Noise, Vibration and Harshness (NVH)

Symptom Chart

Condition(s):

High-speed shake

Possible Source(s):
- Wheel end vibration.
- Engine/gearbox/transfer box.
- Driveline.
Action(s) to take:
- GO to [Pinpoint Test A]. Pinpoint Tests

Tip-in moan

Possible Source(s):
- Air cleaner.
- Power steering (PS).
- Powertrain.
- Engine mounts.
- Exhaust system.
Action(s) to take:
- GO to [Pinpoint Test B]. Pinpoint Tests

Idle boom/shake/vibration, or shudder

Possible Source(s):
- Cable(s)/hoses(s).
- Engine mounts.
- Exhaust system.
- Belt/pulleys.
Action(s) to take:
- GO to [Pinpoint Test C]. Pinpoint Tests

Wheel end vibration analysis

Possible Source(s):
- Suspension/front or rear wheel drive half shaft and joints.
- Tires/wheels.
- Wheel bearings.
- Front or rear wheel drive half shaft joint boots.
Action(s) to take:
- GO to [Pinpoint Test D]. Pinpoint Tests

Non-axle noise
Possible Source(s):
- Trim/mouldings.
- A/C system.
- Accessories.
Action(s) to take:
- GO to [Pinpoint Test E]. Pinpoint Tests