# Service bulletin S1625000002 REV.B

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: 11015599
- Published by NHTSA: 2025\-03\-13
- Manufacturer's number: S1625000002 REV.B
- Manufacturer's date: 2025\-03\-10
- NHTSA component: UNKNOWN OR OTHER
- Manufacturer's system: Dosing Control Module

## NHTSA's summary

Malfunction Indicator Lamp \(MIL\) Illumination, Diagnostic Trouble Codes \(DTCs\) P21C4 – \(Diesel Exhaust Fluid\) Reductant Line Heater Control Circuit High, and U11C1 – Reductant Control Module Received Implausible Data From ECM/PCM, Set

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2025/MC-11015599-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2025/MC-11015599-9999.pdf)

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

## Trouble codes named

P21C4, U11C1

## Vehicles listed

- 2013 to 2024 RAM 2500
- 2013 to 2024 RAM 3500
- 2013 to 2024 RAM 4500
- 2013 to 2024 RAM 5500

JSON: [/v1/bulletins/11015599](/v1/bulletins/11015599)

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