What Causes On The Turbocharger Overheat?

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Causes of Overheating:

Hot shut down. DPF issues, such as regeneration, resulting in increased exhaust gas pressure and temperatures which leads to overheating of the turbine side of the turbocharger.
Remapping, chipping or over-fueling.

Overheating is a term used to describe components that have been subjected to abnormally high exhaust temperature or insufficient cooling.

Discolouration at the hot end of the turbine wheel, spreading along journal bearing area.
“Heat soak” from the turbine side of the turbocharger through to the compressor side, causing discolouration to the turbine shaft and bearing housing.
Discolouration of internal components including thrust washer and flinger; occasionally without evidence of wear.
Collapse (loss of tension) to turbine end piston ring.
Carbon build up in the oil feeds and piston ring area.
Abnormal, excess wear to turbine end piston ring and groove.
Turbine blades appearance being uniformly curved downwards.
Small sections or edges of the turbine blades being fractured/partial loss of blades.

Check the DPF is in good working condition.
Ensure there are no leaks in the cooling lines.
Give the turbocharger time to cool, particularly after long journeys or harsh driving conditions.

What to Do When Your Car Overheats