Limp Home Mode

WARNING: This page is about a different car, the 2024 Kia Sorento. However, it is still accessible from the selected car via links, so may be relevant.

Features a fail-safe function that prevents dangerous situations in the event of a transaxle failure. The vehicle will be driven in limp home mode if the transaxle malfunctions. In this mode, the transaxle operates at a minimal functionality level (fixed shifting, limited shifting, reverse, neutral), making it possible for the vehicle to reach a service center.

Information

Limp Home Mode: Limited shifting

Mechanical limp home mode: Fixed shifting (failure of mechanical parts, solenoid valves, TCM, CAN communication)

NOTE: * If driving is not possible, replace the transaxle (no inspection required)
* If the clutch (friction material) is burnt and stuck or foreign matter from the damaged gear remains after removing the valve body cover, replace the transaxle assembly.
* Replace the transaxle assembly when the clutch/brake damaged

TROUBLESHOOTING REFERENCE

symptoms		Suspected areas	Remedy
Delayed shifting/shift shock while driving	1st → 2nd or 2nd → 1st	26 brake, OD clutch & LR brake solenoid valve fault (If shifting 3rd to 4th operates as normal, replace 26 brake solenoid valve) 26, LR brake fault	Replace the faulty solenoid valve Check for the clutch/brake abnormality Disc damage Piston D-ring damage Clutch sealing damage * Replace the transaxle assembly when the clutch/brake damaged * When a shift shock occurs, check the shift position in manual mode and reproduce the symptoms.
	2nd → 3rd or 3rd → 2nd	35R clutch, 26 brake solenoid valve fault (If shifting 1st to 2nd operates as normal, replace 35R solenoid valve) 35R clutch, 26 brake fault
	3rd → 4th or 4th → 3rd	OD, 35R clutch solenoid valve fault (If shifting 2nd to 3rd operates as normal, replace OD clutch solenoid valve) OD, 35R clutch fault
	4th → 5th or 5th → 4th	35R clutch, UD brake solenoid valve fault (If shifting N to D operates as normal, replace 35R solenoid valve) 35R clutch, UD brake fault
	5th → 6th or 6th → 5th	35R clutch, 26 brake solenoid valve fault (If shifting 2nd to 3rd operates as normal, replace 26 brake solenoid valve) 35R clutch, 26 brake fault
Shifting shock while stopped	N → D or N → R	D position: UD solenoid valve/clutch fault R position: 35R solenoid valve/clutch fault UD/35R clutch fault	Replace UD solenoid valve Replace 35R solenoid valve Inspect UD/35R clutch
P → D thumping noise (slope)		Sound occurs when the parking Sprague is released	Normal
Poor acceleration, shift delay and vehicle jerking		Faulty clutch/brake	Replace the clutch/brake
		Poor oil pressure control	Inspect solenoid valve
		Poor oil pressure control	Replace the valve body
		Poor oil pressure supply	Inspect oil level
			Oil cleanliness inspection
			Replace the EOP
			Replace the OPU
		TCM learning not performed	Perform TCM learning
		Transaxle mounting fault	Tight the mounting bolt with specified torque
		Speed sensor fault	Replace the speed sensor
		E-module fault	Replace the E-module
		Connector or wiring burn out	Inspect the connector or wiring
Noise, judger		Torsion damper fault	Replace the torsion damper
Mechanical limp home mode (locked into 4th, manual shifting disabled)		Faulty Solenoid valve	Inspect the solenoid valve
		Faulty Solenoid valve	Replace the valve body
		Faulty TCM	Replace the TCM
		Faulty CAN communication	Inspect the CAN communication line
Limp home mode (locked into 4th, manual shifting 2nd-4th enabled)		Faulty input & output speed sensor	Replace the input & output speed sensor
Limp home mode (1st-2nd shifting disabled, 3rd-6th shifting enabled)		Faulty inhibitor switch	Replace the inhibitor switch.
Manual shift disabled		TCM fault	Replace the TCM
		The connector connection fault	Check manual switch connector connection
		The manual mode switch fault	Replace the manual mode switch housing
HEV not driving (E/C limp home)		CAN communication fault	CAN communication line
		Engine clutch solenoid valve fault	Replace the engine clutch solenoid valve
		HSG, Motor, Battery etc. part fault	Inspect the power line Inspect the motor Inspect the high voltage battery etc.