The code is related to the right drive motor field circuit S1 and S2. It could be open or shorted. Disconnect your battery and test the truck side of the connector with your digital meter. Test the + and - to chassis you should have an open circuit. If you have continuity then find your short. You can disconnect the S1R and S2R at the H-BRIDGE and check for open or shorts to confirm wiring or open in motor. You should have continuity across S1 and S2 when they are disconnected.With S1 and S2 disconnected test each to chassis they should be open. If I remember right the right motor is the lower one a little harder to get to wiring. Good luck.