Symptom Table - Power Transfer Unit (PTU)

WARNING: This page is about a different car, the 2011 Mercury Milan and 2011 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM TABLE - 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 in this service information.
	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 AUTOMATIC TRANSAXLE/TRANSMISSION - 6F35 article, AUTOMATIC TRANSAXLE/TRANSMISSION - AISIN AW21 and/or AUTOMATIC TRANSMISSION - AUTOMATIC TRANSAXLE/TRANSMISSION - ELECTRONICALLY CONTROLLED CONTINUOUSLY VARIABLE TRANSMISSION (ECVT) article for the procedure. If there is noise in all gears, INSTALL a new PTU. REFER to POWER TRANSFER UNIT (PTU) in this service information.
Leaking fluid from the PTU vent	PTU over filled	REFER to ANALYSIS OF LEAKAGE in this service information.
Leaking Automatic Transmission Fluid (ATF)	Damaged seals	REFER to ANALYSIS OF LEAKAGE in this service information.
Leaking gear lubricant from the seals	Damaged seals	REFER to ANALYSIS OF LEAKAGE in this service information.
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) in this service information.
Vehicle has no or inadequate torque at rear wheels	Rear axle	REFER to REAR DRIVE AXLE/DIFFERENTIAL article.
Vehicle has no or inadequate torque at rear wheels	PTU mechanical failure	REFER to POWER TRANSFER UNIT (PTU) in this service information.
Vehicle binds in a turn or resists turning/ pulsates or shudders in a straight line	Wheels/tires	REFER to WHEELS & TIRES article.
	Brake system	REFER to BRAKE SYSTEM - GENERAL INFORMATION article.
	Wheel bearings	REFER to SUSPENSION SYSTEM - GENERAL INFORMATION article.
	Halfshafts	REFER to DRIVELING SYSTEM - GENERAL INFORMATION article.
	Wheel speed sensor(s)	REFER to ANTI-LOCK BRAKE SYSTEM (ABS) & STABILITY CONTROL SYSTEM (SCS) article.
	ABS module	REFER to ANTI-LOCK BRAKE SYSTEM (ABS) & STABILITY CONTROL SYSTEM (SCS) article.