# Service bulletin 18\-064\-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: 11034362
- Published by NHTSA: 2026\-07\-02
- Manufacturer's number: 18\-064\-26
- Manufacturer's date: 2026\-06\-26
- NHTSA component: ENGINE; POWER TRAIN

## 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 \(DTCs\): ● \*\*P0420 \- Catalyst System Efficiency Below Threshold Bank 1. ● P0430 \- Catalyst System Efficiency Below Threshold Bank 2.\*\* ● P0456 \- EVAP System Small Leak. \*\*Customers may also comment on one or more of the following: ● Vehicle fails emissions inspection testing.\* 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-11034362-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11034362-9999.pdf)

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

## Components

Engine, Transmission and driveline

## Trouble codes named

P0420, P0430, P0456

## Vehicles listed

- 2019 CHRYSLER TOWN AND COUNTRY
- 2019 DODGE CARAVAN

JSON: [/v1/bulletins/11034362](/v1/bulletins/11034362)

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