pewter99

Has anyone experienced a problem with having something welded on your car and it affecting the PCM??

I was reading this on another site about disconnecting the PCM if any welding needs to be done that disconnecting the battery was not sufficient.

Any experiences??

John Shiels

I have a large truck ( no computer) and forgot to disconnect the battery and started to smell plastic. It was the wiring harness by the rear tailights. Disconnect it! Not sure if you need to disconnect the computer but you better find out for sure.

Wah

From what I know with vehicles w/o computer, the battery needs to be disconnected. This is for electric welder, the acethylene welder should not affect anything electronics.

SpeedyZ

I just do a LOT of welding and plasma cutting on a Z06 rear with no problems. I didn't unhook anything and it still starts and runs fine. I think the key to welding on a vehicle it to make sure your welder ground is attached to what you are welding on and close to where your welding. Don't clamp your welder ground on the vehicle frame when your welding the exhaust. Don't clamp your welder ground to the engine when welding on the frame. Clamp your ground to what your welding and you shouldn't have any problems.

Scubanme

I did some MIG welding myself on my exhaust and it has no issues at all

Bill Dearborn

If not grounded properly any of the electronics are at risk of electrical overstress. By pulling the battery ground strap you can keep this from happening. A friend took his Mercedes to a relative's shop for some welding work. When he got it back the radio and another electronic part no longer functioned.
Bill

EdsC6Z06

You should definitely disconnect the battery ground when welding. You shouldn't have to disconnect the actual pcm, but I would wait 30 minutes or so after the battery disconnect to make sure the backup power to the pcm is shut down.