The P0779: Pressure Control Solenoid B Intermittent fault refers to an issue where pressure control solenoid “B” is functioning intermittently, causing inconsistent transmission fluid pressure regulation. This can lead to erratic gear shifts or transmission performance issues. The problem may be caused by a faulty solenoid, wiring problems, or loose electrical connections.
P0779 – Quick Overview
| Code | Information |
|---|---|
| Meaning | P0779: Pressure Control Solenoid B Intermittent |
| Is it serious? | Yes, intermittent solenoid performance can cause erratic shifting and potential transmission damage. |
| Possible causes | – Intermittent issues with pressure control solenoid B – Faulty solenoid – Wiring or connection issues |
| How to diagnose? | – Test solenoid B for intermittent faults – Inspect wiring and connectors – Replace faulty solenoid if necessary |
P0779 Meaning
The P0779 code indicates that pressure control solenoid “B” is experiencing intermittent functionality. This solenoid is responsible for regulating transmission fluid pressure to ensure smooth shifting. Intermittent solenoid operation can cause poor shifting, gear slippage, or delayed engagement, affecting overall vehicle performance.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check for any additional transmission-related codes that may provide further insight into the issue. | OBD-II Scanner |
| Test Solenoid B for Intermittent Faults | Use a multimeter or diagnostic scanner to test solenoid B for electrical continuity and function under varying conditions to detect intermittent performance. | Multimeter, Diagnostic Scanner |
| Inspect Wiring and Connectors | Inspect the wiring and connectors leading to solenoid B for damage, loose connections, or corrosion that could cause intermittent issues. Repair or replace as necessary. | Flashlight, Multimeter, Safety Gloves |
| Check Transmission Fluid | Ensure the transmission fluid level is correct and the fluid is clean, as low or dirty fluid can affect solenoid performance. Adjust fluid level if necessary. | Transmission Fluid Tester, Dipstick |
| Replace Faulty Solenoid | If solenoid B is found to be malfunctioning intermittently, replace it with a new one according to manufacturer specifications. | Replacement Parts, Wrenches, Screwdrivers |
| Clear the Code and Test Drive | After replacing the solenoid, clear the code using an OBD-II scanner and test drive the vehicle to ensure the issue is resolved. | OBD-II Scanner |
| Recheck for Codes | After the test drive, rescan the vehicle to ensure the P0779 code has not returned. | OBD-II Scanner |
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