The P0871: Transmission Fluid Pressure Sensor/Switch ‘C’ Circuit Range/Performance fault code indicates that the transmission fluid pressure sensor or switch ‘C’ is operating outside of its expected range or has performance-related issues. This can lead to improper shifting and overall transmission performance problems. The issue could be due to a faulty sensor, wiring problems, or other related issues affecting the sensor’s ability to function properly.
P0871 – Quick Overview
| Code | Information |
|---|---|
| Meaning | P0871: Transmission Fluid Pressure Sensor/Switch ‘C’ Circuit Range/Performance |
| Is it serious? | Yes, this can lead to transmission shifting issues or erratic transmission behavior. |
| Possible causes | – Transmission fluid pressure sensor/switch ‘C’ out of range – Performance issues with the sensor/switch – Wiring or connector issues |
| How to diagnose? | – Test the sensor/switch for range and performance – Inspect wiring and connectors – Replace faulty components if needed |
P0871 Meaning
The P0871: Transmission Fluid Pressure Sensor/Switch ‘C’ Circuit Range/Performance code indicates that the transmission fluid pressure sensor or switch ‘C’ is reporting readings outside of the expected range or is not performing properly. This sensor is crucial for ensuring the transmission fluid pressure is properly regulated, and its failure can cause shifting problems or damage to the transmission.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check for additional transmission-related codes that may provide more insight into the issue. | OBD-II Scanner |
| Test Transmission Fluid Pressure Sensor/Switch ‘C’ | Use a multimeter to test the sensor/switch ‘C’ and ensure it is operating within the correct range as specified by the manufacturer. | Multimeter |
| Inspect Wiring and Connectors | Visually inspect the wiring and connectors leading to the sensor for signs of damage, wear, corrosion, or loose connections. | Flashlight, Multimeter |
| Check the Transmission Control Module (TCM) | Use a diagnostic tool to ensure that the TCM is functioning correctly and communicating properly with the sensor/switch ‘C’. | Diagnostic Tool |
| Replace Faulty Components | If the sensor, wiring, or connectors are faulty, replace the necessary components to restore proper sensor operation. | Replacement Parts, Basic Tools |
| Clear the Code and Test Drive | After making repairs, clear the code using an OBD-II scanner and take the vehicle for a test drive to ensure normal transmission function. | OBD-II Scanner, Vehicle Owner’s Manual |
| Recheck for Codes | After the test drive, re-scan the system to confirm that the P0871 code does not return. | OBD-II Scanner |
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I test OBD-II scanners and make DIY Engine diagnostics guides to help you solve your car problems without having to depend on the mechanic. A lot of them will try to scam you or are just no help at all. About Juraj Lukacko