U066DLost Communication With Charge Air Cooler Temperature Sensor Bank 1
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- The temperature of the charge air behind the intercooler tells the engine controller how dense the intake charge is and whether the cooler still removes enough heat; CARB lists charge air cooler temperature in the data diesel vehicles must report and requires an undercooling monitor in (f)(7.2.4). U066D is reserved for a bank 1 sensor that delivers its reading as a digital frame, for example as the NTC channel of a SENT pressure sensor such as Infineon's KP276. No manufacturer documents U066D publicly: Ford (2024 gasoline, 2023 diesel) and GM (25OBDG04A, Type B) read their bank 1 sensors analog and set P007C/P007D when voltage or resistance leaves its range. Without the value the controller works from a model, and boost may be trimmed.
- What you may notice
- Check engine light
- Slightly reduced power at high load
- Often no noticeable change in normal driving
- Likely causes
- LikelySignal or supply wire to the charge air sensor open or chafed
- PossibleOily or corroded connector at the charge air pipe
- PossibleDigital sensor (often combined with boost pressure) failed
- RareEngine controller input or software fault
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Easy · Often possible to do yourself.Typical cost: €40 – €300
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.