# Service bulletin PIT6177B

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: 11012973
- Published by NHTSA: 2025\-01\-20
- Manufacturer's number: PIT6177B
- Manufacturer's date: 2025\-01\-10
- NHTSA component: UNKNOWN OR OTHER

## NHTSA's summary

This Preliminary information communicates an issues of the left rear leaf spring making a squeaking noise due to diesel fuel contamination that may occur during refueling after the fuel nozzle is removed from the fuel filler pipe. Dealers are to create a foam seal around the fuel filler pipe to prevent fuel from leaking onto the left spring.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2025/MC-11012973-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2025/MC-11012973-9999.pdf)

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

## Vehicles listed

- 2020 to 2025 CHEVROLET SILVERADO 1500
- 2020 to 2025 GMC SIERRA 1500

JSON: [/v1/bulletins/11012973](/v1/bulletins/11012973)

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