Set Condition

WARNING: This page is about a different car, the 2025 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

This diagnostic is designed to detect if the Catalytic Converter is not heating up at the proper rate during a cold start condition. The Powertrain Control Module (PCM) fails the Catalyst Cold Start Monitor if the accumulated time of Catalyst heating effectiveness is below a calibrated threshold for 7.0 seconds out of the 20.0 seconds of monitoring time.