My. Carbon. Mono. Oxide. Deter. Is. Making. Beep .how. To. Stop. This.

Doesn't have EGR valve . How many miles on the truck ?
What Causes High NO (NOx)? Nitrogen Oxide or NO is created when an engine's combustion chamber temperature reaches over 2500F. Vehicle manufacturers have designed several systems, which when working properly, lower nitric oxide emissions. Below are common failures which may cause your car, truck, van, suv, or motorhome to produce high high nitric oxide. 1. Lean Fuel Mixture - Lean fuel mixtures cause high NOx. A lean fuel mixture exists when less fuel then required is delivered to the combustion chambers or when more air then necessary is added to the fuel. In either case the lack of gasoline needed to cool the combustion chambers down is not present. Combustion temperatures increase causing high nitric oxide emissions. A lean fuel condition may be due to a vacuum leak/s and/or defective fuel control components, such as the Air Flow Meter, Engine Coolant Temperature Sensor, and O2 sensors. Read about Oxygen Sensor.
2. Defective EGR System- The Exhaust Gas Recirculation system is designed to reduce NO. The EGR system consists of an EGR valve, EGR pressure sensor, vacuum hoses, and one or more vacuum switching valves or solenoids. Later model vehicles may be equipped with electronically controlled EGR valves, which do not require vacuum lines or switching solenoids. Electronic EGR systems will have these components built in.
The EGR system's job is to re-route a small amount of exhaust gas back into the intake manifold to help reduce combustion chamber temperatures. As mentioned above NOx is created when combustion chamber temperatures reach above 2500F. By recirculating exhaust gas back into the intake, a small amount of the air/fuel mixture is replaced with inert gas, reducing combustion temperatures. Read about EGR System.
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Related Links:

• Failed High HC Emissions
• Failed High CO Emissions
• Failed High NO Emissions

3. Defective Catalytic Converter (CAT) Some vehicle manufactures have designed their cars to operate without EGR valves. Non-EGR equipped vehicles rely heavily on the Catalytic Converter to assist in the reduction of NO. These vehicles have tendencies to develop CAT problems sooner then those which are equipped. If you own a non-EGR equipped vehicle, and have failed the emissions test for high NOx, pay close attention to the Catalytic Converter. Read about Catalytic Converter
4. High Engine Mileage - Over an engine's lifetime, carbon build-up develops in the engine's combustion chambers. The more miles on your engine, the more carbon build-up on the pistons, cylinder heads and valves. Carbon build-up decreases the available space for the air/fuel mixture to combust, and causes higher cylinder compression. High compression results in high temperatures and high NOx. Keep in mind this problem is usually seen in vehicles with over 150,000 miles which have been poorly maintained. The solution to this problem is called De-Carbonizing. It usually costs around two labor hours at a smog check repair station. It will remove a good amount of carbon out of an engine. This will increase combustion space, lower compression and lower NOx.
5. Engine Overheating - Inadequate engine cooling can will high NOx. If your vehicle's cooling system is not working efficiently, (i.e. bad radiator, thermostat, hoses) high NOx will be created. Remember high NOx nitric oxide is created when an engine's combustion chamber temperatures reach over 2500F. You will want to make sure your vehicle's cooling system is working properly, and your vehicle's temperature gauge is always indicating normal.

You can pull the fuel pump fuse or relay, but that is a pain to do when you want to leave/stop every time. I would consider a club lock as well.

have car checked for a plugged catalytic converter by a reputable technician. A clogged catalytic converter results in a loss of power. The catalytic converter is made of an aluminum oxide honeycomb coated with platinum and palladium. These components react to remove CO and HC's from the exhaust stream. A two-way catalytic converter works by oxidizing CO (carbon monoxide) and HC (hydrocarbons "unburned fuel") to CO2 (carbon dioxide) and water. A three-way catalytic converter also removes NOx (oxides of nitrogen) from the exhaust. NOx is formed at high cylinder temperatures. The EGR system is responsible for inhibiting NOx. Signs of clogged bad catalytic converter

Sounds like your throttle body needs cleaned out, there is a small hole (orfice) inside above the butterfly topside of the throttle body ,that gets filled with varnish,carbon deposits, take off the t.b. and clean with throttle body cleaner, buy it at auto parts store, spray can.

Here is the best solution to reduce fuel consumption and make your car fuel efficient, i have invented an Electronic Fuel Enhancer, this device can be fixed with MAP sencor and manualy adjust the fuel , Emission must be at CO ( carbon mono oxide): 0.00 %, Hydro carbon: 100 ppm or less, CO2 ( carbon dioxide) 14/15 % , if CO level goes beyond 0.5 up to 5 % thus device can reduce it up to 0.00 % , this means your car is fuel efficient now,
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Holes in exaust, or manafold dounut connester to you tailpipe is ***** out. really need to take to a muffler shop and have this looked at, Carbon oxide and be very dangerous. Good luck to you.

Change the brake pads/rear shoes and rotors and drums inspected/replaced. Sometimes Glazing of the rotors and drums will cause this--the parts have experienced an overheat condition causing the carbon atoms to rise to the surface and rapidly cool to keep the carbon at the surface thus making the rotors or drums very hard at the surface and lessen your stopping ability.

I would start there.

The most likely cause of this is a faulty exhuast recirculation system.It is used to cool the combustion process preventing the formation of nitrous oxide emissions. The main building block of acidic rain.Use your emission diagram and locate the EGR valve.You will need specialized equipment to check it. Other than taking it off and checking for blocked passages from carbon build up there is little you can do yourself.

high hydrocarbons indicates head gasket(1 or both) leaking , carbon monoxide is a worn out catylitic convertor which both could lead to the oxy sensor getting a false reading