This code indicates the exhaust gas temperature (EGT) sensor on engine bank 2 is detecting temperatures above the calibrated threshold, or the sensor circuit is generating a high-voltage signal. Bank 2 refers to the side of the engine that does not contain cylinder number one.
The sensor itself has failed internally, often developing high resistance or a short circuit that causes it to report an erroneously high temperature to the PCM.
The sensor signal wire is shorted to a voltage source due to chafing against exhaust components, heat damage, or corrosion in the connector.
A clogged catalytic converter or diesel particulate filter is creating excessive backpressure and genuinely elevating exhaust temperatures upstream of the sensor.
Severely lean air-fuel mixtures, advanced ignition timing, or post-injection issues can raise exhaust temperatures, though these conditions usually affect both banks or set additional codes.
Rarely, the powertrain control module misinterprets a normal sensor signal due to internal analog-to-digital converter failure or reference voltage bias.
Short trips are generally acceptable, but continued operation risks damaging the catalytic converter, turbocharger, or diesel particulate filter substrate if exhaust temperatures are genuinely excessive. Diagnosis should be performed promptly.
Almost certainly not. Despite common misdiagnosis, PCM failure is extremely rare for this specific code. The root cause is almost always the sensor itself, wiring damage, or an actual high-temperature condition in the exhaust stream.
V-configured engines have two cylinder banks. Bank 2 is the side opposite cylinder number one. This code isolates the problem to the exhaust stream from that specific bank, distinguishing it from Bank 1 issues.
Not necessarily. While a clogged converter can cause genuinely high temperatures that trigger this code, the sensor itself or its wiring is equally likely to be the culprit. Proper diagnosis distinguishes between an electrical fault and an actual overheat condition.