2016 Volvo 780 can not start regen.

NOTHING is "wrong"



New trucks do not do parked regen unless you have a problem(or dealer forced)..... Even extended idling will only trip a mode to warm the SCR system to prevent build-up.

These new trucks are a totally different animal than the old ones.

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Not sure if anyone had an answer to this but I would like to give it a shot.

The code is reference to the fuel control module unit that supplies air and fuel to the 7th injector. p24f600 and p24f700 are codes that I have dealt with twice in the past month. They both lead us back to that module, we have two different types of those control modules in our fleet.

They both have a fuel supply and Air Supply (its called the AHI system) Aftertreatment Hydrocarbon Injector. There is also a fuel pressure sensor in the housing of the module. These are usually found somewhere close to the Fuel Filter Housing, because it is usually the source of fuel for the AHI. I have had the air inlet on the module itself to go bad twice now. You do have to replace the entire module.

I would also recommend that you remove the 7th injector and clean the build up off of it. We use brake cleaner and make sure to spray through the top plum thru the injector. If your not getting the air to push the fuel over to the injector the carbon/exhaust builds up on the nozzle of the injector - so if you replace the module you will want to clean that injector. It will eventually open up but probably not in time for you to do a needed Regen. Same thing with your Dosage valve if your running DEF, if it has been partially Regen but not completely a good burn - the dosage valve has build up as well - and again Brake Cleaner.

And Lastly - Please do not allow your truck to sit and idle for 1-2 days - The sulfuric acid build up could possible eat the O rings out of your Injectors, and I wont list all the other possibilities. Not to mention you build up twice the soot levels by doing so

 

OP didn't have a problem, he's just unfamiliar with the newer emissions system how they work......

if it doesn't need regeneration it won't let you do it.....

Don't worry about "sulfuric acic" on your injectors, in the United States ... we run ultra low sulfur diesel it's a non-issue.
High sulfur fuels are toxic to the emissions system.. don't use them.