I have been reviewing posts on the timming chain and on the P0300 error code that have been posted here, Primarily the three:
(3) Random Misfire P0300 | GM Volt Forum (gm-volt.com)
(3) CEL P0300 error code - Random/Multiple Cylinder misfire | GM Volt Forum (gm-volt.com)
(3) 2012 P0300 Random...
Just recently bought a 2012 Volt (this past February) after reading tons of threads on this awesome site. I really like the car!
170K on mostly the engine (30 lifetime MPG)
3 DTC Codes: P0131, P0137, and P0420
Changed Oil, Spark Plugs, and Air Filter
No mods except...