P0319 indicates a fault in the Rough Road (RRC) Sensor B circuit, which monitors vehicle vibration and wheel speed to help the transmission and stability controls adapt to rough surfaces.
Frayed, corroded, or broken wires or connectors in the RRC‑B circuit are the most common cause of a P0319 code.
The sensor itself can fail electrically or mechanically, sending an out‑of‑range signal.
A sensor that is loose, misaligned, or impacted by debris can produce erratic readings that trigger the code.
A weak or missing ground, or a bad power supply voltage, will cause the control module to detect a circuit fault.
Only after ruling out the sensor and wiring should a malfunction inside the powertrain control module be considered, which is rare.
No. The PCM is rarely the cause of P0319. Replacing it without confirming a sensor or wiring fault usually does not resolve the issue and adds unnecessary cost.
After repairing the wiring or sensor, clear the code with a scan tool and drive the vehicle. If the repair was correct, the code should not return.
The Rough Road sensor feeds data used by the ABS/traction control system, so a fault can trigger ABS or stability‑control warnings, but the code itself originates from the powertrain control module.
Because the sensor influences transmission shift quality and stability‑control functions, it should be diagnosed and repaired promptly to avoid degraded performance or limp‑mode activation.