Rough Road Hardware Not Present
Your vehicle's rough road detection sensor is either missing or not communicating with the engine computer. It's like having a pothole detector that's unplugged, so the system can't warn about bumpy road conditions.
The ECM monitors for the presence of a rough road detection sensor (typically an accelerometer) that detects sudden road surface impacts. The sensor sends signal pulses to the ECM; if no signal is detected during vehicle operation, the ECM sets this code. The threshold is based on expected sensor communication and signal presence during normal driving.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Sensor Signal Presence | Active signal detected during driving cycles | No sensor signal detected or sensor not responding |
| Communication Status | Sensor data present in module output | Sensor data missing from ECM input |
Code P0317 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, P0317 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.