8.4 inch Radio NO REAR SPEAKERS

[Spookhil1963]

Is this truck still under warranty? It sounds like we are past the easy stuff, like someone forgot to plug them in or that they are blown. Assuming under warranty, take it to the dealer. That is what warranties are for.

Out of warranty

 

[Quint]

Gotcha. As others have said, it would helpful to know year and trim level of your truck. Also describe your radio headunit. Is it a 12" screen, an 8.4" screen, or a 5" screen. If you can't pinpoint it using the AlphaOBD, you'll need to test the wiring. IMO it's either one of three things: 1) a problem in the headunit/program, 2) a problem in the wiring (less likely), 3) a problem with all four speakers (unlikely). I say unlikely for the last two because it's hard to believe that all four speakers are not just blown but dead, and that the wiring to all four speakers is bad. It could be a problem from the headunit to the ANC (if you have one), which is why it's still a possibility.