Cummins fault code12651 · VGT2 (Twin VGT Setup) VGT Actuator Controller /Driver Circuit
VGT2 (Twin VGT Setup) VGT Actuator Controller /Driver Circuit - Out of Calibration
12651 Cummins fault code as shown in INSITE / CaltermSPN516112 · VGT2 (Twin VGT Setup) VGT Actuator Controller /Driver CircuitFMI13 Out of calibrationOBD codenone (J1939 only)LampRed STOP lampCummins textVGT2 (Twin VGT Setup) VGT Actuator Controller /Driver Circuit - Out of CalibrationFailure modeOut of CalibrationWhat Cummins code 12651 means
The calibration data stored for VGT2 (Twin VGT Setup) VGT Actuator Controller /Driver Circuit does not match what the ECM measures or expects. This can be an adaptive value that has drifted outside limits, a component that was replaced without the matching learn procedure, or calibration data that is missing or corrupt.
It turns on the red STOP ENGINE lamp. Cummins classes this as a fault that can damage the engine or aftertreatment if ignored: stop as soon as it is safe to do so. Many calibrations also apply an engine-protection derate while the fault is active.
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 516112 FMI 13 rather than as Cummins code 12651. 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 516112 VGT2 (Twin VGT Setup) VGT Actuator Controller /Driver Circuit
7 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 13 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 12651
What does Cummins fault code 12651 mean?
Cummins 12651 is "VGT2 (Twin VGT Setup) VGT Actuator Controller /Driver Circuit - Out of Calibration". It maps to SPN 516112 FMI 13. The calibration data stored for VGT2 (Twin VGT Setup) VGT Actuator Controller /Driver Circuit does not match what the ECM measures or expects. This can be an adaptive value that has drifted outside limits, a component that was replaced without the matching
Which lamp does fault code 12651 turn on?
Red STOP lamp: It turns on the red STOP ENGINE lamp. Cummins classes this as a fault that can damage the engine or aftertreatment if ignored: stop as soon as it is safe to do so. Many calibrations also apply an engine-protection derate while the fault is active.
How do I clear or permanently delete Cummins code 12651?
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 12651 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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