Symptom Chart

For overdrive clutch operation, REFER to: Transmission Description . REFER to: Transmission Description - System Operation and Component Description . REFER to: Overdrive Clutch Assembly .

NOTE: The Low Reverse and Overdrive clutches use SSD, CBLR/C456 regulator valve, SSD SIG and CBLR/C456 SUPPLY hydraulic circuits, and the multiplex shift valve. Faults with these components will affect reverse, 1, 4, 5 and 6 gears. If the vehicle operates correctly in first and reverse, these components are functioning properly

Overdrive Clutch

Condition	Possible Sources	Action
Overdrive clutch does not apply	SSD filter screen blocked	CLEAN or INSTALL a new solenoid. REFER to: Solenoid .
	SSD is mechanically stuck OFF	INSTALL a new solenoid. REFER to: Solenoid .
	Overdrive clutch (CBLR/C456) regulator valve stuck OFF	DISASSEMBLE, CLEAN and INSPECT the overdrive clutch regulator valve. If bore or valve is damaged, INSTALL a new main control. REFER to: Main Control Valve Body .
	SSD SIG, CBLR/C456 SUPPLY, C456 SUPPLY, C456 hydraulic circuits blocked/leaking	DISASSEMBLE and INSPECT the main control valve body and separator plate passages for debris/blockage. CLEAN as necessary. REFER to: Main Control Valve Body .
	Multiplex shift valve stuck in applied position	DISASSEMBLE, CLEAN and INSPECT the multiplex shift valve. If bore or valve is damaged, INSTALL a new main control valve body. REFER to: Main Control Valve Body .
	C456 supply hydraulic circuit blocked or leaking	DISASSEMBLE and INSPECT the transmission cover and support tower passages for debris/blockage. CLEAN as necessary. REFER to: Transmission .
	Rear planetary carrier/center ring gear	INSPECT the planetary carrier/center ring gear for wear and damage. INSTALL new components necessary. REFER to: Transmission .
	Overdrive clutch friction plates	DISASSEMBLE and INSPECT the overdrive clutch friction and steel plates. INSTALL new components as necessary. REFER to: Transmission .
	Overdrive clutch piston seal leakage	INSPECT the overdrive clutch piston and seals. INSTALL new components as necessary. REFER to: Transmission .
Overdrive clutch always applied	SSD O-rings damaged	INSTALL a new solenoid. REFER to: Solenoid .
	SSD mechanically stuck ON	INSTALL a new solenoid. REFER to: Solenoid .
	Overdrive clutch regulator (CBLR/C456) valve stuck ON	DISASSEMBLE, CLEAN and INSPECT the overdrive clutch regulator valve and bias spring. If bore or valve is damaged, INSTALL a new main control valve body. REFER to: Main Control Valve Body .
	SSD SIG, CBLR/C456 SUPPLY, C456 SUPPLY, C456 hydraulic circuits blocked/leaking	DISASSEMBLE and INSPECT the main control valve body and separator plate passages for leakage. CLEAN as necessary. REFER to: Main Control Valve Body .
	Overdrive clutch friction plates	DISASSEMBLE and INSPECT the overdrive clutch friction and steel plates. INSTALL new components as necessary. REFER to: Transmission .
	Overdrive clutch piston return spring.	INSPECT the return spring for damage. INSTALL new components as necessary. REFER to: Transmission .
Overdrive clutch delayed/soft/slipping apply	Incorrect Transmission Strategy programmed into PCM	Remove SSD and record solenoid band number. REFER to: Solenoid . Using the scan tool, verify the correct band number is stored in the PCM. If band numbers do not match, replace SSD with correct band number.
	SSD filter screen partially blocked	INSTALL a new solenoid. REFER to: Solenoid .
	SSD mechanically sticking	INSTALL a new solenoid. REFER to: Solenoid .
	Overdrive clutch regulator (CBLR/C456) valve stuck ON	DISASSEMBLE, CLEAN and INSPECT the overdrive clutch regulator valve. If bore or valve is damaged, INSTALL a new main control valve body. REFER to: Main Control Valve Body .
	SSD SIG, CBLR/C456 SUPPLY, C456 SUPPLY, C456 hydraulic circuits blocked/leaking	DISASSEMBLE and INSPECT the main control valve body and separator plate passages for leakage. CLEAN as necessary. REFER to: Main Control Valve Body .
	Multiplex shift valve sticking	DISASSEMBLE, CLEAN and INSPECT the multiplex shift valve. If bore or valve is damaged, INSTALL a new main control valve body. REFER to: Main Control Valve Body .
	C456 supply hydraulic circuit blocked or leaking	DISASSEMBLE and INSPECT the transmission cover and support tower passages for debris/blockage. CLEAN as necessary. REFER to: Transmission .
	Overdrive clutch friction plates	DISASSEMBLE and INSPECT the overdrive clutch friction and steel plates. INSTALL new components as necessary. REFER to: Transmission .
	Overdrive clutch piston seal leakage	INSPECT the overdrive clutch piston and seals. INSTALL new components as necessary. REFER to: Transmission .
Overdrive clutch harsh apply	Incorrect Transmission Strategy programmed into PCM	Remove SSD and record solenoid band number. REFER to: Solenoid . Using the scan tool, verify the correct band number is stored in the PCM. If band numbers do not match, replace SSD with correct band number.
	SSD O-rings damaged	INSTALL a new solenoid. REFER to: Solenoid .
	SSD mechanically sticking	INSTALL a new solenoid. REFER to: Solenoid .
	Overdrive clutch regulator (CBLR/C456) valve sticking	DISASSEMBLE, CLEAN and INSPECT the overdrive clutch regulator valve. If bore, valve or spring is damaged, INSTALL a new main control valve body. REFER to: Main Control Valve Body .
	Overdrive clutch (CBLR/C456) boost valve sticking	DISASSEMBLE, CLEAN and INSPECT the overdrive clutch boost valve and bias spring. If bore, valve or spring is damaged, INSTALL a new main control valve body. REFER to: Main Control Valve Body .
	SSD SIG, CBLR/C456 SUPPLY, C456 SUPPLY, C456 hydraulic circuits blocked/leaking	DISASSEMBLE and INSPECT the main control valve body and separator plate passages for debris/blockage. CLEAN as necessary. REFER to: Main Control Valve Body .
	Overdrive clutch friction plates	DISASSEMBLE and INSPECT the overdrive clutch friction and steel plates. INSTALL new components as necessary. REFER to: Transmission .
	Overdrive clutch piston return spring	INSPECT the return spring for proper installation and damage. INSTALL new components as necessary. REFER to: Transmission .