Gear Shift Lock Solenoid Circuit / Open
The gear shift lock solenoid circuit has an electrical break, like a disconnected wire preventing a door lock from engaging. Your vehicle can't properly lock the shifter in park or prevent unwanted gear changes.
The ECM monitors voltage and current flow through the gear shift lock solenoid circuit during key-on and shifting events. It expects a specific voltage drop when the solenoid engages. An open circuit causes zero or abnormal resistance, triggering the fault.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Solenoid Circuit Voltage | 12V during engagement, proper current draw | 0V or no current flow detected |
| Circuit Resistance | 4-8 ohms when energized | Open circuit (infinite resistance) |
Code P0928 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, P0928 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.