P242B Possible Causes
- Faulty Exhaust Gas Temperature Sensor (EGTS), Bank 1 Sensor 3
- Exhaust Gas Temperature Sensor, Bank 1 Sensor 3 harness is open or short-circuited
- Poor electrical connection in Bank 1 Sensor 3 circuit of the Exhaust Gas Temperature Sensor
- Exhaust leaks
- Excessive particulate buildup on the sensor
How to Fix Code P242B
Check the “Possible Causes” listed above. Visually inspect the wiring harness and related connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
P242B Possible Symptoms
Engine light on (or service engine soon warning light)
P242B Meaning
The Powertrain Control Module (PCM) continuously monitors the Exhaust Gas Temperature Sensor (EGTS) for proper circuit continuity and out-of-range high values. The EGTS is located in front of the Diesel Oxidation Catalyst (DOC) and/or in front of the Diesel Particulate Filter (DPF). The EGTS detects exhaust gas temperature and converts it to voltage, then sends it back to the PCM with the voltage signal to control engine conditions for effective emission reduction. The PCM sets the OBDII code P242B when the Exhaust Gas Temperature Sensor is outside factory specifications.