Cummins fault code2 · Exhaust Gas Pressure Sensor Circuit #1
Exhaust Gas Pressure Sensor Circuit #1 - Voltage below normal, or shorted to low source
2 Cummins fault code as shown in INSITE / CaltermSPNnot assigned (Cummins proprietary code)FMI4 Voltage below normal, or shorted to low sourceOBD codenone (J1939 only)LampNo lampCummins textExhaust Gas Pressure Sensor Circuit #1 - Voltage below normal, or shorted to low sourceFailure modeVoltage below normal, or shorted to low sourceWhat Cummins code 2 means
The signal wire for Exhaust Gas Pressure Sensor Circuit #1 is sitting below the voltage window the ECM expects. In practice that is usually a short to ground, a short to the sensor return, a failed sensor, or a missing 5 V supply.
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 its SPN FMI 4 rather than as Cummins code 2. Cummins INSITE and Calterm show the Cummins number, the SPN / FMI pair and the lamp together.
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Find your ECFG →Related Cummins fault codes
J1939 failure mode identifiers (FMI)
FMI 4 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 2
What does Cummins fault code 2 mean?
Cummins 2 is "Exhaust Gas Pressure Sensor Circuit #1 - Voltage below normal, or shorted to low source". It maps to no SPN FMI 4. The signal wire for Exhaust Gas Pressure Sensor Circuit #1 is sitting below the voltage window the ECM expects. In practice that is usually a short to ground, a short to the sensor return, a failed sensor, or a missing 5 V supply.
Which lamp does fault code 2 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 2?
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 2 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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