Nox sensor abnormal update rate./speed sensor

[Rawze]

(05-25-2021 )DVT873 Wrote:  Cummins has an emissions recall running on NH3 sensors and SCRs. C2119. On ISB 2350's for sure. The NH3 sensor is deleted and the SCR is replaced. I do not know if this applies to the ISX's. Quick Serve should tell you. Have had 3 customers have this done. There is some testing BS they had to pay for. Around $800 but the trucks came back with new SCR's and no NH3 sensors. As I recall. Poke ESN 73667326 for a 2350 ISB in and see what it says.

Something weird about QuickServe. The ESN above has had this done but it shows open in QS. Now when I see one I email Cummins to find out if it has been done or not. This might only be for the light and medium engines. Rawze will know the details.

Some 2350 ISB's and ISC's had an extra NOx sensor. Not all of them do though. They were removing the extra sensor.

Some of the later ISX's have this extra sensor too, but there is not any campaign to remove those that I have seen.

- Just make sure you have the latest software update for your truck and engine. If it has been more than 2 years since it has been updated then that is one more thing to have done.