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All manufacturers have their generic global On Board Diagnostics, as well as their manufacturer proprietary diagnostics. Most general and even foreign auto service shops won’t be able to access the manufacturer side of the diagnostics. Land Rovers are unique vehicles as they are very restrictive about who gets their software to diagnose their systems.
I suggest the first step is to find a Land Rover Specialty shop, or the dealer. They are likely the only ones who will have the diagnostic equipment to properly inspect, test, repair, or advise you as to the cause of the condition.
”TRANSMISSION FAULT LIMITES GEAR ONLY displayed after which the gear sticks in gear 3 and would remain there even if manual drive is selected.” Indicates that the transmission has gone into “limp” mode. This is to alert you that there is a problem and requires a visit to a repair facility very soon.
The first step in the “diagnostic process” is to interrogate the fault memory of the effected control module and retrieve the DTC (Diagnostic Trouble Code) associated with the condition.
Once the code is retrieved the effected circuit, identified by the DTC, should be tested to determine the actual cause. The conclusive test results identifying the failure would be the “diagnosis”.
Sometimes a DTC is a “hard” or permanent fault. This is a DTC identifying a failed circuit, something that is failed all the time. If you erase the code the code returns immediately as the fault is “hard” or permanent. These DTCs are typically the easiest to repair as the correct test will typically identify the fault.
At other times the DTC is “intermittent”. An intermittent DTC is one that identifies a “failing” circuit. At times it may be failed, but at others it may be functioning properly. Typically these are more difficult to diagnose as if you test the circuit when the fault is not present, the circuit may pass the test at the time.
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Jake “The Auto Doctor”