Troubleshooting Volvo v70 Check Engine Light and Error Codes

I'm experiencing some issues with my Volvo v70. The Check Engine light has been on for a while and the car recently went into limp mode. I managed to clear the codes and it seemed fine for a while, but then the Check Engine light returned, though without the limp mode. The error codes I've received are 210100 (TAC), 2009: IMRC circuit low (bank 1), 00EC: IAT sensor 3 circuit intermittent/erratic (bank 1) - General electrical faults, 6C2101, C40168: invalid data received from ECM/PCM A - algorithm faults, and C30141: Software incompatibility with ECM/PCM. I'm unsure of how to proceed with troubleshooting these issues. Any advice or tips would be greatly appreciated.

Start by checking the wiring and connectors related to the Throttle Actuator Control (TAC) and the Intake Manifold Runner Control (IMRC) for any signs of damage or corrosion. Ensure all connections are secure. This could resolve the 210100 and 2009 codes. After inspecting, clear the codes and see if they return. Let me know how it goes or if you have further questions!