P0870

Transmission Fluid Pressure Sensor/Switch C Circuit

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$17–56 (est.)

Symptoms

Incorrect gear shifting
Hard gear shifts
Transmission transition to emergency mode
Increased fuel consumption
Check Engine Light Is On

Causes

Open or short circuit in the sensor circuit
Faulty transmission fluid pressure sensor
Poor connection in connectors
Faulty Transmission Control Module (TCM)
Contaminated or low transmission fluid level

How to Fix

Check the level and condition of the transmission fluid
Visually inspect the sensor wiring harness and connectors
Check the resistance of the fluid pressure sensor
Check sensor signals using an oscilloscope or multimeter
Replace transmission fluid pressure sensor if necessary

Related codes

P0868 P0869 P0871