This code indicates that the PCM has detected a voltage signal from the exhaust gas temperature sensor on Bank 2, Sensor 5 that is higher than the expected range for the current operating conditions. A 'high' circuit reading typically points to an open circuit, failed sensor, or wiring issue causing the signal to default to a high-voltage state. This sensor is most commonly found on diesel vehicles equipped with diesel particulate filter (DPF) and selective catalytic reduction (SCR) aftertreatment systems.
The EGT sensor itself is the most common failure point. These sensors operate in extreme exhaust heat environments and can fail open internally, producing a high-voltage signal to the PCM.
Heat from the exhaust system can degrade wiring insulation near the sensor, leading to open circuits or intermittent connections that cause a high circuit reading.
The electrical connector at the EGT sensor can accumulate corrosion or become loose due to vibration and thermal cycling, resulting in poor contact and a high-voltage signal.
A broken wire in the signal or ground circuit between the sensor and the PCM will cause the voltage to float high, triggering this code.
An internal failure within the engine control module's input circuitry is extremely rare for this code and should only be considered after all sensor, wiring, and connector issues have been definitively ruled out.
Short-term driving is usually possible, but the vehicle may prevent DPF regeneration, leading to progressive soot accumulation. Extended driving without repair can result in a clogged DPF and possible limp mode.
No. PCM replacement is almost never the correct fix for this code. The EGT sensor and its wiring are by far the most common causes. Replacing the PCM without thoroughly diagnosing the sensor and circuit is a costly mistake.
No. The exact physical location of Bank 2 Sensor 5 varies by manufacturer and engine configuration. Consult a vehicle-specific service manual to identify the correct sensor, as confusing sensor positions is a common diagnostic error.
It can indirectly. If the PCM cannot accurately monitor exhaust temperature, it may alter injection strategies or block DPF regeneration, which over time can lead to increased fuel consumption and potential aftertreatment system damage.