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My unit starts the regen but the DOC inlet temp is only

My unit starts the...

My unit starts the regen but the DOC inlet temp is only getting to 420 degrees and is not allowing to burn off for the regen. I’m getting codes 4752, (intake manifold pressure sensor) 3719, 3711. Will the intake manifold pressure sensor not allowe the regen to get the DOC inlet up to the proper 520 degrees in order to fully perform the regen? 2018 Freightliner Cascadia

Mechanic's Assistant: Have you seen this error before with the same vehicle?

No

Mechanic's Assistant: What's the make/model of your 2018 freightliner?

Cascadia

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Answered in 16 minutes by:
1/30/2021
Technician: mobile-tech, Technician replied 1 year ago
mobile-tech
mobile-tech, Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 998
Experience: Automotive , Medium and Heavy Duty equipment , and Marine Technician with over 20 years of professional experience.
Verified

Hello, my name is Joe.
Sorry for the delay in getting you a response or answer to your question.
I am sorry that you have been experiencing this problem, each question is important, and will do my best to find a resolution.
If any part of my question or answer is unclear, please reply, and I will do my best to clarify.

  • What is your engine model or serial number?

Joe

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Customer reply replied 1 year ago
Dd15(###) ###-####Sorry it's 47291050634731
Technician: mobile-tech, Technician replied 1 year ago

Thanks for the reply.

I will opt out of your question in order for a Detroit Diesel expert to respond.

Joe

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Customer reply replied 1 year ago
Any update?
Technician: Andy, Truck Diagnostic Technician replied 1 year ago
Andy
Andy, Truck Diagnostic Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 3,030
Experience: International and Isuzu trucks , International, Maxxforce, Cummins and Isuzu engines, Diagnostic and electrical troubleshooting specialist , Hvac and truck /trailer refrigeration troubleshooter
Verified

Hi there . My name is ***** ***** I would like to try and help if I can . I need the exact numbers you have for faults please . Each fault should have an SPN number and a smaller FMI number . Thanks

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Customer reply replied 1 year ago
4752 FMI 0 and 15, 3719 FMI 15, 3711, FMI 31Will the intake manifold sensor cause the regen to not get hot enough?
Technician: Andy, Truck Diagnostic Technician replied 1 year ago
When diagnosing a truck , we always need to diagnose the engine faults first ... Once the engine no longer has faults , then we deal with aftertreatment faultsIn answer to your question ... Yes it likely is causing the issue .
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Customer reply replied 1 year ago
That's what I was thinking. Cuz if it was an aftertreatment issue, it wouldn't let the regen run most of the time
Technician: Andy, Truck Diagnostic Technician replied 1 year ago

I will look up intake manifold fault steps

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Customer reply replied 1 year ago
Thank you
Technician: Andy, Truck Diagnostic Technician replied 1 year ago

Once this is resolved , we should try and force a regen to see if it goes through successfully .

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Customer reply replied 1 year ago
Thank you very much
Technician: Andy, Truck Diagnostic Technician replied 1 year ago

You are quite welcome . Please take the time to accept my answer. Good luck and thanks for using Just Answer ! Stay safe !

Andy
Andy, Truck Diagnostic Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 3,030
Experience: International and Isuzu trucks , International, Maxxforce, Cummins and Isuzu engines, Diagnostic and electrical troubleshooting specialist , Hvac and truck /trailer refrigeration troubleshooter
Verified
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Andy
Andy
Andy, Truck Diagnostic Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 3,030
3,030 Satisfied Customers
Experience: International and Isuzu trucks , International, Maxxforce, Cummins and Isuzu engines, Diagnostic and electrical troubleshooting specialist , Hvac and truck /trailer refrigeration troubleshooter

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