GMC Troubleshooting Questions? Ask a Mechanic for Answers
Is the noise just one chirp or a series of chirps?
Does it have anything to do with driving? Bumps, turns, etc? Or would it do it just sitting there idling? What about with the engine off and key on?
I have never seen a chirp from under the dash on this model, unless it is coming from one of the gauges. The motors in the gauges tend to go bad frequently on this truck, but they will usually tick rather than chirp.
I'm not sure if I'll be able to diagnose this one remotely unless you can pin down exactly where the noise is coming from.