# Service bulletin 18\-004\-26

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: 11028231
- Published by NHTSA: 2026\-02\-04
- Manufacturer's number: 18\-004\-26
- Manufacturer's date: 2026\-01\-27
- NHTSA component: ENGINE

## NHTSA's summary

Flash: Powertrain Control Module \(PCM\) Updates Customers must experience a Malfunction Indicator Lamp \(MIL\) illumination and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes \(DTCs\): ● P1404 \- EGR Close Position Performance. Customers may also comment on one or more of the following: ● Engine tugging. ● Unstable idle. This bulletin involves inspecting and possibly reprogramming the PCM with the latest available software.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11028231-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11028231-9999.pdf)

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

## Components

Engine

## Trouble codes named

P1404

## Vehicles listed

- 2024 RAM 2500
- 2024 RAM 3500
- 2024 RAM 4500
- 2024 RAM 5500

## Other bulletins for the same vehicles and component

- [114254](/bulletins/11036754.md), 2026-09-03, Service bulletin: ENGINE. RADIATOR \- ENGINE COOLING
- [114255](/bulletins/11036753.md), 2026-09-03, Service bulletin: ENGINE. RADIATOR \- ENGINE COOLING
- [113744](/bulletins/11035981.md), 2026-08-06, Service bulletin: ENGINE; ELECTRICAL SYSTEM. SENSOR \- TURBOCHARGER SPEED
- [113742](/bulletins/11035980.md), 2026-08-06, Service bulletin: ENGINE; ELECTRICAL SYSTEM. SENSOR \- TURBOCHARGER SPEED
- [113293](/bulletins/11035080.md), 2026-07-18, Service bulletin: ENGINE. INJECTOR \- FUEL
- [113292](/bulletins/11035073.md), 2026-07-18, Service bulletin: ENGINE. INJECTOR \- FUEL
- [112906](/bulletins/11034373.md), 2026-07-02, Service bulletin: ENGINE. BEARING \- CRANKSHAFT THRUST and KIT
- [112906](/bulletins/11034337.md), 2026-07-02, Service bulletin: ENGINE. BEARING \- CRANKSHAFT THRUST and KIT
- [9100692 Rev 1](/bulletins/11033001.md), 2026-05-28, Service bulletin: ENGINE. On Cummins diesel applications that are for 2019 and newer the bpro part 1BP00507AB can on occasions create a check engine light. In these situations, it is recommended to use the appropriate Mopar air filter originally installed on the vehicle. The "AC" level of the part is in development to resolve this issue. 1BP00507AB should still be usable for 2018 and older Model year Cummins engines.
- [111478](/bulletins/11032990.md), 2026-05-28, Service bulletin: ENGINE. RADIATOR \- ENGINE COOLING

JSON: [/v1/bulletins/11028231](/v1/bulletins/11028231)

[Report an error on this page](https://github.com/wenmar-pro/wenmar-open/issues/new?template=data_correction.yml&title=Data%20correction%3A%20Service%20bulletin%2018-004-26&page=https%3A%2F%2Fopen.wenmarpro.com%2Fbulletins%2F11028231&vehicle=Service%20bulletin%2018-004-26)