Symptom Chart - Power Transfer Unit (PTU)

SYMPTOM CHART - POWER TRANSFER UNIT (PTU)

Condition	Possible Sources	Action
The Power Transfer Unit (PTU) makes noise	Tire inflation pressure Tire and wheel size	MAKE SURE all tires and wheels are the same size and brand and the inflation pressures are correct.
	Fluid level	FILL with the correct type and amount of lubricant. REFER to Power Transfer Unit (PTU) Draining and Filling .
	Internal components	OPERATE the vehicle in all gears. If there is noise in the transaxle in NEUTRAL, or in some gears and not in others, REMOVE and REPAIR the transaxle. Refer to the appropriate Automatic Transmission article for the procedure. If there is noise in all gears, INSTALL a new PTU. REFER to Power Transfer Unit (PTU) .
Leaking fluid from the PTU vent	PTU over filled	REFER to Analysis of Leakage .
Leaking automatic transmission fluid	PTU intermediate shaft seal PTU compression seal	REFER to Analysis of Leakage .
Leaking gear lubricant from the seals	The PTU vent is plugged (located on top of the PTU)	INSTALL a new PTU. REFER to Power Transfer Unit (PTU) .
	Damaged seals	REFER to Analysis of Leakage .
Vehicle has no or inadequate torque at rear wheels	Rear axle	REFER to REAR DRIVE AXLE/DIFFERENTIAL article.
	PTU mechanical failure	REFER to Power Transfer Unit (PTU) .
Vehicle binds in a turn or resists turning/pulsates or shudders in a straight line	Wheels/tires	REFER to WHEELS AND TIRES article.
	Brake system	REFER to BRAKE SYSTEM - GENERAL INFORMATION article.
	Wheel bearings	REFER to SUSPENSION SYSTEM - GENERAL INFORMATION article.
	Halfshafts	REFER to DRIVELINE SYSTEM - GENERAL INFORMATION article.
	Wheel speed sensor(s)	REFER to VEHICLE DYNAMIC SYSTEMS article.
	ABS module	REFER to VEHICLE DYNAMIC SYSTEMS article.