20 Most Recent 2008 Chevrolet Silverado 2500HD 2WD - Page 8 Questions & Answers

Is the code PO560 for your silverado or a kia sportage?

Have you checked the brake switch located on the brake pedal? I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

jack up a wheel and turn the drive shaft if the wheel can be held steady then it is free wheeling repeat the process for the other wheel.

try rebuilding the carb nd or tune up on engine

Under normal driving the fluid never needs to be changed except if it is being serviced for a problem. It should use Dexron VI fluid.

Look for an obstruction in one of the fuel fill lines. Either the liquid line or the vapor fill line, has an obstruction. There may be a kink in one of the lines. There may be something inside that you didn't put there but is there. Look at the filler lines and how they are routed. They should travel downward, to the fuel tank. Has there been any work down recently, in that area?

The Front Axle Actuator is probably your problem. I have replaced my Actuator TWICE in the last 7 years.... The Reason for the Service 4WD was the Failed Attempt. If you are able to test the Power going to the Actuator and there is none, then you have one of 3 switches that went bad but Chevrolet/GM is known for having the Defective Actuators. Aftermarket Actuators are available.

What year is the truck? The first two things to consider checking would be the thermostat and the fan (for the radiator). Would you give more information/details. What tests have you all ready run? What repairs (if any) were performed before this issue. What is the condition of the antifreeze? How does the radiator cap look? What is the temperature of the antifreeze when it overheats? Can you see the antifreeze circulate after the thermostat opens (it could be caused by a faulty water pump, bad propeller)? If i can be of anymore help, let me know. Good luck.

under hood drivers side.

I take it that your engine is a diesel (glo-plugs) in which case the pumping of the accelerator is just good exercise for your leg but does nothing for the engine as it does not have an accelerator pump. faulty glo plugs will only make for hard starting on cold mornings so that will be out also. So the next ting that will give some idea as to the problem will be to have the fault codes read and that will show up the area and sensors that are causing your faults.

Top off ATF and re-test