D13 warmhold not working, jake not operating

so this happened this morning.


D13 with 510k miles. One active fault- spn173 fmi2. Probably bad egt sensor on dpf. Replacing all three this afternoon.


I knew the truck should be kicked up a few rpm by pushing the cruise button up when parked and idling. Clean idle message comes on after a while most times but not all (I mostly use my apu, on really cold nights I'll keep the truck running just to cya)

Last week it started working only sporadically and now not at all.


This morning exauhst brake is not working at all. It was functioning fine not even 12 hours ago.


Doubting the egt temp sensors and this are related but I'd love to hear some thoughts? Other than here we go again.


Update- Okay so now exauhst brake is operating again. Warmhold is still awol. Just as a side note, engine is running fine. Turbo is responding to accelerator just as normal, power is normal. No other codes than egt sensor high voltage/anomalous signal. Truck started a passive regen on my trip to grab groceries (live in the semi) 20 mile drive to the store. I love chasing this #### /s

 

Appears warmhold is functioning again, jake is functioning. This is post egt sensor replacement (a/b/c figured I'm doing one I'll do em all.)


Since there seems to be no one that knows about this I'll update it in a week or two once the warmhold and jake are operational consistently. I still don't see how egt sensor would kill warmhold and jake but it is a Volvo and therefore- a gigantic ####ing mystery.

 

Exauhst pressure is fine, though I'm nearly certain there's a leak on the egr cooler ( 1/8 gallon coolant loss/week saw mystery fluid percolating on bad braze on weld with egr return crossover tube) outside of that I think it was he egt sensor. Only thing that's had work done recently.

Clean idle message still doesn't come on every time but basically only when I sit for a long time and the eats is sitting over 1/3'd full on soot.


Warmhold is up 100% and no issues with jake.

Gotta love owning a Volvo.

 

Yeah working on it, haven't had a chance to confirm it's the egr cooler and not the head gasket yet. Not throwing $1,300 at something that might not even be the source. But it probably is.

 

Will do. Like I said crossover tube from the egr return to intake had a bad weld on the temp sensor mount flange and it was bubbling some brown #### out. Granted this was on a cold start and might've been condensation but at that pressure I doubt that much water would've been around when the engine was hitting around 100 on the oil. I'll try to grab a pic off the video I took of it.


Here's the pic, you can see that tube weld was failing for a few days before I caught it.

Replaced sensor and tube. No more than usual soot build up. Did the delta p sensor on egr the week before and it was normal soot build too. Thinking of popping off the intake manifold and checking the splinters on that if the egr is leaking.

The kit to do an egr pressure test is $880 (and that's fleet price from Volvo direct) so I'm still trying to work something else up. This weekend I'm gonna pull the egr cooler return tubes off and inspect it for signs of coolant leak until I can figure out a pressure tester that isn't $1k. Thinking of getting a couple pieces of steel machined to shape with a pressure bipple on one end.

 

Egr cooler confirmed NOT leaking. Waiting on oil test to come back for head gasket.

Might be the carrier comfort pro that has 12,000 hours on it connected to main engine coolant. Praying and hoping that's the case. That sucker can eat all the coolant it wants, I just don't want the head job bill.

 

Oil sample results come back with .05% water on oil. Listed as normal. Head gasket confirmed not leaking, egr visually inspected and pressure tested.

In comes the carrier comfort pro apu connected to main engine coolant loop with 12,000 hours. It's either chewing coolant or I have a bunk heater core leak possibly sub floor valve connector. This is more of a job for summer when it's not snowing up the ### and 14 degrees outside.

Coolant consumption hasn't increased or decreased (I run the apu consistently) and warmhold occasionally refuses to start especially when the engine is ice cold in the mornings. Makes sense but it gives me occasional trouble and refuses to kick on after operating for hours at a time occasionally.