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SPN 520 FMI 19

Actual Retarder – Percent Torque — Received network data in error.
Data received from another module over the network was flagged as an error or not available.

What the SPN covers: How much braking torque the retarder or engine brake is actually producing, as a percentage. More on SPN 520.

What FMI 19 usually points to: The problem is usually in the module that sends the data, not the one that logged the code. More on FMI 19.

Severity

MEDIUM — fix soon

Your engine brake or retarder may not work. Drive with extra caution on grades.

Likely causes

  1. Retarder or engine brake control problem
  2. Network message missing or invalid
  3. Faulty retarder module or sensor

Checks & fixes (easiest first)

  1. Check for other network codes and the module that sends this data
  2. Inspect the J1939 backbone and terminating resistors
  3. Check retarder/engine brake operation and switch inputs
  4. Check for J1939 network codes
  5. Check codes in the retarder or transmission module

FAQ

What does SPN 520 FMI 19 mean?

Actual Retarder – Percent Torque — received network data in error. Data received from another module over the network was flagged as an error or not available.

Is SPN 520 FMI 19 serious?

Your engine brake or retarder may not work. Drive with extra caution on grades.

What should I check first for SPN 520 FMI 19?

Check for other network codes and the module that sends this data; Inspect the J1939 backbone and terminating resistors; Check retarder/engine brake operation and switch inputs.