System: Powertrain (P-Code)
SAE Standard (Generic)
Family: Misfire Rough Road Sensor
Code P0318: Rough Road Sensor A Signal Circuit
Diagnostic & Technical Explanation
Code P0318 (Rough Road Sensor A Signal Circuit) relates to the accelerometer-based rough-road sensor some platforms use to prevent false misfire counts when the crankshaft speed signal is disturbed by a bumpy road rather than an actual combustion event. Causes are a missing or uncalibrated rough-road option module, an open or shorted sensor signal circuit, or corroded connector pins at the sensor's mounting location under the vehicle.
First-listed procedure
Rank #1
Inspect and reseat the rough-road sensor connector
Easy DIY
This is the first procedure in the authored
consideration order, not a measured cause likelihood. Execute it only when its prerequisites
and diagnostic findings support it. Its cost and labor estimates (where known), the step-by-step procedure and the
remaining 3 procedure(s) are in the licensed dataset. Ordering context.
Full family: Misfire Rough Road Sensor
What this page does not show
This page publishes the fault mechanism and the code index. The licensed dataset adds, for
every one of the 15,886 codes, the full authored repair set (56,729 procedures in total)
with the fields deliberately withheld here:
- Procedures 2..n after the first-listed procedure
- Aftermarket parts cost ranges in USD (
est_parts_cost_min/max_usd)
- Professional labor-hour estimates (
est_labor_hours)
- Step-by-step diagnostic and repair instructions
- Replacement-part mappings and catalog lookups
- 6,637 manufacturer-specific OEM codes across 32 makes ($149 tier)