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DTC codes / U06xx · Network communication / U067A

U067ALost Communication With Transmission Fluid Pressure Sensor/Switch B

U067A is a generic network communication code indicating that a control module has lost contact with the transmission fluid pressure sensor or switch B circuit. The computer detected that the expected data signal from this sensor is missing or invalid, which can affect transmission shift quality and pressure control.

SystemNetwork
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaNetwork communication

Symptoms you may notice

  • Illumination of the check engine light or transmission warning light
  • Harsh or delayed transmission shifts
  • Transmission stuck in limp mode or a single gear
  • Erratic or inconsistent shift points
  • Often no symptoms besides the warning light, especially if the fault is intermittent

Common causes, most likely first

  1. Faulty transmission fluid pressure sensor or switch B
  2. Damaged or corroded wiring or connector at the sensor
  3. Open or short circuit in the sensor signal or ground circuit
  4. Failed transmission control module or internal fault
  5. Low transmission fluid level or contaminated fluid affecting sensor readings
  6. Software glitch or communication bus issue requiring module reset

How to diagnose and fix it

  1. Verify battery voltage and inspect the sensor connector for corrosion or damage
  2. Check transmission fluid level and condition according to the manufacturer's procedure
  3. Perform a visual inspection of the wiring harness from the sensor to the control module
  4. Use a scan tool to monitor live transmission pressure sensor data and compare with specifications
  5. Test the sensor circuit with a multimeter for continuity, shorts, and reference voltage
  6. Replace the transmission fluid pressure sensor or switch B if testing indicates failure
  7. Clear the code and perform a relearn or adaptation drive cycle to confirm the repair

What the pressure sensor code hides

  • A loose or corroded connector at the transmission case is a frequent culprit that mimics a failed sensor and costs far less to fix.
  • Low fluid level from a slow leak can cause the pressure sensor to report out-of-range values, setting U067A without any sensor defect.
  • The code can be stored intermittently by a momentary voltage drop during cranking, so always check for a weak battery before condemning parts.
  • On some vehicles, the transmission control module shares a communication bus with other modules, so a fault elsewhere on the bus can trigger this code.
  • Replacing the sensor without checking the wiring harness often leads to a repeat failure because the original cause was a chafed wire.

Can I keep driving with U067A?

You can usually drive the vehicle to a repair shop, but avoid heavy acceleration or towing because the transmission may shift harshly or enter limp mode. If the transmission slips severely or refuses to engage gears, stop driving and have it towed to prevent internal damage.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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