# Service bulletin 18\-024\-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: 11029679
- Published by NHTSA: 2026\-03\-05
- Manufacturer's number: 18\-024\-26
- Manufacturer's date: 2026\-02\-18
- NHTSA component: UNKNOWN OR OTHER

## NHTSA's summary

Flash: Powertrain Control Module \(PCM\) Updates \*\*Customers must experience a Malfunction Indicator Lamp \(MIL\) illumination and the vehicle must SYMPTOM: exhibit/set one or more of the following Diagnostic Trouble Codes \(DTCs\): ● P0128\-00 \- Thermostat Rationality. ● P24A4\-00 \- Particulate Filter Restriction \- Soot Accumulation Too High. ● P208B\-00 \- Reductant Pump 1 Control Performance.\*\* Customers may experience one or more of the following: ● Lower than expected fuel economy when vehicle is lightly loaded, operating in stop and go traffic and at lower speeds. ● Long cranking / extended starting times. \*\*Other software enhancement included with this update: ● "Air Handling Performance Test" is now available to help troubleshoot air handling DTCs.\*\* This bulletin involves 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-11029679-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11029679-9999.pdf)

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

## Trouble codes named

P0128, P208B, P24A4

## Vehicles listed

- 2023 RAM 3500

JSON: [/v1/bulletins/11029679](/v1/bulletins/11029679)

[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%2018-024-26&page=https%3A%2F%2Fopen.wenmarpro.com%2Fbulletins%2F11029679&vehicle=Service%20bulletin%2018-024-26)