P0318 - Rough Road Sensor A Signal Circuit

The ECM detected a fault in rough-road sensor A signal circuit.

Treat the code as the starting point: compare symptoms, likely causes, and repair paths before pricing parts or moving into an estimate.

Code Overview

The ECM detected a fault in rough-road sensor A signal circuit.

Common Causes

• Failed rough-road sensor
• Wiring problem
• Module communication issue

Diagnostic Steps

1. Inspect sensor wiring and connectors
2. Check for related ABS or chassis faults
3. Verify the signal with scan data if supported

Likely Repairs & Cost Guides

Use symptoms, scan data, and quick checks to confirm the likely repair path before pricing parts. The estimator helps compare repair paths before replacing anything unnecessarily.

Related OBD Codes

Browse nearby code-family pages when the same fault pattern overlaps across systems, such as misfire, lean fuel trim, EVAP sealing, cooling, or charging faults.

Next Steps

Move from code lookup to diagnosis, then estimate the likely repair only after symptoms, causes, and checks point to the same path.