U069CLost Communication With Exhaust Gas Temperature Sensor Bank 2 Sensor 3
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- U069C refers to the third temperature probe in the bank 2 exhaust path, so it can only occur where each cylinder bank feeds its own aftertreatment line, as on some V engines. Such a probe is a digital unit that reports its reading as SENT or CAN frames; the code is stored when those frames stop or keep failing their checks. No manufacturer documents U069C publicly. GM's 2025 diesels have one bank and test only the bank 1 positions, declaring a probe lost after 19 bad samples within 25 and rating it Type A. Bentley's V8 bulletin 2065698/1 proves that digital bank 2 probes are in use, yet names only the first position (U0621). An analog probe at this spot reports through P2466 to P246A, and the fourth probe on bank 2 has U069D. The MIL and a postponed filter regeneration are the likely consequences.
- What you may notice
- Check engine light
- Filter regeneration on bank 2 postponed or blocked
- Probe shows no value in live data
- Likely causes
- LikelySensor harness on the bank 2 exhaust side chafed or heat-damaged
- PossibleElectronics box of the probe failed
- PossibleProbe has lost its supply or ground
- RareConnector corroded or not latched
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €60 – €450
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.