# Service bulletin 08\-171\-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: 11031666
- Published by NHTSA: 2026\-04\-29
- Manufacturer's number: 08\-171\-26
- Manufacturer's date: 2026\-04\-21
- NHTSA component: UNKNOWN OR OTHER

## NHTSA's summary

Loss Of Cabin Heating Customers must experience a Malfunction Indicator Lamp \(MIL\) illumination and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes \(DTCs\): ● U0615 \- Lost Communication With Engine Coolant Bypass Valve "A". ● U11E9 \- Lost Communication With AGS. Customer may also comment on the following: ● Loss of cabin heating This bulletin involves applying grease to the 3 way valves wire harness connector or, if necessary, the replacement of both the wire harness and the 3 way valve

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11031666-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11031666-9999.pdf)

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

## Trouble codes named

U0615, U11E9

## Vehicles listed

- 2025 to 2026 RAM 2500
- 2025 to 2026 RAM 3500
- 2025 to 2026 RAM 4500
- 2025 to 2026 RAM 5500

JSON: [/v1/bulletins/11031666](/v1/bulletins/11031666)

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