Case IH Error Code ENG 115 — What It Means and How to Fix It

Applies to: Magnum Series (235-380), Puma Series (115-240), Axial-Flow Combines (5130-9240), Steiger/Quadtrac Series

STOP — Engine may not start or may shut down abruptly

Try restarting. If the engine cranks but won't fire, check the speed sensor connector on the front of the engine for looseness or corrosion.

CIH ENG 115Case IHManually verified

Engine Speed Sensor (or Cam Sensor) Failed

The engine speed sensor (8.3/9L engines) or cam sensor (15L engines) has failed or is not providing a signal. Without knowing engine speed, the ECU cannot control fuel injection. The engine may crank but not start, run rough and shut down, or not crank at all.

Repair difficulty

DIY — Basic tools

Repair time

20 min

Dealer cost

$200-500

What to check first

1
Try to restart — if the engine cranks but won't fire, this code is likely the cause
2
Locate the engine speed sensor (front of engine, near crankshaft pulley) and check the connector — disconnect, inspect, reconnect firmly
3
Check sensor wiring for chafing, heat damage, or rodent damage along its length

Likely causes

1
Failed sensor (internal open or short circuit)— Possible
DIY
Test with multimeter — typically 200-900 ohms. 0 or infinite confirms failure.
2
Loose or corroded connector— Most likely
DIY
Vibration loosens these connectors over time. Often the fix is simply reconnecting.
3
Wiring damage (chafing on engine block, heat damage, rodents)— Possible
DIY
Trace the wire from sensor to ECU connector.
4
Sensor air gap too large— Less common
DIY
Gap should be 0.5-1.5mm. If the sensor has backed out of its mounting, the gap may be too large.

Parts needed

Engine speed sensor (8.3/9L engine)
OEM: 4326596 / 3971994
$80
Varies by engine variant — CNH, Cummins, FPT versions use different sensors.
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Tools needed

10mm or 13mm socket (for sensor bolt)
Multimeter (for resistance check)
Feeler gauge (for air gap check)

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Pro tip

This sensor is cheap and easy to replace. If you're heading into harvest, carry a spare in the toolbox. A $80 sensor can prevent thousands of dollars in lost harvest time.