I installed the Magnaflow catback system,looks great ,sounds great.A day later check engine light came on? I have not checked the code yet , but does the computer need to be reset for the new exhaust?:pir_flag:

There should be no check engine light issues due to exhaust. Make sure 02s are plugged in and that they were not damaged on removal. I have had mine on since Friday and about 100 miles with all types of driving with no issues. Charlie

if there was welding done and the o2 sensors were not removed they could be toast. try and get the codes read.

There should be no check engine light issues due to exhaust. Make sure 02s are plugged in and that they were not damaged on removal. I have had mine on since Friday and about 100 miles with all types of driving with no issues. Charlie
What is TCM & ECM? Can you tell me how I know what # G8 I have out of first 888

What is TCM & ECM?
TCM = Transmission Control Module
ECM = Engine Control Module
Can you tell me how I know what # G8 I have out of first 888?
:search:
There are MULTIPLE threads on this topic.

What is TCM & ECM? Can you tell me how I know what # G8 I have out of first 888

when will they learn how to search :gr_jest:

And what did that have to do with this thread at all?

I installed the Magnaflow catback system,looks great ,sounds great.A day later check engine light came on? I have not checked the code yet , but does the computer need to be reset for the new exhaust?:pir_flag:

I believe they suggest disconnecting battery so computer can relearn. Be extremely careful to not hose your onstar battery though...

Did you get the code read yet?

when will they learn how to search :gr_jest:

And what did that have to do with this thread at all?

Both seem to be common problems on this forum. VERY annoying.