OBD-II DTC · SAE J2012
U066E
Lost Communication With Charge Air Cooler Temperature Sensor Bank 2
What U066E means
U066E is a standard SAE J2012 powertrain diagnostic trouble code with the defined meaning: Lost Communication With Charge Air Cooler Temperature Sensor Bank 2. This is the OEM-agnostic definition; specific manufacturer interpretation may add detail (subsystem, bank, sensor location) but the core meaning is consistent across all OBD-II compliant vehicles since 1996.
Common symptoms when U066E is active
Coolant temp sensor MIL, fan stays on / off, thermostat performance DTC, heater core slow to warm.
Can this code be suppressed via ECU tuning?
Whether this code is safe to suppress depends on the underlying cause. Diagnose first, suppress only after confirming the mechanical issue is benign or rectified.
How to remove U066E with Softechpro V5
Recommended service: DTC OFF (cooling branch). Step-by-step workflow:
- Check the thermostat / sensor / fan circuit physically first.
- If the issue is a long-standing nuisance code on an old vehicle, Softechpro V5 DTC OFF can suppress it.
- Load .bin, select cooling DTC group, save, flash.
Softechpro V5 supports 1,400+ ECU firmwares across Bosch (EDC15, EDC16, EDC17, MD1, MG1, ME7, MED17), Siemens / Continental (SID, SIMOS, EMS), Delphi (DCM, DDC), and Magneti Marelli platforms.