ChryslerPete

Hi guys, I have a Chrysler Grand Voyager 2.8 Diesel 2006. The engine warning light comes on when going up a hill and the revs get to about 2.5 for several seconds, or on the motorway and the revs are at 2.5 for several seconds. Now when the engine warning light comes on, the power is still ok and no issues with the engine, speed, no limp mode etc. Then after 1, 2 days the engine light goes off and stays off all the time (for weeks) unless I take the car to 2.5 on the revs again for several seconds, then it comes on straight away. Also what I have just noticed as well is, when it is warm/hot outside (sunny day) the engine light comes on straight away once the car starts and is stationary or just driving steady/slow. When I had the car serviced and had a 63 point check done, nothing was showing for the engine light issue. Does anyone have any idea what the issue is with the engine light coming on when getting to about 2.5 revs? Is it like some pipe or something that when there's enough pressure a pipe or something may have a split in it and the pressure opens it up and then this causes the engine warning light to come on? I have done 2-3 days travelling many times doing over 1000 miles with the engine warning light on without any issues to driving, speed etc, but I just feel more comfortable having no engine warning light coming on. Thanks