P0438 - OBD II Trouble Code

Our automotive experts have put together the following information about the P0438 diagnostic trouble code. We've provided the common symptoms that occur when this code is set along with the frequent repairs that address the issues related to the P0438 code.

OBD II Fault Code

• OBD II P0438

OBD-II Code Catalytic converter temperature sensor failure is defined as a Catalyst Temperature Sensor Circuit High

The Catalytic Converter uses multiple temperature sensors to ensure that the Catalytic Converter is working properly and does not overheat. When the engine control module (PCM) determines there is an incorrect signal from the Catalytic Converter Temperature Sensor, the PCM will set code P0438.

Common Problems That Trigger the P0438 Code

• Catalytic converter temperature sensor failure
• Powertrain Control Module (PCM) failure
• Wiring issue