Apr 5, 2019 — Had the DEF heater replaced today, that cleared the P21DD and ... Essentially, it's a limp mode with a progressive countdown to the next stage ...
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p21dd-duramax-limp-mode
May 7, 2019 — I saw on other forums that the truck may go into "limp mode" if I drive it? Has anyone dealt with this issue out there, I have other dealerships 250 .... Keep the car in a lower than normal gear (use 'S' on an automatic) in order to keep the revs up. I had a P21dd - reductant heater 1 current low code. Page 1 of 5 - .... Jul 31, 2017 — Normally a DEF heater failure will cause the CEL to illuminate and a P21DD code to be signaled, but in some cases the CEL will not illuminate. 3925e8d270
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