The P0847: Transmission Fluid Pressure Sensor/Switch ‘B’ Circuit Low refers to a condition where the circuit connected to the transmission fluid pressure sensor or switch ‘B’ is detecting a lower-than-expected voltage. This issue can be caused by a faulty sensor, wiring problems, or a malfunction in the transmission control module (TCM). The transmission fluid pressure must be correctly measured for smooth shifting and proper transmission operation.
P0847 – Quick Overview
| Code | Information |
|---|---|
| Meaning | P0847: Transmission Fluid Pressure Sensor/Switch ‘B’ Circuit Low |
| Is it serious? | Yes, this can result in transmission performance issues, including improper shifting. |
| Possible causes | – Low voltage in the transmission fluid pressure sensor/switch ‘B’ 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 |
P0847 Meaning
The P0847: Transmission Fluid Pressure Sensor/Switch ‘B’ Circuit Low code indicates that the voltage detected in the circuit for the transmission fluid pressure sensor/switch ‘B’ is below the expected range. This low voltage may cause improper transmission fluid pressure readings, which can lead to shifting problems or incorrect transmission behavior.
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 further insights. | OBD-II Scanner |
| Inspect Transmission Fluid Pressure Sensor | Visually inspect the transmission fluid pressure sensor/switch ‘B’ for damage, wear, or loose connections. | Flashlight, Safety Gloves |
| Test the Circuit for Low Voltage | Use a multimeter to measure the voltage in the transmission fluid pressure sensor/switch ‘B’ circuit and verify if it’s below specifications. | Multimeter |
| Check Wiring and Connectors | Inspect the wiring and connectors for signs of damage, corrosion, or loose connections that could affect voltage levels. | Flashlight, Multimeter |
| Replace Faulty Components | If the sensor, wiring, or connectors are found to be faulty, replace the components to restore proper circuit function. | Replacement Parts, Basic Tools |
| Clear the Code and Test Drive | After repairs, clear the code using an OBD-II scanner and take the vehicle for a test drive 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 P0847 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