U0692 indicates that the vehicle’s control module has detected a loss of communication with the exhaust pressure sensor B circuit. The PCM cannot receive valid data from this sensor, which may affect emissions control and engine operation.
The sensor may have an internal fault that stops it from sending a usable signal, causing the PCM to report a lost communication.
Corroded, broken, or loose wiring and connectors between the sensor and the PCM can interrupt the signal.
A short, open, or high‑resistance condition on the CAN lines affecting the sensor’s data bus can cause loss of communication.
A failure in the PCM’s CAN transceiver or related circuitry can prevent it from receiving sensor messages, though this is less common.
Occasionally a PCM software glitch can misinterpret sensor data, but it usually resolves after a re‑scan or update.
No, in the majority of cases the problem is a faulty sensor, wiring, or CAN bus issue; PCM replacement is rarely necessary.
The vehicle can usually be driven short distances without immediate damage, but it may affect emissions performance and should be repaired before an emissions test.
No, exhaust pressure sensor B measures the pressure in the exhaust system for emissions monitoring and is distinct from boost sensors.
A standard OBD‑II scan tool that can read manufacturer‑specific codes and view live data is sufficient for initial diagnosis.