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