Scania fault code 551
Code 551 is used by 10 different Scania systems. Choose the control unit shown in your diagnostic tool:
EMS Engine Management System
Post injection ontime too long, cylinder 7.
The error is detected when the post injection ontime, for either post1 or post2, has been consequtively too long for a period of time.
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VDT
CAN bus
Fault in CAN messages that contain accelerator pedal position information.
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COO Coordinator
COO control unit, internal fault
The control unit has interpreted an internal fault.
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CUV Visibility system
Parking light
Current consumption on the control unit output has fallen below 0.1 A for five seconds.
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BCI
Expansion unit, supply voltage
Expansion unit supply voltage is too low. The supply voltage should be between 16 V and 32 V.
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LAS Locking and Alarm System
Motion sensor in the cab
Timeout error in LIN communication.
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CMS
Supply voltage [V]
The supply voltage to the chassis management system control unit has been too low, below 16 V.
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ALM
Micro switch reserved pin (truck)/micro switch A10 (bus), short circuit
The micro switch is short-circuited to the voltage supply.
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EST
Motor pump unit
The voltage supply is too low to drive the motor pump unit.
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ESTA
Motor pump unit
The voltage supply is too low to drive the motor pump unit.
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