Hey there I have an 09 Silverado Hybrid & I am wondering if anyone has ever heard of this.

When I drive around town below 30mph the elec engine takes over like norm but about 75% of the time when the elec engine switches over back to the normal engine (6.0L V8) there is a clunking noise that comes from either under the hood or somewhere next to the transmission.

I am afraid of taking it to the chevy dealer because here in some parts of Texas & Oklahoma not too many people come across Hybrid anything except the Prius or Civic Hybrid. I really dont want my truck sitting inside the chevy shop for weeks while everyone scratches their heads.

Also I have a prius (wifes car) and there is never any noises between the transition from elec to gas engine or vice versa.

Thanks for the help.

 

Have you tried to duplicate the noise from Auto-Stop in Drive, and then shift down to Manual "M"?

Good audio quality Youtube posted video works well to get results too.

 

I will try that out, lately the truck doesn't go into elec mode because of the cold weather & me having the heater on.