Detroit 60 series regen problem

Hello everyone, I am new here and was wondering if you could help me out with a problem I'm having with my truck.

I just bought this truck last month and it has been nothing, but problems. The truck is a 2008 Freightliner Colombia with a Detroit 60 series with 630k miles.

The problem I am having with the truck is:
1. wont perform auto regen.
2: will not finish a park regen.

I took the truck to a well known independent Detroit mechanic which was referred by couple of drivers in the area.

After diagnosis there was a code which he didn't tell me but what i read on his computer was Doser fuel supply abnormal. then he told me that he needed to change the Doser and do a hard regen and it will be good to go.

After completing the repair I drove for approximately 350 mile and the check CEL comes on and another 20 mile the regen lite comes on.after driving for 50 min highway speed the regen light starts flashing and i pulled over and performed a park regen.The regen took 25min and the CEL didn't go away.

After contacting the mechanic he offered to check out the truck once again so he can take a look at it. After I took it to him it said the same fault doser fuel supply abnormal and he said its the aluminum block which is the metering unit and DPF filter needs cleaning. He changed the metering unit and send out the DPF filter to get cleaned and put the truck back together and a hard regen,he said that I wont have any more problems.
After picking up the truck, today same thing happen. I tried to pull out fault codes from the dashboard and the codes are ECU128, SID 154, FAIL01. I don't know what to do anymore. I would really appreciate your help.

Thank You,
Chris

 

Thank you for the reply
the whole Doser Block Assembly is brand new from the dealer which comes assembled with all the sensors.

 

Hello Shaggy76

When i do a parked regen it run for around 10 to 25 min and kicks out and the regen light still flashes.

My mechanic does us the Detroit diagnostic link but i dont know if he looks at the pre, catalyst,and outlet temps. but when he does a forced regen it does complete.

I am going back tomorrow morning and will have him look at that and the egr valve.I well let you know tomorrow.

 

Got a update but not a good one.

took the truck in and he connected the Detroit Diagnostic Link and the two faults were
soot level high and doser fuel supply abnormal.

so he tried to do a force regen and it didn't complete,It kicked it out in about 25min. While the regen was running i asked if he was looking at pre, catalyst,and outlet temps and the egr being closed and he said they are all normal.

the reason why it kicked out of regen was the dozer fuel supply abnormal.

after a few hours of diagnosis i dont know how he came to a conclusion that the turbo actuator was bad and that was the problem. He then replace it and did the regen again and it was still the same.

After spending my whole day their i was so pissed at him and told him that you cant be changing parts left and right and took the truck and left.

on the way from his shop i saw a freighliner dealer and drove straight to service department and asked them if they had time to look at my truck,they took it in and told me they need 2 hour labor to do a diagnostic which i agreed and left the truck their. After coming home i received a call from them and they are saying that they need an additional 2 hours to diagnose because when they tried to do a regen it kicked out and they have to do more diagnostics.Which i agreed to because at this point i am helpless.

their going to call me when their done.