C0040 on Jeep

Both the MK (2007-2016) and MP (2017+) Compass use a sealed rear hub/bearing unit that owners report failing as early as 30,000-40,000 miles, frequently repeating on the same corner within a year of replacement. Owners describe a growl or hum that rises with speed and changes when swerving; on 4x4 MP models the noise is often first blamed on tires. Multiple forum members document second and third bearing replacements on the same vehicle, and dealers have chased the same complaint through tire rotations and TSB 08-095-18 (rear-end noise) before replacing the hub. The rear hub is not serviceable separately - the bearing, hub and ABS tone ring come as one pressed unit.

NHTSA complaints and owner reports describe intermittent ABS/ESC warnings on Grand Wagoneer tied to wheel speed sensor signal loss or erratic readings, sometimes after wet weather or road debris impacts. When the system detects implausible wheel speed data, it can disable ABS/ESC functions and illuminate multiple warnings.

The front hub-and-bearing assemblies are a wear item on the Patriot rather than a lifetime part, and owners report failures well under 100,000 miles. The signature is a low grinding or whirring hum that rises with road speed and changes when the vehicle is loaded in a corner - louder turning one direction, quieter the other. Because the ABS tone ring is integral to the bearing on this platform, a failing bearing frequently trips the ABS, ESP/BAS and traction-control lights together, which sends owners chasing a wheel-speed sensor that is not actually bad. Forum owners note that a bearing can be audibly failing for a long time while still showing no play at the 12-and-6 rock test, so a no-play result does not clear it.

Front (and sometimes rear) sealed wheel hub/bearing assemblies are a high-wear item on JK and JL Wranglers, especially on lifted rigs running larger tires that load the bearing harder. As the bearing wears it produces a speed-dependent grinding, rumbling, or humming that changes when turning, and free play can be felt by rocking the tire at the 12-and-6 positions. Because the ABS wheel-speed sensor (tone ring/sensor) is integrated into the hub assembly on these models, a failing hub commonly damages the sensor and triggers ABS and traction-control (ESC) warning lights along with disabled stability control. The common service hub assembly for 2007-2016 5-lug JK with ABS is part 513272 (Mopar/MOOG/Timken/Spicer equivalents); note a JK hub part-number change around 2011, so the correct year-specific part must be used.