U0675 code meaning
Lost Communication With Turbocharger/Supercharger Speed Sensor A
Network system Generic code U06xx codes Check engine light
What U0675 means
A speed sensor in the bearing or compressor housing lets the controller watch how fast the turbocharger rotor spins, mainly to keep it below its overspeed limit; a BorgWarner patent (US9353760B2) describes such a sensor and gives that reason, and CARB names turbocharger/turbine speed among the data diesel vehicles must output. Classic sensors send a pulse train whose faults are P2578 to P2582. U0675 applies when sensor A delivers the speed as a digital message and those messages are missing or invalid. No manufacturer documents this code publicly. Without a speed value the controller cannot tell how close the rotor is to its limit, so it will usually cap boost and engine power until the fault is gone.
U0675 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U0675
- Check engine light
- Boost and power limited
- Noticeably weaker acceleration at higher loads
Common causes of U0675
- Most likelySensor wiring near the turbocharger heat-damaged or broken
- PossibleConnector loose, oily or corroded
- PossibleSpeed sensor electronics failed
- Less likelyEngine controller input or software fault
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Turbo speed sensor aVehicle bus wiring
What each part of U0675 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 75 | The exact fault in that area. |
What to do next
- Note U0675 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 U0675
What does U0675 mean?
U0675 means "Lost Communication With Turbocharger/Supercharger Speed Sensor A". A speed sensor in the bearing or compressor housing lets the controller watch how fast the turbocharger rotor spins, mainly to keep it below its overspeed limit; a BorgWarner patent (US9353760B2) describes such a sensor and gives that reason, and CARB names turbocharger/turbine speed among the data diesel vehicles must output. It is a generic code, so it means the same on every make.
Is it safe to drive with U0675?
Drive gently and only to a workshop. With U0675 the car can go into limp mode (reduced power) to protect itself.
Will U0675 fail an emissions test?
Yes, it can. U0675 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 U0675 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2.5 hours of work. This is a job for a workshop.
Will U0675 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.