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Fast Idle Wont Work has UF3 RPO code
This truck will not idle up on the fast idle. **This is not the same as elevated idle when cold** the parameters as per GM up fitter bulletin require the RPO code UF3, Cruise control switch ON, park brake ON, Brake Pedal OFF, Cruise button SET and it should id... Login to read more. 
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| VIN | 1GC1KXC84C |
| Engine | 6.6 L |
| Trans | 6-speed Automatic (Electronic) |
Vehicle Data
2012 Chevrolet Silverado 2500 HD LT 6.6L
| VIN | 1GC1KXC84C |
| Engine | 6.6 L |
| Trans | 6-speed Automatic (Electronic) |
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