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Eric, Automotive Repair Shop Manager
Category: Car
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Experience:  Automotive Repair Shop Manager, Technician/JA Mentor
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Grand Cherokee: the onboard diagnostic has a display, "Service

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the onboard diagnostic has a display, "Service 4WD System" showing. What does this mean? There is 5000km before next service due.
This is a 2008 Cherokee, 3.0L turbo diesel.

Ok, this means that there is a fault in the 4wd system, ranging from a faulty Final Drive Control Module, faulty sensor in the front differential, internal failure of the front differential, wiring harness short or open, or even low fluid level.

To know which, the control module must be scanned with full function scan tool to retreive the fault codes which tell the area of concern. At that point, further diagnostics can be performed to find root cause.

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