Chevrolet Volt cabin heating issue possibly related to coolant bypass valve position sensor DTC P26A9 on Chevrolet Volt

Some Chevrolet Volt owners report experiencing cabin heating issues related to the coolant bypass valve position sensor DTC P26A9. These problems may be indicated by the engine light being illuminated, which could signal a faulty Engine Coolant Bypass Valve Position Sensor or wiring issues. Additionally, the P26A3 fault code, associated with the engine coolant bypass valve, may also trigger the service engine soon warning light. A blocked coolant bypass valve can further prevent hot coolant from flowing to the heater core, leading to a lack of cabin heat during certain driving conditions. To address these concerns, owners are advised to visually inspect the wiring harness and connectors for damage, troubleshoot the P26A9 fault code for any electrical issues, and replace the faulty Engine Coolant Bypass Valve Position Sensor if needed to restore proper cabin heating functionality.