What it means
The vehicle bus reports loss of communication with smart boost pressure sensor A. The boost-control loop loses its actual feedback and reverts to an open-loop fallback that limits boost.
At a glance
- Usually lights the warning light of the system that lost communication
- Affects emissions; the car can fail an emissions test
- The engine or gearbox may go into limp mode
How it works
Smart boost pressure sensor A reports pressure feedback to the turbocharger or supercharger control system over the vehicle network. U060B sets when that feedback message is lost, so boost control may use an open-loop fallback that limits boost.
Common causes
Most likely first.
- Bus wiring open or shorted
- Module without power or ground
- Module 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
How to diagnose it
- Record freeze-frame data and scan all modules for communication codes to see when boost sensor A stopped reporting and whether related network faults occurred.
- Check live boost pressure data for sensor A and compare it with other available pressure readings under the recorded operating conditions.
- Inspect sensor A's connector and bus wiring for loose terminals, corrosion, heat damage, or shorts.
- Verify sensor A's power and ground circuits against the manufacturer's specification.
- Test the network wiring serving sensor A for opens or shorts, then evaluate the sensor module if its wiring and supplies are sound.
Common fixes
- Reconnect or clean boost sensor A's connector.
- Repair damaged or shorted bus wiring to sensor A.
- Restore the sensor module's power or ground connection.
- Replace boost sensor A's module if its network path and supplies are verified but it still does not communicate.
Can I keep driving?
The vehicle may have limited power or enter limp mode, so avoid fast roads, towing, and hard acceleration. Drive only a short distance if it can keep up safely; stop if power loss makes traffic unsafe.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.