# Service bulletin 21NA033

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: 10212566
- Published by NHTSA: 2022\-05\-31
- Manufacturer's number: 21NA033
- Manufacturer's date: 2021\-12\-15
- NHTSA component: POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\); POWER TRAIN

## NHTSA's summary

This service bulletin provides a procedure to perform a transmission solenoid clean procedure 3 times depending on what DTC has set.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10212566-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10212566-9999.pdf)

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

## Components

Transmission and driveline, Automatic transmission, Transmission control module

## Vehicles listed

- 2020 to 2022 CHEVROLET CORVETTE

## Other bulletins for the same vehicles and component

- [PIP5781A](/bulletins/10249958.md), 2024-02-12, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE:SOFTWARE; COMMUNICATION; UNKNOWN OR OTHER. This Preliminary information communicates that characterizing certain parts is no longer required, the service instruction was changed but technicians are still trying to perform the function causing further confusion.
- [17\-NA\-066](/bulletins/10239647.md), 2023-07-25, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION; POWER TRAIN. This service bulletin provides information for automatic transmission Oil Cooler Flush and flow test.
- [N212336962](/bulletins/10232726.md), 2023-03-08, Service bulletin: POWER TRAIN; UNKNOWN OR OTHER; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE:SOFTWARE; ELECTRICAL SYSTEM. Emission Recall. General Motors has decided to conduct a Voluntary Emission Recall involving certain vehicles. The Transmission Control Module \(TCM\), after detecting a loss of communications fault with other control modules, may incorrectly clear the loss of communications Diagnostic Trouble Codes \(DTCs\) when the vehicle is keyed off and, if the loss of communications fault persists, may not detect it again when the vehicle is keyed back on. If this were to happen, the transmission could operate in a default mode with no DTC set and the MIL not illuminated. Dealers are to reprogram the Transmission Control Module \(TCM\) with updated software.
- [PIE0740](/bulletins/10232715.md), 2023-03-08, Service bulletin: UNKNOWN OR OTHER; POWER TRAIN; POWER TRAIN:AUTOMATIC TRANSMISSION:INTERNAL:CLUTCHES/BANDS:ACTUATORS/SOLENOIDS. This engineering information \(EI\) is requesting information from technicians to perform the check list provided and contact the engineer listed in regards to the Service Transmission Message and/or Check Engine Lamp illuminated on the Driver Information Center \(DIC\) and having multiple DTCs set.
- [PIP5621C](/bulletins/10224285.md), 2022-10-17, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\); POWER TRAIN. This Preliminary information communicates to the dealer technician that TAC recommends the utilization of the GDS2 software to aid in diagnosing automatic transmission concerns. TAC is requesting the GDS2 session logs be sent in before the dealer contacts TAC.
- [PIE0690A](/bulletins/10211940.md), 2022-05-18, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION. This engineering information \(EI\) closure ends the need for further information from the field in regards to a Transmission Hot message displayed on DIC and/or Vehicle Will Not Disengage from Park, DTCs P0606, P0607 Set.
- [PIP5797C](/bulletins/10208979.md), 2022-03-14, Service bulletin: POWER TRAIN; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\). This Preliminary information communicates the need to replace the transmission assembly for faults related to non\-serviceable internal parts..
- [PIE0669](/bulletins/10205749.md), 2022-01-03, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION. This engineering information \(EI\) is requesting dealership personnel that when it comes to the scheduled maintenance at 12,070 km \(7500 mi\), or within the first year of ownership, to send engineering the Dual Clutch Canister Transmission Filters for inspection after replacement.
- [PIP5818A](/bulletins/10204462.md), 2021-12-13, Service bulletin: ELECTRICAL SYSTEM:12V/24V/48V BATTERY; EQUIPMENT; POWER TRAIN:AUTOMATIC TRANSMISSION. This Preliminary information communicates additional diagnostics for P1789.
- [990420002L](/bulletins/10200154.md), 2021-08-09, Service bulletin: POWER TRAIN:MANUAL TRANSMISSION; POWER TRAIN:AUTOMATIC TRANSMISSION; EQUIPMENT. This service bulletin provides information on Driveline Clunk Noise and what is acceptable and what is considered normal operation.

JSON: [/v1/bulletins/10212566](/v1/bulletins/10212566)

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