U068B code meaning
Lost Communication With Turbocharger/Supercharger Inlet Pressure Sensor A
Network system Generic code U06xx codes Check engine light
What U068B means
The inlet pressure sensor sits between air filter and compressor. Its reading shows filter restriction and, together with boost pressure, the pressure ratio the compressor works against. Ford's 2023 diesel summary connects sensor A via SENT and lists U068B in its SENT sensor group: U068B follows when the low-level SENT driver sees the signal line pinned to one voltage level, either up or down, monitored without pause and judged over 5 s. A sensor that still talks but raises its own error flag or reports data above a threshold sets P012A instead. Combined pressure and temperature chips such as Infineon's KP276 deliver this kind of SENT signal. U068C is the code for a second inlet sensor. Without the value the controller estimates inlet pressure, and boost or filter monitoring become less precise.
U068B at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyEasy, DIY possible
- Typical labor0.3 to 1.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U068B
- Check engine light
- Air filter restriction no longer monitored
- Possibly somewhat reduced boost
Common causes of U068B
- Most likelySENT signal wire shorted to ground or voltage, or open
- PossibleConnector on the intake duct loose, oily or corroded
- PossibleInlet pressure sensor failed
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Turbo inlet pressure sensor aVehicle bus wiring
What each part of U068B means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 8B | The exact fault in that area. |
What to do next
- Note U068B 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 U068B
What does U068B mean?
U068B means "Lost Communication With Turbocharger/Supercharger Inlet Pressure Sensor A". The inlet pressure sensor sits between air filter and compressor. It is a generic code, so it means the same on every make.
Is it safe to drive with U068B?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will U068B fail an emissions test?
Yes, it can. U068B 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 U068B to fix?
Difficulty: easy. 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 U068B clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.