Update I replaced wire harness nd vvt solenoids it had Dorman solenoids in it put about 400 miles on car done plby 40 stops an car doesn't shake jump rpms or stall anymore at stops so we moving in right direction but car still got codes for same things lol nd shift points or off nd car still under powered on hwy takes forever to get up to speed nd shift sometimes I have to let off for it to shift so what's next oem o2 sensors an test wires for sensors?

 

Check for transmission codes

 

Had one code for transmission I'll have to go back nd look at scanner again to see what code will update tomorrow thanks for all the help guys we making progress lol

 

Update after driving an scanning car only 2 codes now 1 for transmission nd 1 for brakes P1818 c029_1a how do I fix these 2 codes 🤔 car seems to not shake jump or stall anymore I really appreciate the help car been huge money pit nd pita lol

 

For that P1818 code
https://www.chevyhhr.net/forums/prob...ht-went-49115/


as for the C029_1A I’m not finding anything for an HHR for that code.

 

Update over 1000miles nd passed state inspection no problem no codes but something worng with transmission shift points are all over place doesn't shift unless I let out nd now doing 70mph I'm at 4500rpms nd it won't shift lol I held it 3 minutes and it would not shift even when I let off what in the hell is up with this car nd when I leave stop its in 2nd not first takes forever to get going could walk faster then this thing takes off

 

There must be transmission codes.

plausible the fluid transfer pipes above the transmission filter has developed a crack, it could be the torque converter control solenoid, damaged wires or low fluid level.

 

They probably don't consider tranny for inspections.
He should scan the TCM

 

Explain the procedure.

 

You scan the TCM with a scan tool or even a code reader that supports the module.