Gear Shift Position Circuit Range/Performance
Your transmission can't properly sense which gear it's in, like a light switch that doesn't know if it's on or off. The ECU is receiving inconsistent or out-of-range signals from the gear position sensor.
The ECU monitors the gear shift position sensor voltage to confirm actual gear selection matches driver input. The sensor produces a specific voltage range for each gear position (Park, Reverse, Neutral, Drive, etc.). If voltage falls outside expected thresholds or fluctuates unexpectedly, the ECU logs a fault.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Gear Position Sensor Voltage | 0.5V-4.5V (varies by gear) | Below 0.2V or above 4.9V, or rapid voltage oscillation |
| Sensor Signal Consistency | Stable voltage per gear selection | Signal jumps between multiple voltage states without user input |
Code P0915 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, P0915 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.