OBD-II code · Network
U065E Lost Communication With Ram Air Actuator
The vehicle bus reports loss of communication with smart HVAC ram-air actuator (high-speed fresh-air bypass flap). Bypass control cannot be commanded; airflow at speed may differ from setpoint.
Is it safe to drive with U065E?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyBus wiring open or shorted
- PossibleModule without power or ground
- PossibleModule failed
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–2 h
- Emissions test
- Usually unaffected
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Ram Air Actuator, Vehicle Bus Wiring
Related codes
- U065BLost Communication With Left Front Mode Actuator
- U065CLost Communication With Right Front Mode Actuator
- U065DLost Communication With Air Intake Actuator
- U065FLost Communication With Left Rear Temperature Actuator A
- U0660Lost Communication With Left Rear Temperature Actuator B
- U0661Lost Communication With Right Rear Temperature Actuator A
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.