Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
A common problem is the big plug that all of the coil packs tie together to which links it to the rest of the harness. I would inspect grounds for that section of the harness along with the fuel injector portion.
Plugged Cat on that side. This would make an entire bank misfire as well.
Please reply to this if you need more help. If you are satisfied with my service, please rate at the top of the screen. Rating does not close out your question. Remember, sometimes it is difficult to completely diagnose your vehicle without being there, but I will try to give you the best answer I can. If I am not giving you 5 star service, please let me know what I missed.
ASE Master Technician
Yes I know it is a diesel engine, you have misfires on an entire bank on the drivers side. Have you check the catalytic converter on that side?
Have you had this scanned for codes?
A timing issue could affect an entire bank.
I am afraid I am not going to be much help on this, I am going to opt out another expert will help you shortly. Please do not reply to this message because it will lock this question back to me.
Hello my name is ***** ***** I'll be happy to help you today, if you have power on the two pink wires of the FICM ckeck also the ground wires on the FICM they are the black/yellow wire and the black/green wire make sure you have good ground on those, if the power and ground on the FICM are very good then make sure all the connectors on the injectors on that bank are good and secure which I see you already did if everything is good and secure and there are no other grounds on power wire in the vehicle loose, with the engine running try to check if there is power in the orange/black wires on each injector of that bank that is misfire but check for power while the engine is missfiring on that bank, if there is no power on orange/black wire on each injector while missfiring then the problem is internal in the FICM and is not supplying 12 volts for the injectors on that bank, you will need to replace the FICM.
I apologize for the delay you will have to check then ohms on the harness from ecm and from ficm to injectors and to the injectors, but let me put the question back in the list to see if another expert can help you, do not reply to me because it will keep me lock in your question.
Hi my name is***** will be glad to help. What is the serial number Duramax? LLY?
P0380 code means that the PCM has detected a fault in the glow plug/heater circuit "A".
Potential causes for this DTC may include: Fault in glow plug wiring (open, short to ground, etc.)
Glow plug faulty
Faulty glow plug relay
Faulty glow plug module
Click this link below for the 301-308 troubleshooting and diagram. Let me know if there is trouble accessing the file
Thanks for the update. That narrows things down to either a harness problem or failed injectors which will cause the FICM to shut down the problem bank. I see you changed the injectors already as well. Were these new, used, or reman? I would take a closer look at the wiring harness and run some continuity checks. Let me know
Most likey it will be a problem in the harness but it could be possible and ECM issue if you have confirmed all other possibilities we went over here. See if you can obtain a test ECM or have the existing one reflashed/reprogrammed and see if it will successfully take a reflash.
As long as the other truck matches all options to the tee it would be okay but it is best to program for your VIN to avoid any headaches.
usually swapping an ECM is okay for test purposes but you should always have the programming done to match your truck
Hi, Sorry for the delay. Experts are not employees of the site. I help on here in between jobs as time allows. I have been out on the road this week and will be tomorrow as well. Use an OHM meter to test pin to pin for continuity of the harness. should be close to zero OHMs for a good reading of continuity. Click on this link I uploaded for you and see PDF page 75 on for the diagrams and pinouts. Let me know
Hi, Did you get this resolved?
Thanks for the update and glad to you got this resolved.