Originally Posted by GMBoy
GM supports these codes. Period. I've seen it on them including my own vechicles and have seen it at work on brand new 2020 models. These are generic codes required by governement OBD2 requirements. The GM DTC charts shows them too.
Originally Posted by clinebarger
Originally Posted by GMBoy
Originally Posted by clinebarger
GM does not support individual/specific cylinder misfire DTC's on their gasoline engines, You need to monitor Misfire Data via a scan tool to identify the cylinder/s that are misfiring.
Doesn't matter if One or Multiple cylinders are misfiring.......P0300 will be the only DTC. The Generic Descriptor is misleading!
NOT TRUE! They do use codes P0301,2,3,4,5,6,7,8 etc.
GM does not, Respectfully........As you work at Arlington Assembly IIRC?
I have thousands of GM gasoline calibration files, Not one of them supports P0301 through P0308 in the Master DTC list, Nor have I ever seen a GM gas vehicle set a specific cylinder misfire code.
Because the PCM/ECM doesn't need to.....GM has one of the best live Misfire Monitors in the industry!
The Duramax on the other hand which used a Bosch Controller up until the LP5 CAN set specific cylinder misfire codes, Haven't cracked a LP5 yet.
All due respect my friend but GM supports these codes. Period. I've seen it on them including my own vechicles and have seen it at work on brand new 2020 models. Just saw an Equinox with the code P0303 last month. These are generic codes required by governement OBD2 requirements. The GM DTC charts shows them too.
I'm fully capable of being wrong, If GM has implemented specific cylinder misfire DTC's in the last few years....Okay!
Ford, Chrysler, Toyota, & Honda set specific cylinder misfire DTC's which is a VERY unreliable diagnostic tool because of sympathy misfires among companion cylinders. GM sets a P0300 & you know to use the Misfire Monitor for diagnostics.