The P0877: Transmission Fluid Pressure Sensor/Switch ‘D’ Circuit Low fault code indicates that the transmission fluid pressure sensor or switch ‘D’ is detecting lower-than-expected voltage. This can cause improper transmission fluid pressure monitoring, which may lead to transmission shifting issues. The issue may be caused by faulty wiring, a malfunctioning sensor, or problems with the transmission control module (TCM).
P0877 – Quick Overview
| Code | Information |
|---|---|
| Meaning | P0877: Transmission Fluid Pressure Sensor/Switch ‘D’ Circuit Low |
| Is it serious? | Yes, it can cause improper transmission shifting and performance problems. |
| Possible causes | – Low voltage in the transmission fluid pressure sensor/switch ‘D’ circuit – Faulty sensor or wiring – Faulty transmission control module (TCM) |
| How to diagnose? | – Test the circuit for low voltage – Inspect wiring and connectors – Replace faulty components if needed |
P0877 Meaning
The P0877: Transmission Fluid Pressure Sensor/Switch ‘D’ Circuit Low code indicates that the voltage in the transmission fluid pressure sensor or switch ‘D’ circuit is below the expected range. This low voltage can cause the sensor to improperly monitor transmission fluid pressure, leading to shifting issues and transmission performance problems.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check for any additional related codes that may provide more information about the issue. | OBD-II Scanner |
| Test the Circuit for Low Voltage | Use a multimeter to test the voltage in the transmission fluid pressure sensor/switch ‘D’ circuit and compare it to manufacturer specifications. | Multimeter |
| Inspect Wiring and Connectors | Visually inspect the wiring and connectors leading to the sensor/switch for signs of damage, wear, corrosion, or loose connections. Repair or replace as needed. | Flashlight, Multimeter |
| Test Transmission Control Module (TCM) | Use a diagnostic tool to ensure the TCM is functioning correctly and communicating properly with the sensor. | Diagnostic Tool |
| Replace Faulty Components | If the sensor, wiring, or TCM is found faulty, replace the necessary components to restore normal transmission operation. | Replacement Parts, Basic Tools |
| Clear the Code and Test Drive | After completing repairs, clear the code using an OBD-II scanner and test drive the vehicle to ensure proper transmission function. | OBD-II Scanner, Vehicle Owner’s Manual |
| Recheck for Codes | After the test drive, re-scan the system to confirm that the P0877 code does not return. | OBD-II Scanner |
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Hi, I am Juraj “Yuri” Lukacko. I got frustrated by unhelpful and scammy mechanics, so I decided to learn everything about car diagnostics myself. I test dozens of new car diagnostic tools every month along with learning new strategies to fix and customize cars. About Juraj Lukacko (Yuri)