The Thermo King 2C26664G01 (part 41‑2997) is a V280 controller base used in truck‑mounted refrigeration units to regulate compressor operation and maintain set temperatures. Common failures on this class of electronic control boards include burned or tripped MOSFETs, failed capacitors, and degraded signal conditioning for temperature sensors; a faulty thermostat sensor can also trigger incorrect cooling cycles. Begin troubleshooting by verifying the 24 VDC power supply to the controller, inspecting all input/output connections for corrosion or loose terminals, and checking for visible component damage such as bulging caps or scorch marks. If available, review any diagnostic error codes displayed on the unit’s panel or via its serial interface before proceeding with component replacement.[oss-gpt-20b]