What is CAT Code 2426-9(2) & How to Solve It?

What is CAT Code 2426-9(2):

This code relates to a Speed Sensor fault on Caterpillar machines — specifically, a signal abnormality or sensor not reading correctly.

It may affect engine RPM, transmission input/output speeds, or PTO behavior.

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Why This Happens

• Sensor wiring damaged or loose.
• Magnetic sensor tip contaminated with metal debris.
• Cracked or failing sensor housing.
• Improper gap to tone wheel or gear.

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How to Fix It

1. Clean the sensor and inspect tone ring.
2. Adjust sensor gap to OEM spec.
3. Replace sensor if signal remains erratic.
4. Check wiring for shorts or open circuits.
5. Clear the code and test under load.

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How to Avoid It Before It Happens

1. Clean magnetic sensors during every PM.
2. Avoid mounting sensors near high-vibration components.
3. Track speed data to catch early faults.