One problem related to brake sensor has been reported for the 1999 Jeep Grand Cherokee. The most recently reported issues are listed below.
Fuel/propulsion: the vehicle will run after starting for 5-8 minutes then the rpm's drop to 300 and acts like its going to stall; then. The car begins bucking, jerking, and revving up. There are loud clunks from the engine compartments. I have replaced the cam & crankshaft sensors, throttle position sensor and no change yet. Next I am going to replace the fuel pump, filter, the fuel line between them. Air bags: the airbag light goes on and off. The only fix I have read about is the clock spring. . . Talk about money pit!! brakes: yes. Front brakes have locked up and caused issues. Discs and calipers have been replaced. Also, driver's side break light is not functional. The tail lights work, but once the brake is depressed, the right and top lights work, but the driver's light is off. And just for fun. . . I've had to replace both side mirrors due to internal springs failing as well as both front window regulators and motors. When I went to autozone to get parts, they correct window regulator was under the 2000 model year; 1999 did not fit. We are gonna get rid of this Jeep. . . Chrysler needs a lesson in taking responsibility. We'll buy a Toyota.