Theory Of Operation

WARNING: This page is about a different car, the 2014 RAM 1500. However, it is still accessible from the selected car via links, so may be relevant.

The purpose of this diagnostic is to detect failures of the Wheel Speed Sensor signal via Bus and the Output Speed Sensor signal. The DTC is set when the difference between output speed and wheel speed is greater than a calibrated threshold during shifting, which depends on the axle ratio.

Incorrect tire size or axle gear ratio may influence this DTC. If the incorrect tire size is programmed into the Body Control Module (BCM), this can contribute to this DTC.

NOTE: A non-production size tire cannot be programmed into the BCM. The production Powertrain, with the production size tires, is the only emissions certified configuration that is available for reprogramming.

A driving surface that may create sufficient wheel speed differential such as operating on surfaces with unequal traction could cause this DTC. Mechanically, a damaged component such as a driveshaft, axle component, or transfer case could cause this DTC. If the vehicle is equipped with 4WD and operating in 4WD, the DTC may not set until an associated environmental condition also exists that allows a wheel speed differential to occur that should not occur when in 4WD.