U068DLost Communication With EGR Temperature Sensor A
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- EGR temperature sensors show how hot the recirculated gas is, mostly behind the EGR cooler, so the controller can judge cooler efficiency and correct the gas density. U068D is the digital-link failure for sensor A. No public manufacturer source covers U068D. In the published tables sensor A is analog: GM's 2025 diesel table 25OBDG04A calls it the downstream EGR temperature sensor 2 and flags a resistance below 159 ohms as P040C, and Ford's 2023 diesel summary sets P040C under 0.69 V and P040B if the reading rises less than 10 °C after start. Neither has a SENT variant for A. CARB requires the EGR cooler to be checked and a separate code for any digital input that goes quiet. Analog faults are P040A to P040E; the A/B comparison is P040F.
- What you may notice
- Check engine light
- EGR cooler monitoring not possible
- Likely causes
- LikelyWiring to EGR temperature sensor A damaged near the cooler
- PossibleConnector oily, sooty or corroded
- PossibleSensor electronics failed
- 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: €50 – €350
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.