U069DLost Communication With Exhaust Gas Temperature Sensor Bank 2 Sensor 4
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- Sensor 4 is normally the final measuring position in the bank 2 exhaust, often placed further down the aftertreatment where the controller judges how hot the gas leaves the filter or catalyst stages. U069D reports that this digital probe has gone silent on its data link. Code-level documentation from a maker is not public; CARB only demands that a coded digital input which stops talking gets a code of its own. Sensience builds such probes from a type N thermocouple and a control module that handles up to four probes on J1939 CAN or one or two on SENT, so one failed module can silence several positions at once. On bank 1 only GM's 25OBDG04A contains the matching code U069B, rated Type A. Wiring faults of an analog probe at this point use P2473 to P2477, while U069C is the third probe. Expect a lit MIL and regeneration being delayed.
- What you may notice
- Check engine light
- Regeneration delayed or cancelled
- Likely causes
- LikelyProbe lead melted or torn near the rear aftertreatment
- PossibleElectronics unit of the probe dead
- RareSupply fuse or feed wire of the probe faulty
- 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.