# Service bulletin 25\-008\-24

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 11010636
- Published by NHTSA: 2024\-11\-18
- Manufacturer's number: 25\-008\-24
- Manufacturer's date: 2024\-11\-14
- NHTSA component: UNKNOWN OR OTHER
- Manufacturer's system: Diesel Exhaust Fluid

## NHTSA's summary

"Flash: Diesel Exhaust Fluid \(DEF\) Dosing Control Unit \(DCU\) Update Customers must experience a Malfunction Indicator Lamp \(MIL\) illumination and the vehicle must exhibit/set the following Diagnostic Trouble Code \(DTC\): ● P21C4\-00 \- Reductant Line Heater Relay Control Circuit High. ● U11C1\-00 \- Reductant Control Module Received Implausible Data From ECM/PCM. These DTCs will occur after installation of service DCU 68458603AB. This bulletin involves reprogramming the DCU with the latest available software."

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2024/MC-11010636-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2024/MC-11010636-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Trouble codes named

P21C4, U11C1

## Vehicles listed

- 2019 to 2024 RAM 2500
- 2019 to 2024 RAM 3500
- 2019 to 2024 RAM 4500
- 2019 to 2024 RAM 5500

JSON: [/v1/bulletins/11010636](/v1/bulletins/11010636)

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