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P21DD code after changing rear brakes.

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I left the repair shop with new pads, rotors and one new caliper. The old caliper had stuck. After I left I noticed the code P21DD (DEF tank heater?). Could they have done something to cause this? The car has 96k.
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With the tank inside the trunk on the first gen cars I'd doubt it is related.My memory is a little fuzzy from last time I was looking under the car at the feed tube and can't recall if the wiring harness also runs under or through the inside of the car, but if they damaged the heater wiring it probably would have taken out the pump, fluid level, etc. which I think is in the same bundle.
 
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