Code Definition

P242C — Exhaust Gas Temperature Sensor Circuit Low, Bank 1 Sensor 3

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P242C

P242C is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P242C is stored, the module has detected a signal or supply voltage lower than the expected operating range; a bank-specific fault, meaning it applies only to one cylinder bank of a multi-bank engine; and a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P242C is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

DTC P242C indicates the exhaust gas temperature sensor circuit for Bank 1 Sensor 3 is reading low, with the signal voltage below the minimum calibrated threshold. Exhaust gas temperature sensors monitor temperatures through the exhaust aftertreatment system so the module can protect the catalyst and diesel particulate filter and manage regeneration, and Sensor 3 is one of these in the Bank 1 exhaust stream. The code sets when the sensor signal voltage stays below the valid window for a set period, which corresponds to a short to ground, excessive circuit resistance, or an internally failed sen...

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