I have a 2011 chevy hhr. Ecm problem. I turned key to on and pulled fuse , put fuse back in and car started and shut down in a few seconds
The manual simply refers to using a scan tool. If you have a specific code post it in comments below.
ENGINE CONTROL MODULE (ECM)
| Connect EL-49642 Service Programming System (SPS) programming support tool, or suitably programmed scan tool to Data Link Connector (DLC) located under lefthand side of instrument panel and follow on screen instructions |