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Hi Leon,
Mechanic of nearly 20 years.
My first port of call would be a charge air leak in one of the rubber hoses either from the turbo to the intercooler or intercooler to induction. What general happens is they get a split. To computer knows approximately what boost pressure it should be achieving given throttle demand, engine RPM and wastegate position and if it doesn’t see a measurement within that range from your boost pressure sensor it will enter a limp mode as you correctly stated to protect the engine. This can happen more often when you have more weight in the vehicle or are towing because the boost is held on for longer as the vehicle acceleration is slower. This gives the computer enough time to evaluate the difference. Under normal driving it doesn’t mind the small discrepancies it sees and treats them as acceptable. Either that or the split isn’t big enough to leak enough charge air for the short bursts of acceleration for the computer to recognize the fault.
Hope this helps
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