Powertrain, generic · Ignition system or misfire

P0317 Rough Road Hardware Not Present

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

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.

Likely causes

Module configuration does not match the equipment (after engine or ABS module replacement)
ABS/ESP module not responding (supply, CAN line)
Separate rough-road sensor missing or unplugged, where fitted
Engine module faulty

Symptoms

  • Warning light (manufacturer-dependent)
  • Misfire readiness not set
  • Possibly false misfire codes on rough roads

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–600
Time0.5–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

abs moduleengine control modulecan bus

Related codes

P0318P0319P0300U0121P0500

References: law.cornell.edu, gsi.ext.gm.com, patents.google.com.