ELECTRIFIED VEHICLE CONTROL DURING TRAILER TOWING

A system and method for a vehicle having a traction battery, an electric machine, and a secondary power source, such as an engine, operate the electric machine and secondary power source to sustain a state of charge (SOC) of the traction battery when the SOC is either: a) below a first threshold and above a second threshold; or b) below a third threshold; and to deplete the SOC of the traction battery when the SOC is between the second and the third thresholds in response to detecting an operating condition associated with high Amp-hour (Ah) throughput of the traction battery, such as towing a trailer. The system and method operate the electric machine and the secondary power source to deplete the SOC when the SOC is above the third threshold and sustain the SOC when the SOC is below the third threshold when the condition is not detected.