GMC Sierra 2500 HD right signal light activates for 3 to 5 seconds and triggers horn on GMC Sierra 2500 HD

Some GMC Sierra 2500 HD owners report experiencing issues where the right signal light activates for 3 to 5 seconds and triggers the horn. This problem may manifest as the right turn signal blinking normally before blinking rapidly, which could indicate a fault in the turn signal circuit. Additionally, a blown fuse in the right turn signal circuit has been known to cause the signal to activate the horn. Owners may also encounter malfunctions due to incorrect installation or faulty bulbs affecting the right turn signal. Furthermore, a faulty multifunction switch, which controls the turn signals and other features, might be responsible for the intermittent activation of the signal light and horn. To resolve these issues, it is advisable to check the right turn signal bulbs for proper installation, inspect the turn signal circuit for blown fuses or wiring issues, and examine the multifunction switch for any faults.