The P0871 OBD-II code indicates a problem with the Transmission Fluid Pressure Sensor, specifically the “C” circuit. This code is triggered when the Transmission Control Module (TCM) detects an incorrect signal from the Transmission Fluid Pressure Sensor.
What Does the P0871 Code Mean?
When the TCM receives an erroneous signal about the transmission fluid’s pressure, it sets the P0871 code. This is crucial as the sensor plays a vital role in ensuring the transmission operates smoothly and efficiently.
What Causes the P0871 Code?
Several factors can contribute to the P0871 code being thrown, including:
- Transmission Control Module (TCM) failure
- Transmission fluid pressure sensor failure
- Wiring issues such as damaged or corroded connectors
What Are the Symptoms of the P0871 Code?
Drivers may experience various symptoms when the P0871 code is present, including:
- Transmission may not shift properly
- Increased fuel consumption
How Serious Is the P0871 Code?
The P0871 code is classified as urgent, indicating that immediate action is necessary. Ignoring this code can lead to severe damage to the vehicle’s transmission and may pose safety risks for the driver and passengers.
How to Diagnose the P0871 Code
To accurately diagnose the P0871 code, a mechanic should follow these steps:
- Use an OBD-II scanner to confirm the P0871 code and check for additional codes.
- Inspect the wiring and connectors related to the Transmission Fluid Pressure Sensor for any visible damage.
- Test the Transmission Fluid Pressure Sensor with a multimeter to ensure it operates within the manufacturer’s specifications.
- Check the Transmission Control Module (TCM) for faults or failures.
Common Repairs for the P0871 Code
Common repairs to address the P0871 code may include:
- Replacing the Transmission Fluid Pressure Sensor
- Repairing or replacing damaged wiring or connectors
- Replacing or reprogramming the Transmission Control Module (TCM)
How Much Does It Cost to Fix the P0871 Code?
The cost to fix the P0871 code can vary widely depending on the specific issue and labor costs in your area. Generally, repairs can range from $100 to $1,000, depending on whether a simple sensor replacement or a more complex module replacement is required.
Can I Fix the P0871 Code Myself?
While some DIY enthusiasts may tackle the replacement of the Transmission Fluid Pressure Sensor or basic wiring repairs, it is crucial to have a thorough understanding of the transmission system and proper diagnostic tools. For most drivers, consulting a professional mechanic is recommended to ensure accurate diagnosis and repair.
