U0679

Lost Communication With Transmission Fluid Pressure Sensor/Switch A

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$17–89 (est.)

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