Diesel engines are known for being tough and reliable. Keeping the vehicle well maintained and serviced regularly will ensure that the truck stays in the best condition for many years. Most problems with engines are due to poor or infrequent maintenance. It is also damaging to have a diesel engine run out of fuel, so always keep the tank at least half full.
Check the fuel system. Press the fuel line reset button. If this does not solve the problem, check the glow plugs and controller. Turn the key to the "On" position (but do not start the truck) then back to "Off." Repeat this several times. This will warm up the glow plugs. If the engine starts up or attempts to start, then it is a glow plug problem.
Check the oil pump, fuel line separator and fuel injection module. All three of these components can cause starting problems. Check each component and replace it if necessary. These can all be clogged by using a high-sulfur diesel fuel. Replace or clean components and switch to a low-sulfur diesel fuel.
Diluted or low engine oil is the source of low ICP (Injection Control Pressure), which results in failure to start. The engine needs at least 400 psi for the ICP to engage the fuel injectors. Crank the engine manually and see what happens to the pressure gauge on the dash. The pressure gauge should start to increase; if it does not, then the engine may have low pressure and there may be a leak.
