Engine shut off will not start, multiple codes

2003 GMC YUKON
158,121 MILES • 6.0L • V8 • 4WD • AUTOMATIC
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KENNETH SIERRA
  • MEMBER
  • 1 POST
just quit running at light. wont start, reduced engine power on cluster. codes p120, p220, p1516 and p1518. tried clearing codes scanner erase done but codes still there.
Sep 23, 2019 at 11:15 AM
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JIS001
  • ✓ASE Certified Mechanic
  • 3,412 POSTS
  • ASE Certified Mechanic
Hello and welcome to 2carpros. First thing you need to do is remove the throttle but do not disconnect the connector. Get some throttle cleaner and spray it on a clean lint free towel and clean out the the throttle body. Here is a quick link.

https://www.2carpros.com/articles/throttle-actuator-service

After cleaning out you will need an advance scan tool to do an idle relearn. A dirty throttle body will set these codes and cleaning it is your first step before replacing any parts. If after cleaning you still have issues then you will need a good scan tool with live data so we can see what is going on. Please keep us updated
Sep 23, 2019 at 10:55 PM
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