# Service bulletin 21NA128

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: 10199282
- Published by NHTSA: 2021\-07\-19
- Manufacturer's number: 21NA128
- Manufacturer's date: 2021\-05\-28
- NHTSA component: ELECTRICAL SYSTEM:PROPULSION SYSTEM:TRACTION BATTERY:MANAGEMENT SYSTEM/ENERGY CONTROL MODULE \(BMS/BECM\)

## NHTSA's summary

This technical bulletin provides repair information to correct a customer concern of MIL Illuminated\- ECM Update for P026C, P20EE, or P11D5.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10199282-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10199282-9999.pdf)

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

## Components

Electrical system, Hybrid and electric drive, High\-voltage battery

## Trouble codes named

P026C, P11D5, P20EE

## Vehicles listed

- 2021 CHEVROLET SILVERADO 2500
- 2021 GMC SIERRA 2500

## Other bulletins for the same vehicles and component

- [PIT5676B](/bulletins/10208032.md), 2022-02-14, Service bulletin: EQUIPMENT; ELECTRICAL SYSTEM:PROPULSION SYSTEM:TRACTION BATTERY:THERMAL MANAGEMENT:HOSES, FITTINGS, AND RESERVOIR. This Preliminary information communication provides information to the technician on installing Regular Production Option Code 9L7 Up\-fitter Auxiliary Switches. Technician will need to reference the latest version of General Motors Up\-fitter Integration Bulletin 148. The information can be found at http://www.gmupfitter.com/ under the "Technical Bulletin" Tab and then "Show all bulletins."

JSON: [/v1/bulletins/10199282](/v1/bulletins/10199282)

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