Scania AMS DTC 1378 EEC, Control unit for exhaust gas aftertreatment

AMS AMS control unit · Scania

Code 1378 (decimal). Some diagnostic tools show it in hexadecimal as 0562.

In short

The battery voltage to the EEC control unit has been below 9 V.

Applies to: AMS1

What does Scania AMS fault code 1378 mean?

The battery voltage to the EEC control unit has been below 9 V.

What causes Scania DTC 1378?

Fault in the cable harnesses or components involved in the voltage supply.

How does the system react?

The reductant pump is stopped, which leads to increased emissions.

How to fix Scania AMS fault code 1378?

  1. Start the engine and check the battery voltage.
  2. See under EEC > Check > Troubleshooting > System overview > Battery voltage.
  3. If the voltage is low, troubleshoot components that affect the voltage.
  4. If the voltage in other systems is correct when the engine is running and the fault persists, measure the voltage at the EEC control unit.
  5. If the voltage is too low, check the control unit cable harness.

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

Code 1378 in other Scania systems

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