U0679
Lost Communication With Transmission Fluid Pressure Sensor/Switch A
U0679 is an OBD-II diagnostic trouble code meaning: Lost Communication With Transmission Fluid Pressure Sensor/Switch A. Common causes: open or short circuit in the sensor circuit, transmission fluid pressure sensor malfunction. Estimated repair cost: $17–89.
Symptoms
- Incorrect gear shifting
- Delays when shifting gears
- Check Engine Light Illuminates
- Transmission transition to emergency mode
- Reduced vehicle dynamics
Causes
- Open or short circuit in the sensor circuit
- Transmission fluid pressure sensor malfunction
- Problems with connectors or wiring
- Transmission control module (TCM) malfunction
- Low transmission fluid level
How to Fix
- Check the level and condition of the transmission fluid
- Inspect the sensor circuit for damage
- Check the connectors and connection of the sensor
- Test pressure sensor resistance
- Carry out diagnostics of the transmission control unit
Related codes
Error U0679 by Vehicle Brand
FAQ
What does the U0679 code mean?
U0679 is an OBD-II diagnostic trouble code that indicates: Lost Communication With Transmission Fluid Pressure Sensor/Switch A
What causes a U0679 error code?
The most common causes of U0679 include: Open or short circuit in the sensor circuit; Transmission fluid pressure sensor malfunction; Problems with connectors or wiring; Transmission control module (TCM) malfunction.
How do I fix a U0679 diagnostic trouble code?
To fix U0679: Check the level and condition of the transmission fluid. Inspect the sensor circuit for damage. Check the connectors and connection of the sensor. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U0679?
Limited driving only, diagnose soon
How much does it cost to fix U0679?
The estimated repair cost for U0679 is $17–89. Actual cost depends on your vehicle, location, and labor rates.
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