OBD-II code · Network
U0654 Lost Communication With Diesel Intake Air Flow A Position Sensor
The vehicle bus reports loss of communication with smart diesel intake air flow control valve A position sensor (intake throttle / swirl flap). Closed-loop control loses its feedback.
Is it safe to drive with U0654?
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
- Diesel Intake Airflow Position Sensor A, Vehicle Bus Wiring
Related codes
- U0655Lost Communication With Diesel Intake Air Flow B Position Sensor
- U0651Lost Communication With EGR Sensor A
- U0652Lost Communication With EGR Sensor B
- U0653Lost Communication With EGR Sensor C
- U0656Lost Communication With Turbocharger/Supercharger Boost Control A Position Sensor
- U0657Lost Communication With Turbocharger/Supercharger Bypass Valve A Position Sensor
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.