Codes and repair

2003 GMC YUKON

120,000 MILES • V8 • 2WD • AUTOMATIC

SIA1962

MEMBER
1 POST

Hi,
in front of dash says " reduced engine power" and i just checked the codes and codes P1515-P1516-P1518-P0220-P0120 has appaired. what could be wrong and where i could start to repair?

thanks for info

Aug 13, 2009 at 7:11 AM

SQM

✓Experienced Mechanic
6,383 POSTS

Hello,

One of the most common causes of reduce engine power / limp mode is a dirty or malfunctioning throttle actuator.

https://www.2carpros.com/articles/reduced-power-limp-mode

The codes you are getting typically gets triggered with this type of issue.
First you will need to do a service of the throttle actuator by cleaning out. Many times, just cleaning dirt and debris can improve the performance of the actuator and can take care of the low power mode.

Here are couple of helpful guides:

https://www.2carpros.com/articles/how-a-throttle-body-works
https://www.2carpros.com/articles/throttle-actuator-service

I have attached diagrams for your reference.

Please let me know if you have any questions.
Thank you.

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