P0879
PowertrainTransmission Pressuremoderate severityTransmission Fluid Pressure Sensor/Switch D Circuit
What P0879 Means
A fault has been detected in the transmission fluid pressure sensor or switch D circuit. This can compromise shift quality and pressure regulation.
Symptoms
- Transmission warning light
- Poor shift quality
- Pressure sensor codes stored
Common Causes
- Defective pressure sensor/switch
- Damaged wiring or connector
- Corroded ground
- Faulty control module
Diagnostic Steps
- Scan for related codes
- Inspect circuit wiring and connectors
- Measure sensor signal voltage
- Test control module inputs
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