The CEL will go out, but the last code will still be set. Going to the dealer or the Autozone will provide the code. Even if the dealer doesn't have experience with the CRD, getting the code will not be a CRD specific issue. Hence, they should be able to diagnose the problem. Now, fixing the problem will be a new experience for them, but at least it is still under warranty.
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Steel Blue 07 Jeep Grand Cherokee CRD

Mopar Skid Plates/GDE Programmer/Fumoto Oil Valve
80K+ miles & still smiling

Sold: Silver 06 Jeep Liberty Sport CRD