What it means
The controller has lost communication with particulate filter pressure sensor A. It can no longer receive that sensor’s pressure data.
How it works
The title assigns U0601 to lost communication with particulate filter pressure sensor A, but U-code definitions may differ between vehicles and scan tools. If this assignment is correct for the vehicle, the controller cannot receive pressure data from sensor A, which may prevent reliable particulate-filter monitoring.
Common causes
Most likely first.
- Manufacturer-specific code assignment
- Vehicle-specific diagnostic interpretation
- Scan tool database mismatch
Symptoms
- No generic symptom pattern
- Vehicle behavior depends on any manufacturer-specific fault
How to diagnose it
- Verify the vehicle-specific definition of U0601 in service information and confirm that the vehicle uses a communicating particulate-filter pressure sensor A.
- Scan all modules and save freeze-frame data and related particulate-filter, regeneration, or network codes.
- Check live sensor data, if available, for a missing or fixed reading and note any filter or emissions warnings.
- Inspect sensor A’s connector, power and ground connections, and network wiring for corrosion, heat damage, breaks, or a disconnected harness.
- Test sensor communication and circuit integrity to the manufacturer’s specification before deciding whether the sensor or a controller has failed.
Common fixes
- Correct a scan-tool database or vehicle-selection mismatch if the code definition does not apply.
- Repair a loose, corroded, or damaged sensor A connector or wire.
- Restore the sensor’s specified power, ground, or network connection.
- Replace particulate-filter pressure sensor A if vehicle-specific testing confirms failure.
- Repair a controller or network fault only when communication tests identify it.
Can I keep driving?
If the vehicle runs normally and no emissions or filter warning is active, limit unnecessary driving and arrange diagnosis soon. Avoid repeated long trips or attempted regenerations when pressure feedback is unavailable, since filter monitoring and regeneration may be affected.
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.