Resonating Vibration Type Noise While Driving From The Rear Of THe Vehicle - keywords drone moan

This PI is being superseded to update model year. Please discard PIP3916.

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Drone, moan, rotational, resonation type vibration noise from the rear of the vehicle that can be at any speed but is generally most noticeable at 35-50 mph (56-80 kph). The noise may be described as a "helicopter" type noise.

Isolate the noise to the RDM (rear drive module) by driving the vehicle with the rear prop shaft removed, then swapping a prop shaft from a known good vehicle.

If all vehicle options must be turned down or off i.e. radio to hear the noise, no repairs should be attempted at this time as engineering is investigating the noise.

If the noise can be heard over a normal radio listening level or is louder than a comparison vehicle, the RDM should be replaced as an assembly.

This PI will be updated when repair information becomes available.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.