I have done a lot of work to my 2008 Chevy HHR Lt. It first that for 3 years and I pretty much had to resurrect it. Now I am having ESC and also traction control light come on on dash. Any suggestions would be greatly appreciated.

 

Let me guess. Check Engine Light on also ? If so, then that’s usually the cause of the the ESC and TC lights. Those lights mean the computer has turned those systems off.
You labeled this as electrical issues. Don’t see that.

 

I have had to replace ECM and TCM and problem still exist. It is not all the time, just every now and then, but very annoying. Any suggestions?

 

Scan all modules and give the codes.

 

I wish I had that equipment, but unfortunately I don't

 

Could be damaged wiring from rodents, critters, or varmints. If you can get it to a chain auto parts store, they should be able to scan for codes. I'd call first, some states may have laws against it.

 

I appreciate the input. I guess I'm just going to keep plugging away at it till I figure it out. Thanks.🫡

 

Have you tried to tighten the 4 bolts in the engine fuse box and secure ALL fuses and relays.

 

No I have not. I hadn't thought about that, but I will absolutely give that a try.
Thanks

 

OBD2 scanners are less than $20. Check Amazon, Ebay, Harbor Freight etc.
ESC and Traction Control ONLY, no CEL? Probably a loose connector.
If this is a 2.4L might be failing VVT valves.
Have you got any where near the EBCM? The connectors on it sometimes are loose.
If you changed modules, check the pins in the connectors, they sometimes get pushed out the back of the connector instead of going into the holes.
Could be a loose timing chain.
If it sat for 3 years, varmint damage is a real probability.
Was the Crankshaft Sensor relearned after the ECM was replaced?
TCMs and ECMs don't break on their own, what happened to them ?