U0601 code meaning
Lost Communication With Particulate Filter Pressure Sensor A
Network system Generic code U06xx codes Check engine light
What U0601 means
Particulate filter pressure sensor A measures the pressure drop across a diesel or gasoline particulate filter, the basis for soot load estimates and filter monitoring. Digital versions report over SENT. GM's 2025 diesel tables (25OBDG04A/B) call it differential pressure sensor loss of communication: it sets when the sensor reports an internal fault that shuts its SENT output, when 158 of 200 checks fail, or when no fresh message has come for over 12.5 s; it is Type A, so the MIL comes on in the first trip. Ford's 2023 diesel summary flags a SENT driver error or a line stuck high or low, and Ford's 2024 gasoline summary uses it for the filter sensors with 5 s to register. U0602, U0696 and U0697 cover sensors B to D.
U0601 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium, DIY possible
- Typical labor0.3 to 1.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U0601
- Check engine light, on GM already in the first trip
- Filter regeneration may run on a model only or be blocked
- Reduced power on some diesels
Common causes of U0601
- Most likelySENT line, 5 V supply or ground interrupted or shorted
- PossibleSensor internal fault switching off its output (heat, moisture)
- PossibleCorroded connector near the exhaust
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
DPF pressure sensor aSensor wiring
What each part of U0601 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 01 | The exact fault in that area. |
What to do next
- Note U0601 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about U0601
What does U0601 mean?
U0601 means "Lost Communication With Particulate Filter Pressure Sensor A". Particulate filter pressure sensor A measures the pressure drop across a diesel or gasoline particulate filter, the basis for soot load estimates and filter monitoring. It is a generic code, so it means the same on every make.
Is it safe to drive with U0601?
Drive gently and only to a workshop. With U0601 the car can go into limp mode (reduced power) to protect itself.
Will U0601 fail an emissions test?
Yes, it can. U0601 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is U0601 to fix?
Difficulty: medium. A typical repair takes 0.3 to 1.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will U0601 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.