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El Sobrante, CA
Check all of your grounds for good tight connections. If they are all good, then take to a shop for proper electrical diagnosis.
Aside from the timing chain tensioner, are you sure that the balance shafts and chain were installed correctly and timed correctly? Did the camshaft or crankshaft position sensors(s) get broken by chance? Tear down and re-inspect and line everything back up again. Pray you didn't do internal damage if anything is off.
P0171 is a lean code and P0172 is a rich code. It could be the MAF sensor, but it sounds like it is air leaks. Grab a can of carb cleaner and spray along the edges of the intake manifold. See if the idle fluxuates or stumbles. Also listen to the engine when the vehicle starts up cold and see if you hear any exhaust leaks. An exhaust leak before the O2 sensor will cause problems as well. Try switching sides with the O2 sensors before the cat convertors and see if code(s) P0174 or P0175 set. You may just have a bad O2 sensor. If the code changes whent he sensor is moved, replace the sensor.
Have vehicle scanned for codes. The low coolant light may not be related to the service engine light at all. Try taking a rubber mallet or hammer and tapping on the overflow tank (not too hard) around the sensor and see if it will unstick itself.
Maybe it is for your fog lamps (or what would be the fog lamps if that option isn't on the vehicle. Give me the last 8 of the vin and I can research it for you.
Does the vehicle run rough? Does the check engine light flash while the car is running? There are many "Possible Causes" of a P0300 Random Misfire code. I would reccommend taking it to a shop if you don't have access to some basic test equipment such as a scan tool (not a code scanner), DVOM, Fuel Pressure Guage, Ignition Analyzer, Injector Tester, etc. How did the old plugs look when you removed them? Fouling? Deposits? Wet? If they were fouled or had deposits, what color was the debris?
The newer GM diesel trucks do have a Diesel Exhaust Fluid system and a 5 gallon storage tank that you have to fill every 7500 miles or so. The DEF system injects the fluid downstream in the exhaust and it is used as a soot and emissions reduction agent in the DPF (equivalent to a catalytic convertor on a gasoline system). Your truck, however, does not have this system. They did not start that system until roughly 2010. If you have questions about your truck, feel free to email me at ChevyASE@aol.com, as I am the Diesel Tech at our dealership and will be happy to answer your questions regarding your GM diesel.
I am guessing that you are talking about a "No Crank" condition. If this is the case, you need to look carefully under the hood and see if the belt broke and of the wires or cables when it broke. If all the wiring under hood looks good, use a test light and see if you are getting signal to the starter "S" terminal (the purple wire) when you turn the key to the Crank position. If you are getting signal and it won't crank, see if you hear the starter engage (click). You could have a number of issues. Did the truck shut off when the belt broke? Did the Battery indicator come on when the belt broke? If you have signal to the starter and it isn't cranking, first try hitting it (not too hard) with a hammer while having someone try cranking it. If it still won't crank, try removing the belt and cranking it. If it still won't crank, then you have other issues. Please post the results of your tests here for further help.
Sometimes cleaning the solenoids doesn't always fix the problem. We replace a lot of them, and the actuators on the cams as well. Common problem. Is the Check Engine Light flashing when it is running rough? Have you scanned the codes again to see if you have misfire codes (P0300, P0301-P0304)? You may have solved the P0010 and P0011 problem and simply have misfires. If the 0010 and 0011 keep setting, take it to a shop. Not a DIY repair.
I don't get whether you mean the Reverse Lights or the Tail/T-Sig/Stop Lamps, but either way, your fuse box is the UBEC (Underhood Bussed Electrical Center). It will be on the left front fender under the hood. Just use a test light hooked to ground and check all the light fuses with the key on, engine off. If they all test good, then you may have another issue. Please post your results (and which lights you are asking about exactly) here if you need further help. There is no fuse block under the driver seat.