P0317: Rough Road Hardware Not Present
The P0317 code indicates that the Powertrain Control Module (PCM) has detected a missing or malfunctioning rough road sensor. This sensor is used to detect vibrations from rough roads and adjust ignition timing to prevent misfire detection. Without it, the PCM may incorrectly flag misfire codes or fail to compensate for road conditions.
01. Most Common Causes
- Faulty rough road sensor
- Wiring or connector issues in the sensor circuit
- Blown fuse related to the sensor
- PCM software or hardware failure (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Possible false misfire codes (e.g., P0300)
- Rough idle or hesitation on rough roads
- Reduced fuel economy
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm P0317 and check for other codes.
Step 2: Visually inspect the rough road sensor and its wiring for damage or corrosion.
Step 3: Test the sensor's resistance and voltage with a multimeter per manufacturer specs.
Step 4: Check the sensor's ground and power supply; repair any open or short circuits.
Step 5: If wiring is intact, replace the rough road sensor.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
Yes, but the PCM may not compensate for rough roads, potentially causing false misfire codes and reduced performance. It's best to diagnose and repair promptly.
How much does it cost to fix?▼
Typically $50-$150 for parts and labor, depending on sensor location and vehicle make.