Chevy GMC speed sensor wiring. Erratic speedometer, transmission shifting. ABS light.

erratic speedo / speedometer transmission shifting issues service brake system soon on dashboard ABS light Check engine light instrument cluster code P0502 speed sensor wiring transfer case speed sensor check this first Chevy GMC Silverado Sierra Yukon Tahoe Avalanche Escalade 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 1999 to present 6.0 liter 5.3 liter hope this helps someone