U0622
Lost Communication With Exhaust Gas Temperature Sensor Bank 2 Sensor 2
The vehicle bus reports loss of communication with smart exhaust gas temperature sensor bank 2 sensor 2 (typically post-cat). Catalyst protection and DPF regeneration logic switch to model-based estimates.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Common causes
Ordered by how often each turns out to be the cause.
- Bus wiring open or shortedCommon
- Module without power or groundPossible
- Module failedPossible
Parts involved
- Egt Sensor Bank 2 Sensor 2
- Vehicle Bus Wiring
U0622 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.