Rough Road Hardware Not Present
The PCM has detected that rough road detection hardware is not present or not functioning properly. This code indicates the vehicle's road condition sensing system (accelerometer, road sensor, or ABS wheel sensors) is unavailable or malfunctioning, preventing the engine control module from properly compensating for rough driving surfaces.
What You Might Notice
- Check engine light not illuminated (MIL off)
- Traction control or ABS warning lights may be on
- Engine misfires or rough idle detected
- Rough running conditions noticed during acceleration
- Loss of rough road compensation features
Most Common Causes
- 1
Missing or Disabled Road Sensor Hardware
The vehicle's accelerometer or dedicated road condition sensor is not installed, disconnected, or disabled in the PCM programming.
- 2
ABS/EBCM Communication Failure
The Electronic Brake Control Module or ABS sensors that provide rough road data are not communicating properly with the PCM.
- 3
PCM Software Issue or Calibration
The engine control module may have incorrect software calibration or missing rough road detection feature programming for the specific vehicle.
- 4
Wiring or Connector Issues
Corroded, loose, or damaged wiring and connectors between the road sensing hardware and PCM prevent proper signal transmission.
How to Diagnose It
- 1
Check Missing or Disabled Road Sensor Hardware — The vehicle's accelerometer or dedicated road condition sensor is not installed, disconnected, or disabled in the PCM programming.
- 2
Check ABS/EBCM Communication Failure — The Electronic Brake Control Module or ABS sensors that provide rough road data are not communicating properly with the PCM.
- 3
Check PCM Software Issue or Calibration — The engine control module may have incorrect software calibration or missing rough road detection feature programming for the specific vehicle.
- 4
Check Wiring or Connector Issues — Corroded, loose, or damaged wiring and connectors between the road sensing hardware and PCM prevent proper signal transmission.
How to Fix It
- 1
Verify Hardware Presence and Installation
Check if the vehicle is equipped with road detection hardware (accelerometer or road sensor). Consult the service manual for your specific make/model to confirm if this feature is standard and verify proper installation.
- 2
Inspect and Repair Wiring Connections
Inspect all wiring harnesses and connectors between the road sensor, ABS module, and PCM for corrosion, damage, or loose connections. Clean contacts and secure connections as needed.
- 3
Update PCM Software or Calibration
Flash the PCM with the latest factory software calibration that includes proper rough road detection programming for your vehicle's year, make, and model.
- 4
Replace Road Detection Hardware
If hardware is faulty or missing, install the manufacturer-approved road sensor or accelerometer assembly according to service manual specifications.
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