Pressure Control Solenoid "A" Short Circuit
The transmission's pressure control solenoid is electrically short-circuited, like a light switch with exposed wires touching. This prevents proper hydraulic pressure regulation in the transmission.
The ECM monitors solenoid resistance and current draw during operation. It detects abnormally low resistance indicating a short circuit condition. The solenoid should show proper voltage response; a short causes excessive current draw.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Solenoid Resistance | 5-15 ohms | Less than 2 ohms or continuity to ground |
| Current Draw | 0.5-2.0 amps | Greater than 3.5 amps |
Code P1768 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, P1768 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.