Scania BCI DTC 551 Expansion unit, supply voltage

BCI BCI control unit · Scania · 6 variants

Code 551 (decimal). Some diagnostic tools show it in hexadecimal as 0227.

In short

Expansion unit supply voltage is too low.

Variant 1

Applies to: BCI E1 (BWEXA)BCI E1 (BWEXC)BCI E1 (BWEXD)BCI E1 (BWEXF)BCI E1 (BWEXG)BCI E1 (BWEXI)

What does Scania BCI fault code 551 mean?

What causes Scania DTC 551?

How does the system react?

How to fix Scania BCI fault code 551?

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Variant 2

Applies to: BCI E1 (BWEXB)BCI E1 (BWEXE)BCI E1 (BWEXH)

Variant 3

Applies to: BCI B1 (BWEXBUS)BCI C1 (BWEXI)

Variant 4: Control unit, voltage supply

Applies to: BCI1 (BWE)BCI2 (BWE)

Variant 5: Control unit, voltage supply

Applies to: BCI2 (BWE)

Variant 6: Control unit, supply voltage

Applies to: BCI3 (BWE)

This information is for guidance only. Always follow the manufacturer workshop manual and safety procedures; if in doubt, contact an authorised workshop.

Code 551 in other Scania systems

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