Pressure Control Solenoid B Control Circuit / Open
The engine control unit detected a break or poor connection in the electrical circuit controlling the pressure solenoid for transmission fluid. Think of it like a light switch that's either loose or broken—the power can't reach the solenoid to function properly.
The ECM monitors voltage and current draw through the pressure control solenoid B circuit. It detects opens (broken connections) or shorts by checking if expected voltage appears at the solenoid coil during commanded cycles. When resistance exceeds normal thresholds or voltage fails to reach the solenoid, the fault is triggered.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Solenoid Circuit Voltage | 11.5-14.5V when commanded active | 0V or missing signal / open circuit detected |
| Solenoid Coil Resistance | 5-15 ohms (varies by solenoid) | Infinite resistance (open) or critically high |
Code P0964 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, P0964 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.