Scania AMS DTC 4423 Communication error, exhaust back pressure from EMS

Q: What does Scania AMS fault code 4423 mean?

Communication error, exhaust back pressure from EMS. The EEC control unit has detected an error in the CAN communication from the EMS control unit regarding exhaust back pressure . Code 4423 (decimal). Some diagnostic tools show it in hexadecimal as 001147.

Q: How to fix Scania AMS fault code 4423?

- Check primary fault codes in EMS. - Check the engine control unit software version. Update the software if necessary. - If the fault persists, create a defect report.

AMS AMS control unit · Scania

Code 4423 (decimal). Some diagnostic tools show it in hexadecimal as 001147.

In short

The EEC control unit has detected an error in the CAN communication from the EMS control unit regarding exhaust back pressure .

Applies to: AMS2

What does Scania AMS fault code 4423 mean?

The EEC control unit has detected an error in the CAN communication from the EMS control unit regarding exhaust back pressure .

What causes Scania DTC 4423?

Secondary fault. - Software bug in the engine control unit. - Fault in the cable harness or harness-to-harness connector between the EEC control unit and the engine control unit. - Internal fault in the engine control unit.

How to fix Scania AMS fault code 4423?

Check primary fault codes in EMS.
Check the engine control unit software version.
Update the software if necessary.
If the fault persists, create a defect report.

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