Hi - my Ducato based motorhome had a 'check engine warning' message together with the orange engine symbol last week but it has now disappeared.

We were in Europe and it was 37C (in the shade). My van was parked in a car park in direct sunlight all day and was 45C inside when we had to drive it. After 45mins of driving (a/c on full power), sitting at approx 50-60mph, the warning light came on for the first time and remained on for the remainder of that journey (20mins).
The following morning it was still prety hot (30C) and the light was still on for an hour or so. We stopped at a supermarket and the warning light disappeared (by now it was 24C) and for the 2hour journey home it was not showing. I started the van yesterday and still no warning light.

I plugged in a code reader and it came up with a logged fault code of P0482 Fan 3 control circuit. Is it possible that this was caused by the heat (the van's temp gauge never moved from the middle of the gauge) and it has 'reset' itself and that the code is just historical, or is it more likely that the fault still exists and the warning light will reappear sometime?

Thanks

If the warning lamp has extinguished it was likely a temporary fault. If a fault is logged, but doesn't reappear after several drive cycles, the instrument warning will be cleared. Some (better) code readers will report these codes as pending or historic.


If the fault doesn't reappear, it will eventually be cleared from memory completely.


A better course of action is to clear the code with the reader, then rescan the system. If the rescan is clear, you know you are going forward with a clean sheet and if the same code subsequently reappears, you can be sure it was in response to a further instance of the fault rather than the previous activation still being in memory.

Thanks, I will clear the fault and see what happens next.

My reader is a £20 amazon special, so prety basic...