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Cummins fault code154 · Engine Intake Manifold 1 Temperature

Engine Intake Manifold 1 Temperature - Voltage Below Normal or Shorted to Low Source

Fault code154 Cummins fault code as shown in INSITE / CaltermSPN105 · Intake Manifold 1 TemperatureFMI4 Voltage below normal, or shorted to low sourceOBD codeP0112LampAmber WARNING lampCummins textEngine Intake Manifold 1 Temperature - Voltage Below Normal or Shorted to Low SourceFailure modeVoltage Below Normal or Shorted to Low Source

What Cummins code 154 means

The signal wire for Engine Intake Manifold 1 Temperature 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.

It lights the amber CHECK ENGINE (warning) lamp. The engine keeps running, but a torque or speed derate may apply depending on the calibration and on how long the fault stays 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 105 FMI 4 rather than as Cummins code 154; an OBD-II reader shows it as P0112. Cummins INSITE and Calterm show the Cummins number, the SPN / FMI pair and the lamp together.

Fault code 154 is defined in the fault tables of the Cummins calibrations we have analysed and is one of the more commonly enabled codes, so it is a real, current code rather than a legacy number.

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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.

153 FMI 3 · P0113155 FMI 0 · P0127436 FMI 2 · P0111488 FMI 16783 FMI 101848 FMI 10 · P01112176 FMI 152964 FMI 15 · P01273385 FMI 183644 FMI 143739 FMI 174843 FMI 154853 FMI 316489 FMI 36519 FMI 47141 FMI 37142 FMI 47399 FMI 317444 FMI 217445 FMI 20

All codes grouped by SPN →

Related Cummins fault codes

149 · SPN 29 FMI 2Accelerator Pedal Position 2151 · SPN 110 FMI 0Engine Coolant Temperature152 · SPN 110 FMI 17Engine Coolant Temperature153 · SPN 105 FMI 3Engine Intake Manifold 1 Temperature155 · SPN 105 FMI 0Intake Manifold 1 Temperature156 · SPN 1131 FMI 3Intake Manifold 2 Temperature Sensor Circuit157 · SPN 1131 FMI 4Intake Manifold 2 Temperature Sensor Circuit158 · SPN 1131 FMI 0Intake Manifold 2 Temperature

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.

FMIMeaning (SAE J1939-73)
0Data valid but above normal operational range - most severe level
1Data valid but below normal operational range - most severe level
2Data erratic, intermittent or incorrect
3Voltage above normal, or shorted to high source
4Voltage below normal, or shorted to low source
5Current below normal or open circuit
6Current above normal or grounded circuit
7Mechanical system not responding or out of adjustment
8Abnormal frequency, pulse width or period
9Abnormal update rate
10Abnormal rate of change
11Root cause not known
12Bad intelligent device or component
13Out of calibration
14Special instructions
15Data valid but above normal operating range - least severe level
16Data valid but above normal operating range - moderately severe level
17Data valid but below normal operating range - least severe level
18Data valid but below normal operating range - moderately severe level
19Received network data in error
20Data drifted high
21Data drifted low
22Reserved for SAE assignment
23Reserved for SAE assignment
24Reserved for SAE assignment
25Reserved for SAE assignment
26Reserved for SAE assignment
27Reserved for SAE assignment
28Reserved for SAE assignment
29Reserved for SAE assignment
30Reserved for SAE assignment
31Condition exists

Questions about code 154

What does Cummins fault code 154 mean?

Cummins 154 is "Engine Intake Manifold 1 Temperature - Voltage Below Normal or Shorted to Low Source". It maps to SPN 105 FMI 4 and OBD code P0112. The signal wire for Engine Intake Manifold 1 Temperature 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 154 turn on?

Amber WARNING lamp: It lights the amber CHECK ENGINE (warning) lamp. The engine keeps running, but a torque or speed derate may apply depending on the calibration and on how long the fault stays active.

How do I clear or permanently delete Cummins code 154?

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 154 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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