# Service bulletin PIT6505

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: 11031515
- Published by NHTSA: 2026\-04\-23
- Manufacturer's number: PIT6505
- Manufacturer's date: 2026\-04\-16
- NHTSA component: UNKNOWN OR OTHER

## NHTSA's summary

This preliminary information communicates an issue with an SES MIL DTC P2B87 and/or P2B86 cause by the Aux heater coolant pump have an unwanted oring stuck in the pump. Dealers are to remove oring and reinstall pump.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11031515-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11031515-9999.pdf)

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

## Trouble codes named

P2B86, P2B87

## Vehicles listed

- 2024 to 2026 CADILLAC ESCALADE
- 2024 to 2026 CADILLAC ESCALADE ESV
- 2024 CHEVROLET SUBURBAN
- 2025 to 2026 CHEVROLET SUBURBAN 1500
- 2024 to 2026 CHEVROLET TAHOE
- 2024 to 2026 GMC YUKON
- 2024 to 2026 GMC YUKON XL

JSON: [/v1/bulletins/11031515](/v1/bulletins/11031515)

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