Scania COO DTC 903 Coolant level

COO Coordinator · Scania · 4 variants

Code 903 (decimal). Some diagnostic tools show it in hexadecimal as 0387.

In short

The control unit interprets that the coolant level is too low.

Variant 1

Applies to: COO10 (COO)COO11 (COO)

What does Scania COO fault code 903 mean?

What causes Scania DTC 903?

How does the system react?

How to fix Scania COO fault code 903?

Read the full explanation with Premium

Causes, system reaction, symptoms and step-by-step repair instructions for every fault code are available to Premium members.

  • Full explanations of every code and brand
  • Causes, symptoms and repair steps
  • New brands and codes included
Get Premium – 7,50 € / month I already have an account

Yearly plan: pay 10 months, get 12. Cancel at any time.

Variant 2

Applies to: COO8 (COO)

Variant 3

Applies to: COO9 (COO)

Variant 4

Applies to: COO8

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

Code 903 in other Scania systems

Compare code 903 in every system →