What it means
The PCM has been configured to use rough-road sensor input for misfire detection (to mask false positives on bumpy surfaces) but the expected hardware is not detected on the network. Typically a configuration mismatch after replacement.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
Some vehicles use rough-road information to help the controller avoid mistaking bumps and wheel movement for engine misfires. P0317 means the controller expects rough-road sensing hardware but does not detect the expected input, which can happen if the hardware or vehicle configuration does not match.
Common causes
Most likely first.
- Rough-road sensor hardware missing or disconnected
- Control module configuration does not match the vehicle hardware
- Faulty wiring or communication between the module and sensor
Symptoms
- Check engine light on
- Misfire warning or reduced engine performance
- Rough running may be reported or misfire detection may be limited
How to diagnose it
- Scan for related chassis, network, and misfire codes and check freeze-frame data for clues about when the warning appeared.
- Check the vehicle’s service information or equipment configuration to confirm whether rough-road sensing hardware is fitted.
- Inspect the expected sensor and its connectors for disconnection or visible damage, using the vehicle’s wiring information to identify the correct components.
- Use a scan tool to check whether the relevant module reports rough-road sensor data and whether it is configured for the vehicle’s actual equipment.
- If the hardware is fitted but missing from the scan data, test its power, ground, signal, and communication circuits according to the manufacturer’s procedure.
Common fixes
- Reconnect a disconnected rough-road sensor or module connector.
- Repair damaged wiring or a poor connection in the rough-road sensing circuit.
- Replace a faulty rough-road sensor if circuit and scan tests identify it.
- Correct a control-module configuration mismatch using vehicle-specific service information.
Can I keep driving?
This code may limit the controller’s ability to distinguish road vibration from an engine misfire, so arrange diagnosis if a misfire warning or reduced performance appears. If the engine runs smoothly and the warning is steady, cautious driving is generally reasonable; stop if the light flashes or the engine misfires severely.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.