I have my truck down for the last 3 months and it's my work truck - I desperatedly need help since 3 mechanics were not able to find out the problem.
I have a 08 GM truck with the 6.2L Vortec and 6-speed.
The truck goes into "reduced engine power" and displays the codes P0315, P2119, P2135.
Here is everything I have done and paid for in the last 3 months and the details:
1) Changed my battery to a brand-new one;
2) Changed my fuel pump to a brand new GM original assembly;
3) Changed my throttle body assembly from my old GM original to a Hitachi:
- The old TB assembly would not work at all and so I got this Hitachi which lets me drive the truck a little bit if I don't step on the pedal too much (until half of the pedal) but as soon as I push the truck a little more it goes back into limp mode;
- I changed the Hitachi TB assembly into a brand new GM original assembly and it goes back to not working AT ALL: it stays in limp mode from the get go with the new GM original TB assembly (in other words, the truck just 'kinda runs' with the Hitachi TB assembly but goes into limp mode after you push it);
4) I changed my ECM to a remanufactured GM ECM that's already programmed to my VIN and the key has been paired to it (the new ECM is working properly).
All the mechanics that touched it say that they checked all the grounds going to the TB and even bypassed a direct wire from the battery to the TB to see if that would make it work temporarily but the same problems described would come back (it would 'kinda work' with the Hitachi assembly and not work at all with the old or brand new GM original assemblies).
They say they checked all grounds and fuses and it's all in order.
I'm attaching 2 pictures (code and graph) for your reference.
Codes: https://ibb.co/s6dLtdx
Graph: https://ibb.co/sqmWDM5
Please, please help me! I need to get my truck back since it's hurting my job!
Thank you in advance!
"GM truck" covers a lot of territory. What is the specific model?
Have you or your mechanics checked for TSBs? For example, this one for a number of GM trucks with that engine:
@chucktobias it's in his attachments. H2 Hummer.
@chucktobias Also, I pointed out that I have already replaced the entire throttle body assembly and therefore the bulletin doesn't really help me (as it instructs to change only the TP sensors).
That was just an example. The point is that when reaching an impasse with a problem it's worth checking to see if it's something the manufacturer knows about and has documented.
@chucktobias thank you - I will have a look around. I just don't know what else to do and I'm quite concerned :/
Here's one place you can check for information:
If you do a search by make, model, and year, in addition to recalls you'll find investigations, complaints and manufacturer communications. It's worth a shot in case you're dealing with a known problem with that model.