Engine Malfunction mean you have problem in one of systemes. You must read the fault codes from the dashboard, by pressing diagnosis keys
I searched "engine malfunction scania p300" & got some hits but I don't know enough to go further, but at least it's a start.
SOURCE: how can i soft the problem about engine jerking scania truck p380
P0380 Glow Plug/Heater Circuit A -Circuit Malfunction
P0381 Glow Plug/Heater Indicator/Warning Lamp Circuit
This is the code i think your seeing so you need some new heater plugs or maybe a fuse or a timer relay but as this is a direct injection scania diesel then it will start anyway unless you in ice road truckers land ,Now iam unsure about the year of this vehicle but iam assuming its a newer version than i worked on 30+ years ago so its common rail injection and all computer controlled which means its not a mechanic like old fleet fitter here but a Bosch diesel specialist to connect up to the computer and see whats what ,now if it had the old bosch injector pump and it was 40 yrs old then i soon beat it into submission for you but this electronic controlled although i know whats its doing and how it does it i cannot even think about trying to repair it without the 10,000 euros worth of fancy electronic gear and the newer ones have to be connected to the internet back to the factory owing to the encrypted software used to prevent the chinese from copying it and selling it over the internet .
P0380 Glow Plug/Heater Circuit A -Circuit Malfunction
P0381 Glow Plug/Heater Indicator/Warning Lamp Circuit
This is the code i think your seeing so you need some new heater plugs or maybe a fuse or a timer relay but as this is a direct injection scania diesel then it will start anyway unless you in ice road truckers land ,Now iam unsure about the year of this vehicle but iam assuming its a newer version than i worked on 30+ years ago so its common rail injection and all computer controlled which means its not a mechanic like old fleet fitter here but a Bosch diesel specialist to connect up to the computer and see whats what ,now if it had the old bosch injector pump and it was 40 yrs old then i soon beat it into submission for you but this electronic controlled although i know whats its doing and how it does it i cannot even think about trying to repair it without the 10,000 euros worth of fancy electronic gear and the newer ones have to be connected to the internet back to the factory owing to the encrypted software used to prevent the chinese from copying it and selling it over the internet .
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