OBD-II code · Network
U063E Lost Communication With Exhaust Heat Exchanger Bypass Valve Actuator A
The vehicle bus reports loss of communication with smart exhaust heat exchanger bypass valve actuator A. Exhaust-heat recovery cannot be commanded; cabin/coolant warm-up may slow down.
Is it safe to drive with U063E?
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
- 0.5–3 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Exhaust Heat Exchanger Bypass Actuator A, Vehicle Bus Wiring
Related codes
- U066CLost Communication With Exhaust Heat Exchanger Bypass Valve Actuator B
- U063BLost Communication With Coolant Bypass Valve Actuator A
- U063CLost Communication With Coolant Bypass Valve Actuator B
- U063DLost Communication With Hybrid/EV Electronics Coolant Pump A
- U063FLost Communication With Engine Coolant Flow Control Valve Position Sensor
- U0640Lost Communication With EVAP Fuel Vapor Temperature Sensor Circuit
- U0641Lost Communication With EVAP System Pressure Sensor/Switch Circuit A
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.