You need to read the ‘How to repair the relay control module‘ thread in the TSBs and How to forum.
It tells how to fix the poor soldering if that is the problem and what the burnt contacts on the RCM look like.
Cleaning the contact faces is not really the best cure, a new relay is the top fix.
This code can also be caused by bad grounding of the wire from the pump, or a bad pump. Usually it is the contacts.