code P0420

[bjwright]

I am just getting ready to hookup the fifthwheel and and head for Arizonia in the morning and I got a trouble code P0420 catalyst efficiency bank one , and I was wondering if I can take care of it when I get to my destination, about 400 miles.

 

[DonFitzwater]

You should fill out your signature so we know what kind of truck you have, for starters.

https://www.turbodieselregister.com/threads/249728-PCM-Flash-32370231AJ?highlight=P0420

Review this thread and see if your truck needs this update. If it does, have your dealer perform the update and see if the problem goes away.

 

[Wayne M.]

That's a gasser code.

 

[Bob4x4]

When I get home I will look up the code. Stuck in traffic-sucks

 

[Bob4x4]

What year is the truck?

 

[Bob4x4]

P0420-CATALYST EFFICIENCY BANK 1 For a complete wiring diagram Refer to Section 8W. Theory of Operation
The aftertreatment diesel oxidation catalyst is designed to react with hydrocarbons in the exhaust stream, this chem- ical reaction reduces hydrocarbon emission levels and also produces heat. Periodically. the ECM win utilize the heat generated by this reaction in the aftertreatment diesel oxidation catalyst to actively regenerate and clean the after- treatment diesel particulate filter. This diagnostic checks that the aftertreatment diesel oxidation catalyst is present and functioning correctly. The ECM monitors the efficiency of the aftertreatment diesel oxidation catalyst through interpretation of data received from. the aftertreatment diesel oxidation catalyst jnlet and diesel particulate filter inlet temperature sensors, the monitor checks for a temperature rise across the aftertreatment diesel oxidation catalyst. The ECM will set the fault if it detects that the aftertreatment diesel oxidation catalyst is not present in the after- treatment/exhaust system. The ECM will illuminate the MIL lamp immediately when the diagnostic runs and fails. The ECM will turn off the MIL lamp immediately after the diagnostic runs and passes.
• When Monitored:
This diagnostic runs when the engine is running, and performing an active regeneration of the aftertreatment particulate filter.
• Set Condition:
The ECM will set the fault if it detects that the aftertreatment diesel oxidation catalyst is not present in the aftertreatmentlexhaust system.
Possible Causes
AFTERTREATMENT DIESEL OXIDATION CATALYST HAS BEEN REMOVED FROM THE VEHICLE AFTERTREATMENT DIESEL OXIDATION CATALYST IS DAMAGED OR NOT FUNCTIONING PROPERLY
AFTERTREATMENT DIESEL OXIDATION CATALYST INLET AND/OR OUTLET TEMPERATURE SENSORS ARE DAMAGED/FAILED
IMPROPER FUELING
WIRING HARNESS

 

[Bob4x4]

I would not head out on a trip till i took care of it.

 

[Wayne M.]

Well I learned something today. I guess the DOC banks o2 like a gas engine TWC. They're looking at pre and post o2 profiles. That sneaky EPA.

 

[DonFitzwater]

Well I learned something today. I guess the DOC banks o2 like a gas engine TWC. They're looking at pre and post o2 profiles. That sneaky EPA.

Don't you learn something every day? I know I do!!!

 

[Bob4x4]

Well I learned something today. I guess the DOC banks o2 like a gas engine TWC. They're looking at pre and post o2 profiles. That sneaky EPA.

It's even worse than that. The ECM learns the o2 sensor-swap sensors front to rear and it will trip a Dtc and tell you they have been swapped