The P0849: Transmission Fluid Pressure Sensor/Switch ‘B’ Circuit Intermittent refers to an issue where the circuit connected to the transmission fluid pressure sensor/switch ‘B’ is experiencing intermittent faults. This can be caused by wiring or connector problems, intermittent sensor issues, or a malfunction in the transmission control module (TCM). Consistent and accurate pressure readings are crucial for proper transmission performance.
P0849 – Quick Overview
| Code | Information |
|---|---|
| Meaning | P0849: Transmission Fluid Pressure Sensor/Switch ‘B’ Circuit Intermittent |
| Is it serious? | Yes, intermittent faults can cause unpredictable transmission performance or shifting problems. |
| Possible causes | – Intermittent issues with the transmission fluid pressure sensor/switch ‘B’ – Wiring or connector issues – Faulty transmission control module (TCM) |
| How to diagnose? | – Test for intermittent faults in the circuit – Inspect wiring and connectors – Replace faulty components if needed |
P0849 Meaning
The P0849: Transmission Fluid Pressure Sensor/Switch ‘B’ Circuit Intermittent code indicates that the transmission fluid pressure sensor/switch ‘B’ is experiencing irregular or intermittent issues with its signal. This can lead to shifting problems or erratic transmission operation, which may affect drivability.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check for any additional codes related to the transmission or fluid pressure system. | OBD-II Scanner |
| Inspect Transmission Fluid Pressure Sensor | Visually inspect the transmission fluid pressure sensor/switch ‘B’ for signs of wear, damage, or corrosion. | Flashlight, Safety Gloves |
| Test for Intermittent Faults | Use diagnostic tools to test for intermittent signal issues in the transmission fluid pressure sensor/switch ‘B’ circuit. | Multimeter, Diagnostic Tool |
| Check Wiring and Connectors | Inspect the wiring and connectors for signs of loose connections, damage, or corrosion that could result in intermittent faults. | Flashlight, Multimeter |
| Replace Faulty Components | If the sensor or wiring is found to be faulty, replace the necessary components to restore consistent signal integrity. | 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 P0849 code does not return. | OBD-II Scanner |
OBD-II scanner Buyer’s Guide
- Scanner features explained
- Different types of scanners
- Scanners for coding/odometer/ECU/checks
- Best picks + discount codes
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