Fuel Select Switch Malfunction
Your vehicle has a switch that selects between different fuel types (like regular vs. ethanol blends), and it's not working properly. Think of it like a broken light switch that can't reliably toggle between two positions.
The ECU monitors the fuel select switch signal to determine which fuel type is being used and adjust engine parameters accordingly. It expects a clean digital signal that toggles between two states (low/high voltage) corresponding to fuel type selection. If the signal is erratic, stuck, or absent, the ECU logs this fault.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Fuel Select Switch Signal | Clean 0V or 5V digital transition | Stuck signal, noise, or missing transitions |
| Signal Continuity | Continuous without dropouts | Intermittent or open circuit detected |
Code P1168 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, P1168 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.