I know that this is an old thread, but just for information purposes:
We had this error code flashing, after we replaced the driver's seat with one from the JY (ours had a tear in it, and the JY one was in good shape.) The airbag had gone off in the truck in JY that we got the seat from. This code is for the pretensioner that's in the driver's seatbelt receiver. If the airbag goes off, the pretensioner (which tightens the seat belt) goes off and tightens the belt. We just swapped the seatbelt receiver/pretensioner from the old seat to the new one. It's one small screw and one bolt, remove the wire, move it over to the other seat. Pretty simple and straight forward, and fixed the problem. Looking closely, you could see that the pretensioner had gone off, so it actually wasn't safe having that belt receiver in the truck...but problem's fixed now.