P0870
PowertrainTransmission Pressuremoderate severityTransmission Fluid Pressure Sensor/Switch C Circuit
What P0870 Means
A fault has been detected in the transmission fluid pressure sensor or switch C circuit. This affects the accuracy of pressure readings used for shift control.
Symptoms
- Transmission warning light
- Erratic shifting
- Stored pressure sensor codes
Common Causes
- Faulty pressure sensor/switch
- Wiring or connector fault
- Poor ground connection
- Failed TCM
Diagnostic Steps
- Retrieve stored trouble codes
- Inspect sensor wiring and connectors
- Test sensor signal and resistance
- Verify TCM inputs
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