Chevrolet Monte Carlo reduced engine power light on after radiator replacement on Chevrolet Monte Carlo

Some Chevrolet Monte Carlo owners report experiencing the "Reduced Engine Power" warning light after a radiator replacement, which may indicate issues related to engine management sensors, the ECU, or system failures. This warning typically suggests that the engine is not receiving vital telemetry needed for proper control, leading to reduced throttle response and potential fuel pump shutdown due to the Powertrain Control Module (PCM) intervention. When this message appears, owners are advised to safely pull over, turn off the engine, wait a few minutes, and then restart the vehicle. Additionally, problems with sensor connectors, the throttle body, or the Throttle Position Sensor (TPS) may arise, particularly if these components were recently installed. The warning could also stem from issues in the throttle, fuel system, emissions components, or other critical engine parts. It is crucial for owners to address the underlying cause of the reduced engine power warning to ensure their Chevrolet Monte Carlo functions properly, and if the issue persists, consulting a mechanic or dealership for a thorough diagnosis is recommended.