Issue with 2012 Freightliner Cascadia

Discussion in 'Freightliner Forum' started by or1g1n4l01, Dec 30, 2018.

  1. or1g1n4l01

    or1g1n4l01 Bobtail Member

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    Dec 30, 2018
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    Hello everyone, I would like some help maybe if someone experienced the following or has any advice I would appreciate it. Onwards to the issue, I have a 2012 Freightliner Cascadia with a DD15 engine, that has about 650,000 miles on the truck and about 250,000 on the motor. The motor was replaced very recently with a used motor. Initially, after installing the motor the truck had a big oil leak which was repaired by replacing the o-rings on injector #s 3 and 4 and a seal in the air compressor. Afterwards, the truck seemed fine until I was on the freeway and it throws both of the check engine lights and the stop engine light. I pull over to check the dashboard diag and it had thrown 9 codes 6 of which were the injectors, the engine has 6 injectors and the computer shows that every single injector is bad along with 2 vehicle speed sensor codes and a position sensor code I think for the camshaft. The truck usually runs fine for maybe 1.5 hrs of continuous use from cold start. After the truck throws the codes I pull over to check and the truck shuts off. When I go to turn on the truck the lights return immediately after turning the engine on and requests to shut off the truck. If I rev the engine above 1000 rpm it will force a shutdown SOMETIMES, even if I am holding the shutdown override, other times it will allow me to keep trucking as long as I hold the shutdown override button on the dash, in other words, this is an intermittent condition, with a symptom, that is intermittent, within the bigger intermittent issue. If the truck allows me to keep trucking I do so but every 15-30 seconds the truck has a momentary jerk I am assuming that is the engine attempting to stop due to the stop engine light but doesn't because of the override switch or perhaps because I am moving. My mechanic has replaced the engine harness and the issue is still there. Every time this happens all of the codes above happen at the same time usually starts with the VSS code then piles on the injector codes and lastly the position sensor in that order every time. Has anyone ever experienced anything like this? If so what fixed the issue for you and if anyone has any advice it will not go unnoticed.
    -Thank You
     
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  3. ast26909

    ast26909 Medium Load Member

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    Mar 1, 2018
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    Your mechanic needs to ohm out the injectors and injector harness when the problem is happening, you are right this is an intermittent problem and it's very difficult to pin it down the problem is most likely the injectors or injector harness. I have 13 Cascadia and it was having the same symptoms except it was setting codes for injector #5 & #6, when I ohm out the injectors at the injector harness connector #5 & #6 was out of spec. I replace ALL injectors with OEM injectors and injector harnesses and problem went away.

    I would say you want to replace ALL injectors and the 2 injector harnesses under the valve cover it probably will solve your problems, it's possible you have more than one problem as you also have the speed sensor codes. You can buy a set of brand new injectors on eBay for $2600 the injector harnesses they are about $200 from the dealer. Use only NEW (eBay) or Bosch-rebuilt injectors (from dealer or M&D distributors), the rebuilt injectors on eBay are junk do not buy them. The injectors only last about 500k miles on these engines so replace ALL at the same time you will save time and money down the road.
     
  4. or1g1n4l01

    or1g1n4l01 Bobtail Member

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    Dec 30, 2018
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    Thanks for your input I will pass the message to my mechanic and post what ends up working.
     
  5. TotalTruck

    TotalTruck Bobtail Member

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    Jul 29, 2021
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    What fixed this for you? I have the same problem!! Help please!!
     
  6. Cashman121

    Cashman121 Bobtail Member

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    Sep 26, 2021
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    Hello I have a 2012 Freightliner Cascades DD15 and trying to find a fix . The truck would not go pass 68 MPH . So I took it to shop to have it turned up . The shop put it on the computer and said they turned it up . By the way I had this done at two different locations. Will not go pass 68 MPH . Does anyone know what it can be ?
     
  7. QUALITYTRUCK

    QUALITYTRUCK Road Train Member

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    Jun 14, 2009
    romulus,mi
    0
    They must not know that there is more than one parameter that needs to be changed in DDDL.
     
    msh Thanks this.
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