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Cummins fault code2243 · Intake Manifold 5 Temperature Circuit

Intake Manifold 5 Temperature Circuit - Voltage Below Normal or Shorted to Low Source

Fault code2243 Cummins fault code as shown in INSITE / CaltermSPN1802 · Intake Manifold 5 TemperatureFMI4 Voltage below normal, or shorted to low sourceOBD codenone (J1939 only)LampAmber WARNING lampCummins textIntake Manifold 5 Temperature Circuit - Voltage Below Normal or Shorted to Low SourceFailure modeVoltage Below Normal or Shorted to Low Source

What Cummins code 2243 means

The signal wire for Intake Manifold 5 Temperature Circuit 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 1802 FMI 4 rather than as Cummins code 2243. Cummins INSITE and Calterm show the Cummins number, the SPN / FMI pair and the lamp together.

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Cummins ECFG / E2M definitions for CM550, CM552, CM554, CM570, CM800, CM850, CM870, CM871 and more: the fault table, torque, fuelling, boost, EGR, DPF and SCR maps, ready for Calterm or WinOLS. Instant download.

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Other Cummins codes on SPN 1802 Intake Manifold 5 Temperature

4 other fault codes share this SPN; each one is a different failure mode (FMI) of the same component.

1987 FMI 16 2241 FMI 0 2242 FMI 3 2244 FMI 10

All codes grouped by SPN →

Related Cummins fault codes

2238 · SPN 1359 FMI 3Engine Cylinder 8 (B4) Knock Sensor Circuit 2239 · SPN 1360 FMI 3Engine Cylinder 9 (A5) Knock Sensor Circuit 2241 · SPN 1802 FMI 0Intake Manifold 5 Temperature 2242 · SPN 1802 FMI 3Intake Manifold 5 Temperature Circuit 2244 · SPN 1802 FMI 10Intake Manifold 5 Temperature 2245 · SPN 1803 FMI 0Intake Manifold 6 Temperature 2246 · SPN 1803 FMI 3Intake Manifold 6 Temperature Circuit 2247 · SPN 1803 FMI 4Intake Manifold 6 Temperature Circuit

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 2243

What does Cummins fault code 2243 mean?

Cummins 2243 is "Intake Manifold 5 Temperature Circuit - Voltage Below Normal or Shorted to Low Source". It maps to SPN 1802 FMI 4. The signal wire for Intake Manifold 5 Temperature Circuit 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 2243 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 2243?

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 2243 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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