Hyundai Elantra Failure Codes 2007 P1765- P1586

Hello, I have the scan to my car Hyundai Elantra 2007 and these codes come out: P1765: Requirement to reduce torque and P1586: Serial error of the Decoder of at/mt I have investigated on the Internet but I do not find that they mean exactly since specific system affects, the car when stopping it gives a blow in the box I would appreciate them to help me to solve this Cosejos to start, thanks in advance for your comments

Hello regarding code 1765 you have to review the relay (relay) transmission feeding (gearbox) may be damaged or have a false for dirt. and P1586 refers to damaged cable or defective connectors