CUSTOMER CONCERN DTC P1448 returns intermittently even though the code clears and the IPU fan self-test currently passes. CAUSE Connection checks and the confirmed repair identified an intermittent failure of the Intelligent Power Unit module fan used to cool the hybrid battery. CORRECTION Remove and replace the Intelligent Power Unit module fan, then verify fan operation and confirm DTC P1448 does not return.

CUSTOMER CONCERN The battery warning light is on and the vehicle is not charging. DTC P1634 is stored in the IMA system, with no related ECM code. CAUSE Testing and the confirmed repair identified a failed Intelligent Power Unit module fan. CORRECTION Remove and replace the Intelligent Power Unit module fan, then verify hybrid charging-system operation.