U067ALost Communication With Transmission Fluid Pressure Sensor/Switch B
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- Sensor B is the second pressure measuring point. In GM's CVT table 25OBDG03A it reads the secondary pulley, whose pressure sets the clamping force on the belt; its plausibility check runs only above 1,200 rpm with line pressure over 1,000 kPa and a secondary command above 500 kPa. In GM's 24OBDG07 B belongs to clutch 2, fed from its own reference VREF2, and Ford's 2024 summary checks TFP B with P0846 to P0848. U067A stands for a digital sensor B whose messages have stopped. No manufacturer documents this code publicly. With the clamping or clutch pressure unknown, the controller has to work with assumed values, which can mean firmer shifts, limited torque or a fixed gear. If A is still readable, the fault sits in B's own branch.
- What you may notice
- Firm shifts or engagement
- Reduced engine torque, limp mode
- Warning light on
- Likely causes
- LikelyInternal wiring to sensor B damaged
- PossiblePressure sensor B failed
- PossibleSeparate sensor supply for B faulty
- RareTransmission controller fault
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.