[gavin8880]

hello im looking for a solution to a p0421 atc not up to temp code, i work on a fleet og hino 268s and a few of them seem to consistently get p0421, trucks always have to light on the dash but an inactive code, i reqad that there was some faulty units that will get false readings for this code, if anyone else has any similar experiences please reach out

 

[Sony]

hello im looking for a solution to a p0421 atc not up to temp code, i work on a fleet og hino 268s and a few of them seem to consistently get p0421, trucks always have to light on the dash but an inactive code, i reqad that there was some faulty units that will get false readings for this code, if anyone else has any similar experiences please reach out

Welcome to the forum @gavin8880. Is this what you're talking about with the false p0421codes?

https://static.nhtsa.gov/odi/tsbs/2014/MC-10117641-9999.pdf

 

[Willy99220]

Ive had this problem on a fleet of hino 268 years (2018-2019) code p0421 .need some help

 

[gavin8880]

Welcome to the forum @gavin8880. Is this what you're talking about with the false p0421codes?

https://static.nhtsa.gov/odi/tsbs/2014/MC-10117641-9999.pdf

View attachment 26 View attachment 27

Thank you for the tsb, but my trucks are all newer than 2015 which that tsb reffers to:/