2000 Sierra Only Runs In Park

By Hambone!
September 18, 2011 in Ask A GM Technician

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Hambone!

Posted September 18, 2011

Have an odd problem with a 2000 Sierra 2500 6.0. It will start and run in Park only. Shift from Park and it quits. It will crank in Neutral but not start. The IGN 1 relay cycles every time the shifter leaves and returns to Park. Also, the 4L80E reports being in 2nd regardless of the shifter position. Could be a missing ground? An open? Troubleshooting time is short, so insight would save me lots of time here. Every fuse is intact. If the trans is in limp mode, how do you find out what caused it? And would that cause the engine to quit? Grrrrr.

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