Engine Speed / Crankshaft Sensor - Data Erratic, Intermittent, or Incorrect
The CAT-CID190-FMI2 (Caterpillar) diesel fault code means: Engine Speed / Crankshaft Sensor - Data Erratic, Intermittent, or Incorrect. This is a serious severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- intermediate
- Estimated cost
- $200-$800
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View pilot availability →What Are the Symptoms of CAT-CID190-FMI2?
- Intermittent Check Engine Light
- Erratic or fluctuating signal on CAT ET
- Possible stumble or momentary power loss
What Causes CAT-CID190-FMI2? (Most Likely First)
- Intermittent wiring fault from chafe or loose pin Very Likely
- Failing sensor producing noise Likely
- EMI or ground noise or bad ECM ground Possible
Can I Still Drive with CAT-CID190-FMI2?
Short distances only. CAT-CID190-FMI2 is rated serious severity. Keep trips short and get it diagnosed soon rather than waiting for symptoms to worsen.
Frequently Asked Questions
What does CAT code CID190-FMI2 mean?
CAT code CID190-FMI2 (Engine Speed / Crankshaft Sensor - Data Erratic, Intermittent, or Incorrect) is a serious-severity fault on Caterpillar on-highway diesel engines. CID 190 is the Engine Speed / Crankshaft Sensor, measuring primary crank speed signal. FMI 2 (Data Erratic, Intermittent, or Incorrect) indicates the specific fault mode. Use CAT ET to confirm before replacing parts. Diagnose with CAT ET (Electronic Technician) software.
Can I drive my truck with CAT code CID190-FMI2?
Short distances may be acceptable, but running long with this fault risks progressive damage or forced derate. Address promptly.
How much does it cost to fix CAT CID190-FMI2?
Typical repair is $200-$800. Sensor / wiring fixes fall at the low end; injector, HEUI pump, turbo, or aftertreatment work falls at the high end. CAT dealer labor often requires CAT ET for calibration and parameter programming.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose CAT-CID190-FMI2?
Wiggle-test the harness and connector while watching live data on CAT ET for dropouts.
Back-probe the signal pin and measure during operation; erratic readings confirm the circuit or sensor.
Inspect connector pin tension and replace the sensor if harness checks good.
Sources 1
This page is built from documented references. Verify against your own service info before repair work.
- SAE J1939-73Application Layer: Diagnostics (defines the SPN/FMI fault-identifier framework)
Which Vehicles Commonly Get CAT-CID190-FMI2?
- Freightliner Classic XL with CAT C15
- Peterbilt 335 with CAT C7
- Peterbilt 386 with CAT C15
- Kenworth T800 with CAT C15
- Western Star 5900 with CAT C15
- Peterbilt 389 with CAT C15
- Peterbilt 387 with CAT C15
- Kenworth T470 with CAT C9
- Kenworth T800 with CAT C13
- Peterbilt 386 with CAT C13
- Thomas / Bluebird school bus with CAT C7
- Peterbilt 387 with CAT C13
- Peterbilt 340 with CAT C9
- Peterbilt 379 with CAT C15
- Kenworth T370 with CAT C7
- Kenworth T660 with CAT C13
- International 9400i with CAT C15
- Kenworth W900 with CAT C15
- Freightliner Columbia with CAT C13
- International 9200i with CAT C13
- International 4300 with CAT C7
- Western Star 4900 with CAT C15
- Freightliner M2 106 with CAT C7
- IC Bus shuttle with CAT C7
- International 9200i with CAT C15
- Kenworth T2000 with CAT C15
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