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P242D Severity
Once the vehicle's onboard system no longer detects the issue, most codes will disappear on their own. If your vehicle still has this code, however, it should be properly diagnosed to avoid a more serious problem.
For a proper diagnosis, RepairPal Certified shops have the equipment, tools, and expertise.
Moderate severity codes might not threaten the vehicle's safety or functionality immediately, but you should still get it diagnosed within a reasonable time frame to keep your car running well.
The Exhaust Gas Temperature (EGT) Sensor tells the engine control module (PCM) the temperature of the exhaust gas going into and out of the Selective Catalytic Reduction (SCR). If the PCM detects an implausible signal from the EGT sensor, it will store code P242D.
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OBD-II Code Powertrain Control Module (PCM) failure is defined as a Exhaust Gas Temperature Sensor Circuit High
The Exhaust Gas Temperature (EGT) Sensor tells the engine control module (PCM) the temperature of the exhaust gas going into and out of the Selective Catalytic Reduction (SCR). If the PCM detects an implausible signal from the EGT sensor, it will store code P242D.