P0319 code meaning
Rough Road Sensor B Signal Circuit
What P0319 means
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.
P0319 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0319
- Warning light (manufacturer-dependent, often none)
- Possibly ABS or transmission codes
- Driving unaffected
Common causes of P0319
- Most likelySignal source B or its wiring faulty
- PossibleCommunication fault to the supplying module (ABS, transmission)
- Less likelyConfiguration or software
- Less likelyEngine module faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Rough road sensor bWiringEngine control module
What each part of P0319 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 3 | Area: ignition system or misfire. |
| 19 | The exact fault in that area. |
What to do next
- Note P0319 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0319
What does P0319 mean?
P0319 means "Rough Road Sensor B Signal Circuit". Misfire detection works from crankshaft speed fluctuations, which rough roads also cause. It is a generic code, so it means the same on every make.
Is it safe to drive with P0319?
P0319 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will P0319 fail an emissions test?
P0319 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is P0319 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P0319 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.