Symptom Chart: NVH

WARNING: This page is about a different car, the 2018 Ford EcoSport. However, it is still accessible from the selected car via links, so may be relevant.

Symptom Chart

Condition	Possible Sources	Actions
Driveline clunk - loud clunk when shifting from REVERSE to DRIVE	Damaged or worn driveshaft CV joints	INSPECT the driveshaft CV joints for wear or damage. INSTALL a new driveshaft as necessary. Refer to: Driveshaft .
Driveline clunk -- occurs as the vehicle starts to move forward following a stop	Worn driveshaft CV joint with excessive play	INSPECT the driveshaft CV joint for a worn condition. INSTALL a new driveshaft if necessary. Refer to: Driveshaft .
Buzz - buzzing noise is the same at cruise or coast/deceleration	Incorrect driveline angles	CHECK for correct driveline angles. Refer to: Driveshaft Angle Measurement . REPAIR as necessary.
Rumble or Boom - noise occurs at coast/ deceleration, usually driveshaft speed-related and noticeable over a wide range of speeds	Driveshaft out of balance	CHECK the driveshaft for damage, missing weights or undercoating. INSTALL a new driveshaft as necessary. Refer to: Driveshaft .
Grunting -- normally associated with a shudder experienced during acceleration from a complete stop	Driveshaft CV joint binding	INSTALL a new driveshaft as necessary. Refer to: Driveshaft .
Driveline shudder - occurs during acceleration from a slow speed or stop	Driveline angles out of specification	CHECK for correct driveline angles. Refer to: Driveshaft Angle Measurement .
	Binding or damaged driveshaft CV joint	INSPECT the driveshaft CV joints and coupling shaft for wear or damage. INSTALL a new driveshaft as necessary. Refer to: Driveshaft .
Driveline vibration - occurs at cruising speeds	Worn or damaged driveshaft center bearing support	CHECK the insulator for damage or wear. ROTATE the driveshaft and CHECK for rough operation. INSTALL a new driveshaft as necessary. Refer to: Driveshaft .
	Loose axle pinion flange bolts	INSPECT the axle pinion flange. TIGHTEN the pinion flange bolts to specification. Refer to: Driveshaft .
	Excessive axle pinion flange runout	CARRY OUT a runout check. REPAIR as necessary.
	Driveshaft is out of balance	CHECK the driveshaft for damage, missing balance weights or undercoating. CHECK the driveshaft balance. Refer to: Driveshaft Runout and Balancing .
	Binding or damaged driveshaft CV joint	INSPECT the driveshaft CV joint for wear or damage. INSTALL a new driveshaft as necessary. Refer to: Driveshaft .
	Excessive driveshaft runout	CARRY OUT a runout check. Refer to: Driveshaft Runout and Balancing .
	Driveline angles out of specification	CHECK for correct driveline angles. Refer to: Driveshaft Angle Measurement . REPAIR as necessary.