Engine Speed / Crankshaft Sensor - Data Valid But Above Normal Operating Range
The CAT-CID190-FMI0 (Caterpillar) diesel fault code means: Engine Speed / Crankshaft Sensor - Data Valid But Above Normal Operating Range. This is a serious severity code.
- Keep driving?
- No -- stop driving
- DIY difficulty
- intermediate
- Estimated cost
- $300-$3000
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Common Symptoms
- Warning lamp
- Value above expected operating range
- Engine protect or derate
Probable Causes (Ranked by Likelihood)
- Actual measured value truly high from mechanical issue Very Likely
- Sensor reporting incorrect high reading Likely
- Overheat, overpressure, or overspeed condition Likely
Step-by-Step Diagnostic Procedure
Confirm with CAT ET and compare to mechanical gauge reading on the affected system.
If the physical system is truly high, shut down and address root cause.
If physical reading is normal, inspect wiring for shorts to voltage and replace faulty sensor.
Frequently Asked Questions
What does CAT code CID190-FMI0 mean?
CAT code CID190-FMI0 (Engine Speed / Crankshaft Sensor - Data Valid But Above Normal Operating Range) 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 0 (Data Valid But Above Normal Operating Range) 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-FMI0?
No. This fault can trigger engine protect mode, derate, or cause further damage. Park and diagnose before operating.
How much does it cost to fix CAT CID190-FMI0?
Typical repair is $300-$3000. 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.
Sources
This page is built from documented references. Verify against your own service info before repair work.