Engine trouble codes
 

Good day all,

I'm having a heck of a time with engine codes (P2135,P2176) constantly reoccuring. Of course causing reduced engine power. Not so good on the major highways. Help please! I changed the throttle body already. Thanks!

Welcome to the site!
The P2135 pertains to the throttle pedal, most likely a loose connection per

https://www.obd-codes.com/p2135

The P2176 is addressed here, another loose connection pin in the harness connections

https://www.chevyhhr.net/forums/prob...reduced-42746/

This wire is usually chafed.
Attachment 21634

Many thanks for your pics and advice, This must be a handed down problem from the cobalt, G5 and who knows what else. I guess I'll start here. Trying to keep the faith in North America vehicles.:smile:

The HHR is Saab based, Per

https://en.m.wikipedia.org/wiki/GM_Ecotec_engine

These are stout little trucklets I've got over 380,000 Kim's on mine with no major issues.