Pressure Control Solenoid B Electrical
The transmission control computer detected an electrical problem with the pressure control solenoid B, which is like a valve that's supposed to open and close to regulate fluid pressure but isn't responding properly. This could be a wiring issue, a bad solenoid, or a problem with the transmission control module itself.
The ECM monitors the electrical current and voltage supplied to pressure control solenoid B during activation. It compares the actual solenoid response against expected resistance and current draw values. If the signal is open, shorted, or shows abnormal impedance, a fault is triggered.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Solenoid Coil Resistance | 4-14 ohms (varies by vehicle) | Out of range or no continuity detected |
| Circuit Voltage | 11-14 volts during activation | Below 10V or above 15V / open circuit |
Code P0782 is a moderate fault. You can generally drive to a workshop, but avoid long trips or high-load driving (motorway, uphill towing) until it is diagnosed. If the code keeps returning after clearing, or if you notice the symptoms listed above worsening, do not delay professional diagnosis. Many moderate codes have multiple possible root causes — a mechanic with live OBD data can identify the exact fault more efficiently than part-by-part trial and error.
Once the fault is repaired, P0782 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.