SPN FMI Code List

This spn fmi codes help explain the underlying meaning of the numerical components which build an engine fault code.

- This is not a comprehensive list, or an alternative to the standard fault diagnostic process and only serves as a supplemental reference.
- For a complete reference see SAE documentation regarding Serial Control and Communications

FMI Errors

Common FMI errors from 0 to 21 numbers.

Code Explanation
0 Data valid but above normal operational range (that is, engine overheating)
1 Data valid but below normal operational range (that is, engine oil pressure too low)
2 Data erratic, intermittent, or incorrect
3 Voltage above normal or shorted high
4 Voltage below normal or shorted low
5 Current below normal or open circuit
6 Current above normal or grounded circuit
7 Mechanical system not responding properly
8 Abnormal frequency, pulse width, or pending
9 Abnormal update rate
10 Abnormal rate of change
11 Failure mode not identifiable
12 Bad intelligent device or component
13 Out of calibration
14 Special instructions
15 Data valid but above normal operating range - least severe level
16 Data valid but above normal operating range - moderately severe level
17 Data valid but below normal operating range - least severe level
18 Data valid but below normal operating range - moderately severe level
19 Received network data in error
20 Data drifted high
21 Data drifted low

SPNFMI Faults and Engine error code check tool. SPN code listing with names and descriptions.

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