Powertrain, generic · Ignition system or misfire

P0319 Rough Road Sensor B Signal Circuit

Check engine lightUsually off
EmissionsNot relevant
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. P0319 is like P0318, but for a second rough-road signal source B – depending on the manufacturer, for example an acceleration sensor or transmission output speed. The signal is missing or invalid, so misfire detection runs without its rough-road filter. No manufacturer using P0319 was found; following GM's handling of P0318, the warning light often stays off.

Likely causes

Signal source B or its wiring faulty
Communication fault to the supplying module (ABS, transmission)
Configuration or software
Engine module faulty

Symptoms

  • Warning light (manufacturer-dependent, often none)
  • Possibly ABS or transmission codes
  • Driving unaffected

Repair estimate

DifficultyMediumDIY possible
Parts and labour€50–400
Time0.5–2 h

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

Parts involved

rough road sensor bwiringengine control module

Related codes

P0317P0318P0300P0500

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