a tiny piece of trash will cause askew readings. .. There are too many codes - it is likely during the work that has been done - several of the present codes were inadvertently induced .. Also check for ANY possible air leaks between MAF and intake plenum.
Suggest clearing codes - then try to operate engine until another code is gathered .. Then use that code for reference.
This could be an issue with the factory security system. Considering you have already spent a lot of money and time here I would really suggest biting the bullet and bringing it to a shop. I would hate to take a stab at another part and have it not fix your truck. Here is a link to find a shop near you. Hope you get her back up soon.
https://repairpal.com/repair-shops
Alex
Hi everyone,
I had the same problem as you, the engine will crank but won,t start. I had to get it towed 20 miles to bring it home and I thought that I have a look at it with my friend who happens to be a mechanic. We went to the fuse box under the hood and checked for power at fuse position 22 (FCSM) and the fuse was in an open state but the funny part is that it wasn’t blown, it was corroded to the point it could not sustain the current going through it and then it blew. We put in a new fuse with a bit of dielectric grease on the prongs and the truck runs as good as before. If I can, I,ll show a picture of the fuse. I hope this may help someone, cheers.
Can’t load images on this site - unfortunately..
Here is a diagram of the fuse boxes :
https://www.autogenius.info/gmc-sierra-2009-2013-fuse-box-diagram/
FCSM is actually fuse position 21
Just a reminder here > the very FIRST thing to do anytime an electrical problem occurs is *TEST* the fuses using a simple test light - - ALL FUSES!
I guess I always assumed that was a routine first step even for a diy diagnosis.
However there are certainly many more possibilities for a no start condition.
Thanks for sharing your experience here - very good suggestion !
Local auto repair facility can likely make a house call - if necessary.
I have a scanner & updated my question with the codes.
Make sure there is no foreign material caught in the mass air flow sensor .. Even a tiny piece of trash will cause askew readings. .. There are too many codes - it is likely during the work that has been done - several of the present codes were inadvertently induced .. Also check for ANY possible air leaks between MAF and intake plenum. Suggest clearing codes - then try to operate engine until another code is gathered .. Then use that code for reference.