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My wife and I just bought a 2014 Overland Diesel, she noticed that at low speeds there is a clicking noise. Is there normal? We don't even have 500 miles on the Jeep yet. When I'm driving the jeep I noticed that the clicking noise goes away when I let my foot off the gas. Its a very low clicking noise but even with my hearing loss I can hear it.
 

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Depends on the click. Diesels rattle because they operate by detonating fuel which is another way to say "explode the fuel".

The injectors also make a clicking buzz sound that can be heard at low rpm when everything else is quiet.
 

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I read in the manual the DEF pump may run after the engine is shut off. Could it be the DEF system operating?
There is nothing to doubt. As the manual states the DEF pump does run for about 10-15 seconds after the engine is turned off. It has a squeaky noise coming from the back of the vehicle. During this operation the pump purges the DEF line and doser.
 

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Is it more of a "ping"?

If so I believe it is the exhaust at the rear. We are currently having that problem.
 

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Folks, it's a diesel. It has a rattle from detonation and clicks from the injector solenoids that are inherent to the operation. The injector pump also can be heard with a trained ear.

It is very difficult, with so many inherent sounds, to diagnose an engine noise through describing it in a forum. You might try test driving another Jeep GC Diesel for comparison.

Once you get used to the new normal sounds, then you can trust your ears!
 

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Folks, it's a diesel. It has a rattle from detonation and clicks from the injector solenoids that are inherent to the operation. The injector pump also can be heard with a trained ear.

It is very difficult, with so many inherent sounds, to diagnose an engine noise through describing it in a forum. You might try test driving another Jeep GC Diesel for comparison.

Once you get used to the new normal sounds, then you can trust your ears!
Not my ears, I'll just trust yours.
 

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We have a 14 GC and I notice it too. It's a chirp at low speeds that increases or decreases with throttle. I can only hear it when my window is down.
 

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We have a 14 GC and I notice it too. It's a chirp at low speeds that increases or decreases with throttle. I can only hear it when my window is down.
I think the Bosch injector pump makes a chirping sound. It sounds like a rapid metallic rattle to me. Its very faint but there. I don't here it at idle but under higher torque low rpm where fuel pressure rises, it's audible. It gets masked by other sounds at higher rpm. Its either the pump or injectors.
 
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