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P0317Rough Road Hardware Not Present

The engine computer expects rough-road detection hardware or data on this vehicle but cannot find it.

Definition

Misfire monitors can be fooled by rough pavement, so many vehicles feed the PCM a rough-road signal — either from a dedicated accelerometer or from wheel-speed data supplied by the ABS module over the data bus — and temporarily suspend misfire detection when the surface is bad. P0317 sets when the PCM is configured to use that input but the hardware or bus message is absent, most often because of an ABS module or network problem, or because a replacement PCM was programmed with the wrong vehicle configuration. Driveability is unaffected, but the misfire monitor may set false misfire codes on rough roads and the MIL will be on, which can cause an emissions-inspection failure.

Common causes

  • Lost communication with the ABS/EBCM module that supplies wheel-speed rough-road data
  • Blown ABS fuse or failed ABS module
  • Incorrect PCM programming or vehicle configuration after a module replacement
  • Damaged CAN/data bus wiring between the ABS module and PCM
  • Rough-road (G) sensor missing or disconnected on vehicles so equipped

Common misdiagnoses

  • PCM replaced when the ABS module or bus wiring is the real fault
  • Wheel speed sensors replaced without checking module communication first
  • Ignition parts replaced chasing rough-road-induced false misfire codes
  • New rough-road sensor installed on a vehicle that derives the signal from ABS data

Troubleshooting steps

  1. 1.Scan every module, not just the PCM

    Look for U-series communication codes and ABS codes; a dead or offline ABS module is the most common trigger for P0317.

  2. 2.Verify ABS module power and ground

    Check the ABS fuses with a test light under load and confirm the module reports on the data bus with a scan tool topology view.

  3. 3.Confirm PCM configuration matches the vehicle

    If the PCM, ABS module, or software was recently replaced or updated, verify the VIN and option programming — a mismatch makes the PCM look for hardware the vehicle uses differently.

  4. 4.Inspect data bus wiring

    Measure roughly 60 Ω across CAN high/low at the DLC (two terminating 120 Ω resistors in parallel) and inspect connectors for corrosion or backed-out pins.

  5. 5.Check for a dedicated rough-road sensor per the build

    On vehicles equipped with a separate G-sensor, confirm it is present, connected, and its circuits are intact before condemning modules.

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