P0317Rough Road Hardware Not Present
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- Misfire detection works from crankshaft speed fluctuations, which rough roads also cause. CARB therefore allows misfire detection to pause on rough roads; many engines take a rough-road signal from the wheel speeds of the ABS module, a Ford patent describes such a detector. P0317 means the engine module is calibrated for an external rough-road signal but does not find the hardware: the supplying module does not respond on the data bus, or the configuration does not match the equipment – for example after replacing the engine or ABS module. Without the signal misfire detection cannot separate road bumps from misfires. No manufacturer document using P0317 was found; the description follows CARB and GM's rough-road sources in its misfire monitor.
- What you may notice
- Warning light (manufacturer-dependent)
- Misfire readiness not set
- Possibly false misfire codes on rough roads
- Likely causes
- LikelyModule configuration does not match the equipment (after engine or ABS module replacement)
- PossibleABS/ESP module not responding (supply, CAN line)
- RareSeparate rough-road sensor missing or unplugged, where fitted
- RareEngine module faulty
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €80 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.