Cummins fault code3739 · Intake Manifold 1 Temperature
Intake Manifold 1 Temperature - Data Valid But Below Normal Operating Range - Least Severe Level
3739 Cummins fault code as shown in INSITE / CaltermSPN105 · Intake Manifold 1 TemperatureFMI17 Data valid but below normal operating range - least severe levelOBD codenone (J1939 only)LampNo lampCummins textIntake Manifold 1 Temperature - Data Valid But Below Normal Operating Range - Least Severe LevelFailure modeData Valid But Below Normal Operating Range - Least Severe LevelWhat Cummins code 3739 means
The reading for Intake Manifold 1 Temperature is believed to be correct, but it has gone slightly below the normal operating range. This is the least severe of the three "below range" levels (FMI 17, 18 and 1); it is usually an early warning rather than an immediate problem.
No dash lamp is attached to this code in the Cummins fault table. It is logged in the ECM and shows up in Cummins INSITE (or any J1939 tool reading DM1 / DM2), but on its own it does not light a lamp.
On a generic J1939 scan tool, or on the dash of a Freightliner, Kenworth, Peterbilt, International or Volvo chassis, the same fault is shown as SPN 105 FMI 17 rather than as Cummins code 3739. Cummins INSITE and Calterm show the Cummins number, the SPN / FMI pair and the lamp together.
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Find your ECFG →Other Cummins codes on SPN 105 Intake Manifold 1 Temperature
20 other fault codes share this SPN; each one is a different failure mode (FMI) of the same component.
Related Cummins fault codes
J1939 failure mode identifiers (FMI)
FMI 17 is highlighted. The FMI is the second half of every J1939 fault and tells you how the component failed; the SPN tells you which component.
| FMI | Meaning (SAE J1939-73) |
|---|---|
| 0 | Data valid but above normal operational range - most severe level |
| 1 | Data valid but below normal operational range - most severe level |
| 2 | Data erratic, intermittent or incorrect |
| 3 | Voltage above normal, or shorted to high source |
| 4 | Voltage below normal, or shorted to low source |
| 5 | Current below normal or open circuit |
| 6 | Current above normal or grounded circuit |
| 7 | Mechanical system not responding or out of adjustment |
| 8 | Abnormal frequency, pulse width or period |
| 9 | Abnormal update rate |
| 10 | Abnormal rate of change |
| 11 | Root cause not known |
| 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 |
| 22 | Reserved for SAE assignment |
| 23 | Reserved for SAE assignment |
| 24 | Reserved for SAE assignment |
| 25 | Reserved for SAE assignment |
| 26 | Reserved for SAE assignment |
| 27 | Reserved for SAE assignment |
| 28 | Reserved for SAE assignment |
| 29 | Reserved for SAE assignment |
| 30 | Reserved for SAE assignment |
| 31 | Condition exists |
Questions about code 3739
What does Cummins fault code 3739 mean?
Cummins 3739 is "Intake Manifold 1 Temperature - Data Valid But Below Normal Operating Range - Least Severe Level". It maps to SPN 105 FMI 17. The reading for Intake Manifold 1 Temperature is believed to be correct, but it has gone slightly below the normal operating range. This is the least severe of the three "below range" levels (FMI 17, 18 and 1); it is usually an early warning rather than an
Which lamp does fault code 3739 turn on?
No lamp: No dash lamp is attached to this code in the Cummins fault table. It is logged in the ECM and shows up in Cummins INSITE (or any J1939 tool reading DM1 / DM2), but on its own it does not light a lamp.
How do I clear or permanently delete Cummins code 3739?
An active code goes inactive on its own once the condition is gone; the inactive record stays in the ECM fault history until it is cleared with Cummins INSITE (or a J1939 tool that supports the DM3 / DM11 clear). If the code keeps coming back because the part is gone, disconnected or not worth repairing, the lasting fix is to disable fault 3739 in the calibration: upload your .xcal to the ECFG Superstore file service, custom DTC delete from $150 (up to 30 codes), full DPF / EGR / SCR delete $500, and flash the returned file with Calterm or INSITE.
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