My scenario is whilst towing a caravan around 3T at 100ks per hour for roughly 1.5 to 2 hrs if I slow down to go through a roundabout or like more often than not when I begin to accelerate out the other side the engine drops into limp mode. The code is P0046 relating to turbocharger supercharger boost control solenoid A . I have had the vehicle to Toyota three times and various deisel specialists with no success at rectifying the problem. It is an intermittent problem and they are unable to reproduce the limp mode trigger. The vehicle runs beautifully when not towing although it has happened twice without load but once the mode has been triggered ( I should mention I have a scanner to reset the code and this gets us back on the road ) it happens at random but often times. The latest deisel specialist determined that the left turbo was faulty so this was replaced but the problem still exists so I am wondering perhaps the issue might be a mechanical or fuel issue was wondering if anyone has an idea what might be the cause cheers
