U069BLost Communication With Exhaust Gas Temperature Sensor Bank 1 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 the fourth temperature point along the bank 1 exhaust. Of GM's 2025 diesel tables only 25OBDG04A contains U069A's partner U069B; 25OBDG04B ends at sensor 3. The logic is the same SENT check as for sensor 3, 19 bad samples of 25 at 100 ms after the sensor's start-up delay, Type A. What differs is the role: in the second stage of GM's hydrocarbon dosing control (P144E) EGT 4 supplies the temperature ahead of the filter, so losing it disturbs regeneration. GM rates an open or high circuit on this probe (P2471) as Type A. Ford's 2023 diesels read sensor 4 as an analog probe (P2470/P2471) and check it against the other sensors after a cold start (P246F). Sensience offers such probes with SENT or CAN output.
- What you may notice
- Check engine light
- Regeneration interrupted or not started
- Likely causes
- LikelyHarness to sensor 4 damaged by heat during regeneration
- PossibleSensor electronics failed
- RareConnector corroded
- 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.