# Service bulletin 21\-NA\-049

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: 11013241
- Published by NHTSA: 2025\-01\-30
- Manufacturer's number: 21\-NA\-049
- Manufacturer's date: 2025\-01\-14
- NHTSA component: POWER TRAIN

## NHTSA's summary

This service bulletin provides a Diagnostic Aid for PicoScope Information and Setup for Transmission Related Concerns.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2025/MC-11013241-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2025/MC-11013241-9999.pdf)

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

## Components

Transmission and driveline

## Vehicles listed

- 2020 to 2025 CHEVROLET CORVETTE

## Recalls for the same vehicles and component

- [22V091000](/recalls/nhtsa/22V091000.md), 2022-02-17: POWER TRAIN:DRIVELINE:DRIVESHAFT

## Other bulletins for the same vehicles and component

- [PIE0835](/bulletins/11023059.md), 2025-09-10, Service bulletin: POWER TRAIN. This engineering information \(EI\) is requesting information from technicians to perform the check list provided and contact the engineers listed in regard to Transmission Main Control Valve Body Replacement.
- [PI0281L](/bulletins/11019516.md), 2025-06-12, Service bulletin: STEERING; POWER TRAIN; SUSPENSION. This preliminary informational \(PI\) bulletin provides information to dealership personnel that may be helpful when addressing underbody component corrosion with customers.
- [23\-NA\-156](/bulletins/11017254.md), 2025-04-28, Service bulletin: POWER TRAIN. This service bulletin informs the technician on the running changes to the M1L, M1M and MLH automatic transmission.
- [24\-NA\-273](/bulletins/11013093.md), 2025-01-24, Service bulletin: POWER TRAIN; ELECTRICAL SYSTEM. This service bulletin provides a procedure to replace the Drive Motor Disconnect Clutch Actuator to correct a customer concern of a Malfunction Indicator Lamp \(MIL\) with DTC U01BE.
- [09\-06\-04\-026Z](/bulletins/11013069.md), 2025-01-23, Service bulletin: ENGINE; POWER TRAIN; ELECTRICAL SYSTEM. This bulletin provides information on identifying Non\-GM Engine Calibrations for Gasoline Engines using the Tech 2 or GDS 2.
- [24\-NA\-025](/bulletins/11013030.md), 2025-01-23, Service bulletin: ENGINE; POWER TRAIN; ELECTRICAL SYSTEM. This service bulletin provides information to correct a customer concern of Check Engine Light or Malfunction Indicator Lamp Illuminated with DTCs U0401 and/or U1611 Set.
- [23\-NA\-156](/bulletins/11012873.md), 2025-01-16, Service bulletin: POWER TRAIN. This service bulletin informs the technician on the running changes to the M1L, M1M, MLH automatic transmissions.
- [08\-07\-30\-035I](/bulletins/11011989.md), 2024-12-19, Service bulletin: POWER TRAIN. This service bulletin provides information on the harmful effects of ethylene glycol in transmission fluid.
- [24\-NA\-025](/bulletins/11011957.md), 2024-12-19, Service bulletin: ENGINE; POWER TRAIN; ELECTRICAL SYSTEM. This service bulletin provides information to correct a customer concern of Check Engine Light or Malfunction Indicator Lamp Illuminated with DTCs U0401 and/or U1611 Set.
- [PIP6026](/bulletins/11011683.md), 2024-12-09, Service bulletin: POWER TRAIN; UNKNOWN OR OTHER. This Preliminary Information communication advises the technician on the need to provide additional information when creating a TAC case for a DCT transmission

JSON: [/v1/bulletins/11013241](/v1/bulletins/11013241)

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