Code p20EE, Service emissions message?

Tiny
CKBUMGARDNER
  • MEMBER
  • 2018 CHEVROLET SILVERADO
  • 6.6L
  • V8
  • TURBO
  • 4WD
  • AUTOMATIC
  • 129,000 MILES
I can’t get rid of the service emissions message to go away. It also displays the code p20EE from an obd2 scan. What can I do to fix this?
Sunday, January 26th, 2025 AT 2:59 PM

1 Reply

Tiny
STEVE W.
  • MECHANIC
  • 15,233 POSTS
That code is the reason for the light, it is for the NOX reduction system. It can be caused by a failed converter, but a more common cause is water in the DEF or a frozen DEF feed line. You need to use a good scan tool that has the DEF injection system test. If it passes and is injecting the correct amount of DEF, then the converter may be the issue. Then it is a matter of repairing the defective parts.
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Sunday, January 26th, 2025 AT 6:16 PM

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