Scania EMS DTC 139012 Exhaust gas aftertreatment – reductant heater H502

EMS Engine Management System · Scania

Code 139012 (decimal). Some diagnostic tools show it in hexadecimal as 021F04.

In short

The heater is short-circuited to ground.

Applies to: EMS LCS1

What does Scania EMS fault code 139012 mean?

What causes Scania DTC 139012?

How does the system react?

How to fix Scania EMS fault code 139012?

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