Sorry I took so long. Emails stopped sending to me. What’s year model of cobalt miles condition and how did you treat it before hand
Thanks for the reply.give me little more details on its condition before it starting. Did you just work car it or treat it like it was a million dollar BMW? there are several reasons I found, and when I dug into all at once plus adding a self powered/forced ground toggled by a toggle switch I resolved everything within the vehicle and have since drove an additional 5200k miles. Most I get is a bog upon heavy braking and I assume it’s from the fuel filter being GM original. I bought a salvaged rebuilt 06 LT coupe with 148k on the cluster. A loose piece of shit battery terminal coming loose caused a power line to slip and touch the vehicle frame still energized and zapped the weakest ground within the vehicle which was fixed and I assumed heavily damaged my fuse block Which has proof of heavy damage. 33 year GM/ ASE certified grandfather helped me fix everything, and I found everything he didn’t understand threw the internet. Which found the way to my cobalt turning over again. Give me symptoms, miles, car condition care to vehicle and state you live in and I’ll help you locate you’re issue
thanks for the reply. have replaced all fuses and checked all grounds. I think this has to be a problem with my canbus system because i found when i test ohms across pins 6 and 14 at DLC i read 8 ohms, it should read 60. When i remove the BCM i get 120 ohms so i thought this meant the BCM was bad, got a replacement to check and this is not the issue either. If anyone can give me some thoughts on what it means when testing the DLC I have 8 ohms across 6 and 14 and also 120 ohms across 6 and 14 with BCM unplugged would be helpful. thanks.fyi. my 2007 g5, twin of the cobalt, g. i did all the grounds in engine bay, added extra ground wire to pcm. but goes wonky every few months to a year....lose commuinication to ecu, fuel needle goes awry, power steering messages etc.
mostly starts and drives but seems to downshift when ever it wants, rpms jump all over the place and becomes undriveable.
solution was to replace 10 amp fuse and/or clean the 10 amp fuse and clean terminals in the fuse panel n fuse box passenger side which is #25 Engine Control Module, Transmission Control Module 10amp fuse.
clean with a fine grit sandpaper even though there were no signs of corrosion in fuse box terminal or fuse. once i do this problem goes away for months at a time but dont forget to recheck the engine bay grounds