Transmission Fluid Pressure Sensor/Switch Circuit Malfunction
The P0875 code indicates a problem in the electrical circuit of the transmission fluid pressure sensor or switch. This sensor monitors hydraulic pressure inside the transmission and sends a signal to the powertrain control module (PCM). When the PCM detects a voltage or resistance value outside the expected range, it sets this code. Common causes include a faulty sensor, damaged wiring, poor electrical connections, or low transmission fluid level. This issue can lead to improper transmission operation, harsh shifting, or limp mode.
01. Most Common Causes
- Faulty transmission fluid pressure sensor
- Damaged or corroded wiring/connectors
- Low or contaminated transmission fluid
- Internal transmission mechanical failure
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Harsh or erratic shifting
- Transmission slipping or stuck in gear
- Reduced fuel economy
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Inspect transmission fluid level and condition; top off or replace if necessary.
Step 3: Visually check wiring and connectors for damage, corrosion, or loose connections.
Step 4: Test the pressure sensor using a multimeter per manufacturer specifications.
Step 5: If sensor and wiring are OK, perform a transmission pressure test to rule out internal issues.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can cause transmission damage. You may experience harsh shifting or limp mode, which limits speed and drivability.
How much does it cost to fix?▼
Repair costs vary from $150 to $400, including parts and labor. A sensor replacement typically costs $100-$250, while wiring repairs may be less. Diagnostic fees are extra.