This code indicates the Powertrain Control Module (PCM) has lost digital communication with the Exhaust Gas Temperature (EGT) sensor located downstream of the catalytic converter on engine bank 2. The sensor transmits temperature data via a LIN or dedicated serial bus circuit, and the PCM can no longer establish valid contact with this specific device.
The internal electronics of the temperature probe commonly fail due to extreme exhaust heat and thermal cycling, causing a complete loss of LIN bus communication with the PCM.
Opens, shorts to ground or voltage, or chafing in the LIN bus signal line, power feed, or ground circuit between the sensor and PCM connectors frequently occur due to proximity to hot exhaust components.
Moisture intrusion, terminal corrosion, or backed-out pins at the sensor or inline harness connectors interrupt the digital signal path required for communication.
Aftermarket exhaust work may disturb or melt wiring, while upstream exhaust leaks can cause abnormal heat exposure that damages the sensor element or connector.
Rarely, a software glitch or failure of the internal LIN bus driver within the PCM prevents communication, but this should only be considered after verifying the sensor and all wiring are functional.
Short-term driving is usually possible, but if the vehicle relies on EGT data for particulate filter regeneration or turbocharger over-temperature protection, continued operation may risk catalyst or turbo damage; repair should be scheduled promptly.
Almost never. This code specifically indicates a communication breakdown with one sensor; the fix is almost always the sensor itself, its wiring, or connectors. PCM failure is extremely rare for this specific fault and should not be replaced until all other causes are ruled out.
Bank 2 refers to the cylinder bank opposite cylinder 1 (typically the passenger side on V-configured engines), and Sensor 2 is the EGT probe positioned downstream of the catalytic converter on that specific bank.
No. While intermittent connection issues might temporarily restore communication, the underlying fault will typically return until the failed sensor, damaged wiring, or poor connection is permanently repaired.