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spankyjr1, Journeyman
Category: Medium and Heavy Trucks
Satisfied Customers: 2612
Experience:  I worked on all types of equipment semis,forklifts,farm,ect.
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I have a Freightliner with DD 15 and have code sid 155 flash

Customer Question

I have a Freightliner with DD 15 and have code sid 155 flash code83 delta pressure too high. Replace DFPE sensor with no change in active code.
Submitted: 2 years ago.
Category: Medium and Heavy Trucks
Expert:  spankyjr1 replied 2 years ago.
Does the code stay active without starting engine?
If it does stay active not running it is most likely a wiring problem, inspect harness around hot parts,,loom clamps, and or wire ties.
If it only comes back after running engine you need a EGR.