OBD-II code · Network
U0650 Lost Communication With Exhaust Pressure Control Valve A Sensor/Switch
The vehicle bus reports loss of communication with smart exhaust pressure control valve A position sensor/switch (typically used for exhaust brake or DPF regeneration). Closed-loop control loses its feedback.
Is it safe to drive with U0650?
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 Pressure Valve A Sensor, Vehicle Bus Wiring
Related codes
- U067ELost Communication With Exhaust Pressure Control Valve B Sensor/Switch
- U064DLost Communication With Trailer Brake Control Switch
- U064ELost Communication With EGR Cooler Bypass Position Sensor Bank 1
- U064FLost Communication With Intake Manifold Runner Position Sensor Bank 1
- U0651Lost Communication With EGR Sensor A
- U0652Lost Communication With EGR Sensor B
- U0653Lost Communication With EGR Sensor C
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.