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Fault code
Meaning of the fault code
(Hex)
possible reason for fault detection
B1
Slippage at clutch K1
TCU calculates a differential speed at
closed clutch K1. If this calculated value
is out of range, TCU interprets this as
slipping clutch
Low pressure at clutch K1
Low main pressure
Wrong signal at internal speed sensor
Wrong signal at output speed sensor
Wrong size of the sensor gap
Clutch is defective
B2
Slippage at clutch K2
TCU calculates a differential speed at
closed clutch K2. If this calculated value
is out of range, TCU interprets this as
slipping clutch
Low pressure at clutch K2
Low main pressure
Wrong signal at internal speed sensor
Wrong signal at output speed sensor
Wrong size of the sensor gap
Clutch is defective
B3
Slippage at clutch K3
TCU calculates a differential speed at
closed clutch K3. If this calculated value
is out of range, TCU interprets this as
slipping clutch
Low pressure at clutch K3
Low main pressure
Wrong signal at internal speed sensor
Wrong signal at output speed sensor
Wrong size of the sensor gap
Clutch is defective
Reaction of the TCU
TCU shifts to neutral
OP mode : Limp home
If failure at another clutch is
pending
TCU shifts to neutral
OP mode : TCU shutdown
TCU shifts to neutral
OP mode : Limp home
If failure at another clutch is
pending
TCU shifts to neutral
OP mode : TCU shutdown
TCU shifts to neutral
OP mode : Limp home
If failure at another clutch is
pending
TCU shifts to neutral
OP mode : TCU shutdown
3-29
Possible steps to repair
Check pressure at clutch K1
Check main pressure in the
system
Check sensor gap at internal
speed sensor
Check sensor gap at output speed
sensor
Check signal at internal speed
sensor
Check signal at output speed
sensor
Replace clutch
Check pressure at clutch K2
Check main pressure in the
system
Check sensor gap at internal
speed sensor
Check sensor gap at output speed
sensor
Check signal at internal speed
sensor
Check signal at output speed
sensor
Replace clutch
Check pressure at clutch K3
Check main pressure in the
system
Check sensor gap at internal
speed sensor
Check sensor gap at output speed
sensor
Check signal at internal speed
sensor
Check signal at output speed
sensor
Replace clutch
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