Rough Road Hardware Not Present (P0317)
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 errors. Without it, the PCM may incorrectly flag misfire codes or fail to compensate for road conditions.
1. Most Common Causes
- Rough road sensor not installed or disconnected
- CAN bus communication failure with the ABS/ESC module (which provides the rough road signal)
- Faulty or unprogrammed ABS/ESC module
- Incorrect PCM programming (software incompatible with vehicle hardware)
- Open or short circuit in wiring between PCM and ABS module or dedicated sensor
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Possible false misfire codes (P0300-P0308)
- Rough idle or hesitation on bumpy roads
- No noticeable drivability issues in some cases
3. Step-by-Step Diagnosis
Step 1: Scan for additional codes and freeze frame data.
Step 2: Visually inspect the rough road sensor and its wiring for damage or corrosion.
Step 3: Test sensor resistance and voltage with a multimeter per manufacturer specs.
Step 4: Check for PCM software updates and reflash if necessary.
4. 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. It's best to diagnose and repair soon.
How much does it cost to fix?▼
Typically $50-$150 for sensor replacement, plus diagnostic fees if done at a shop.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.