Express & G-Series Vans Offered in both a full size van, or a large box truck, the Express is the modern GM workhorse

Chevrolet Express
Platform: GMT Van

ECM Code P21DD

Old April 16th, 2019, 12:04 PM
CF Junior Member
Thread Starter
Join Date: Sep 2018
Location: Washington State
Posts: 47
Likes: 0
Received 0 Likes on 0 Posts
Default ECM Code P21DD

Good morning,

My 2015 Express EWB w/ 6.6L Dmax (LGH) threw the reductant heater code, P21DD, yesterday. I wanted to make sure those of you with a Chevy diesel are aware of the Special Coverage Bulletin No.: 29400-01 dated: November 2017 specifically extending the warranty on this item to 120,000 miles as a known issue; there's even reimbursement for those who have paid out of pocket to correct the issue. Chevy Special Coverage
haznavy is offline  

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to and affiliated sites.
  • Ask a Question
    Get answers from community experts
Question Title:
Your question will be posted in: