Scania RET DTC 21010 Time-out in CAN communication from the coordinator

RET Retarder · Scania · 2 variants

Code 21010 (decimal). Some diagnostic tools show it in hexadecimal as 5212.

In short

Timeout from coordinator.

Variant 1

Applies to: OPC4 (RET)

What does Scania RET fault code 21010 mean?

What causes Scania DTC 21010?

How does the system react?

How to fix Scania RET fault code 21010?

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: OPC5 (RET2)

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

Code 21010 in other Scania systems