Noise
Diesel engines can create noises that may seem as a
concern. The nature of a diesel engine is
compression ignition where compressed air and fuel
are mixed and ignited. Weather, Barometric
Pressure, Altitude, and Temperature will affect
how fuel is ignited in the engine. Engine’s will
sound different from day to day or previous model
years. Clicking, ticking, or light
knocking is normal
and will change from day to day and as the engine
breaks in, this is normal. Clicking sound from under
the hood shortly after vehicle shutdown is normal as
actuators such as the EGR valve are cycled. Diesel
equipped vehicles also have an exhaust after
treatment system to reduce emissions utilizing a
DPF (addressed in Odor category) and an Selective
Reduction Catalyst (SCR). The SCR reduces NOx
using the Diesel Exhaust Fluid (DEF) system.
DEF is injected directly into the SCR through a
dosing module. This process will create a
clicking sound and at times, will make noise
even with the vehicle shut off. This is normal as
the DEF dosing module is purging DEF. If at any
time the check engine light is on, please visit an
authorized dealer.
Fluid Leaks
Diesel engines and new vehicles use assembly /
anti-corrosive lube to assure the correct assem-
bly torque on fasteners and prevent corrosion.
You may notice areas that may appear damp as
a fluid leak but is typically residual assembly
lube, this is normal. Dealers make every effort
to remove residual fluids during vehicle pre-
inspection. If at any time fluid is found dripping
on the ground, please visit an authorized
dealer. If at any time the check engine light is
on, please visit an authorized dealer.
Engine Idle
Diesel engines are equipped with variable idle
speed. Periodically your engine can idle as high
as 1100 rpm while in Park (P). This is normal
for engine warm up and emissions. During this
high idle mode, the engine will sound different,
this is normal. The engine will return to low idle
if the brake or clutch pedal are depressed. We
recommend not pressing either pedal unless
you are ready to drive the vehicle as this will
interrupt warm up or emissions strategy. If at
any time the check engine light is on, please
visit an authorized dealer.
Drivability
Diesel engines are controlled by a PCM (Pow-
ertrain Control Module). With state of the art
technology and emissions regulations, vehicles
may perform differently from one model year to
another.
Drivability can also be affected by the following:
• After-treatment regeneration
• Two footed driving (if brake pedal and accel-
erator are pressed at the same time, you will
notice a delay in power).
• Temperature
• Weather
• Wind
• Load
• Altitude
• Gear Ratio
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