GM Service Manual Online
For 1990-2009 cars only

Hazard Switch Does Not Stay On for GMC Truck GMC P42 Commercial Chassis 1999

Cause

Action

The switch mounting screws are loose.

Tighten the mounting screws.

There is interference with other components.

Remove the interference.

There is foreign material.

Remove the foreign material

Any other cause, excluding the above

Replace the switch.