P2472 indicates the powertrain control module (PCM) has detected an intermittent or erratic signal from the exhaust gas temperature (EGT) sensor for Bank 1 Sensor 4. This sensor monitors exhaust temperature to help manage emissions systems and protect components like the diesel particulate filter or catalytic converter.
The EGT sensor itself may be failing, providing intermittent or erratic readings due to internal degradation or damage.
Wiring harnesses or connectors leading to the EGT sensor may be corroded, frayed, or broken, causing intermittent signal loss or noise.
Prolonged exposure to high exhaust temperatures or contamination (e.g., oil, coolant, or soot) can degrade the sensor or its connections.
Inconsistent power supply or poor grounding to the sensor circuit can cause erratic sensor behavior.
Leaks in the exhaust system upstream of the sensor can cause inaccurate temperature readings or signal interference.
While uncommon, a PCM software glitch or internal fault could misinterpret sensor signals, but this is a last-resort diagnosis after other causes are ruled out.
No, the PCM is rarely the cause of P2472. The issue is almost always related to the EGT sensor itself, its wiring, or exhaust system conditions. Replacing the PCM should only be considered after all other potential causes have been thoroughly ruled out.
While the vehicle may still be drivable, prolonged driving with this code could lead to increased emissions, potential damage to emissions control components, or reduced performance. It’s best to diagnose and repair the issue promptly.
EGT sensors can fail intermittently due to internal degradation, exposure to extreme heat, contamination, or wiring issues. Over time, these factors can cause the sensor to send erratic or inconsistent signals to the PCM.
Not always. While a faulty sensor is the most common cause, issues like damaged wiring, exhaust leaks, or poor electrical connections can also trigger this code. Always inspect the entire circuit before replacing the sensor.