P0317
UniversalThe Powertrain Control Module (PCM) has detected that the rough road hardware/sensor, which is used to enhance misfire detection accuracy, is not present or not reporting data.
Low SeverityThis code indicates that the vehicle's computer (PCM) is not receiving data from the rough road hardware, which is designed to help the engine detect misfires more accurately during bumpy conditions. This usually means the sensor was either never installed on the vehicle or has failed.
⚠️ Before You Begin (Safety First)
Always ensure the vehicle is safely supported on a level surface before performing any inspection. Disconnect the battery before working on electrical components to prevent short circuits or electrical shock.
Common Symptoms
- Check Engine Light (MIL) illuminated
- Potentially inaccurate misfire detection (P030x codes might be less reliable)
- No direct drivability symptoms typically associated with this code alone
Common Causes
- Vehicle not originally equipped with rough road hardware (most common cause for "not present")
- Faulty or disconnected rough road sensor (if the vehicle was originally equipped)
- Wiring harness issue to the rough road sensor
- Aftermarket ECU or tune not configured for existing rough road hardware
- Faulty Powertrain Control Module (PCM) (rare)
Frequently reported on: General/Universal (often aftermarket or base models)
Diagnostic Steps
- Confirm Vehicle Equipment: Research your specific vehicle's make, model, and year to determine if it was factory-equipped with a rough road sensor. Many vehicles, especially older ones or those without advanced stability control systems, may not have this hardware.
- Inspect Sensor and Wiring (if applicable): If your vehicle should have the sensor, locate it (often near the suspension or under the dash) and visually inspect its electrical connector for proper connection and any signs of damage, corrosion, or loose wires.
- Clear Code: After inspection, clear the P0317 code using an OBD-II scanner. Drive the vehicle to see if the code returns.
- Consider Aftermarket Configuration: If you have an aftermarket ECU or engine tune, verify if it is correctly configured for the presence or absence of rough road hardware.
👨🔧 When to Call a Professional
If you experience any engine misfires, rough idling, or other performance issues in conjunction with this code, consult a professional mechanic as the absence of this hardware could be impacting misfire detection.
Commonly Asked Questions
What is "rough road hardware" and why is it important?
Rough road hardware, often an accelerometer, helps the engine's computer distinguish between engine misfires and vibrations caused by driving over rough terrain. This prevents false misfire detections and improves the accuracy of misfire monitoring.
Will this code affect my vehicle's performance?
P0317 typically does not directly affect vehicle performance or drivability. Its primary impact is on the accuracy of the misfire detection system, meaning other misfire codes (P030x) might be less reliable when this sensor is not reporting.
Can I drive with a P0317 code?
Yes, generally it is safe to drive with a P0317 code as it doesn't indicate a critical engine or transmission malfunction. However, you should still investigate the cause to ensure other potential issues are not masked.
How do I know if my car should have this sensor?
You can check your vehicle's owner's manual, a service manual, or an online parts catalog for your specific make, model, and year. Vehicle trims without advanced stability control or specific engine monitoring might not have it.
Is it possible this code is set by an aftermarket ECU or tune?
Yes, if an aftermarket ECU or engine tune is installed, it might not be properly configured to acknowledge the presence or absence of the rough road sensor, leading to this code.