# Service bulletin N212350930

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: 10249793
- Published by NHTSA: 2024\-02\-06
- Manufacturer's number: N212350930
- Manufacturer's date: 2024\-02\-06
- NHTSA component: FUEL SYSTEM, GASOLINE

## NHTSA's summary

Service Update. Certain vehicles may incorrectly report to test tools an active permanent status of Transmission Control Module \(TCM\) Diagnostic Trouble Code \(DTC\) P2781 \(Downshift Switch Circuit High\). This could cause the vehicle to not pass an emissions inspection test in jurisdictions that check the permanent status of DTCs as part of an emissions testing program. Reprogram the TCM with updated software.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2024/MC-10249793-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2024/MC-10249793-9999.pdf)

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

## Components

Fuel system

## Trouble codes named

P2781

## Vehicles listed

- 2021 CHEVROLET CORVETTE

## Other bulletins for the same vehicles and component

- [25\-NA\-065](/bulletins/11017173.md), 2025-04-24, Service bulletin: STEERING; SERVICE BRAKES; FUEL/PROPULSION SYSTEM. This informational bulletin instructs the tech when fuel/fluid is needed to be tested and where it can be sent for analysis.
- [PIT5985G](/bulletins/11011885.md), 2024-12-17, Service bulletin: ELECTRICAL SYSTEM; UNKNOWN OR OTHER; FUEL/PROPULSION SYSTEM. This Preliminary information communicates diagnostic tips on how to resolve a issues with vehicles that will not power up after a can bus 2 issue, lightning strike, or a failed over the air update.
- [05\-06\-04\-022V](/bulletins/11007095.md), 2024-09-05, Service bulletin: FUEL/PROPULSION SYSTEM. This bulletin provides information on the TOP TIER Detergent Gasoline Licensed Brands and the TOP TIER Diesel Fuel Licensed Brands that are recommended for use in all GM vehicles and the TOP TIER FUELS website URL.
- [20\-NA\-038](/bulletins/11006377.md), 2024-08-15, Service bulletin: FUEL/PROPULSION SYSTEM. This informational bulletin explains the difference in AFM and DFM engines and what is and is not activated during this occurrence.
- [16\-NA\-383](/bulletins/11004761.md), 2024-07-16, Service bulletin: ENGINE; FUEL/PROPULSION SYSTEM. This service bulletin advises of a new fuel injection cleaner kit used for decarbonizing the intake valves to correct conditions of rough idle, Crank no start, extended crank or misfire, MIL with DTCs, and explains how Top Tier fuels should be used to reduce carbon build\-up.
- [04\-06\-04\-051I](/bulletins/11004727.md), 2024-07-16, Service bulletin: FUEL/PROPULSION SYSTEM. This service bulletin provides information for maintenance cleaning of the fuel injectors and gasoline detergent additive.
- [19\-NA\-044](/bulletins/10250505.md), 2024-02-21, Service bulletin: ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL; FUEL SYSTEM, GASOLINE. This service bulletin provides information on the cold start control system in DI engines to reduce cold start emissions and improve fuel economy.
- [04\-06\-04\-051H](/bulletins/10241417.md), 2023-08-28, Service bulletin: ENGINE AND ENGINE COOLING; FUEL SYSTEM, GASOLINE. This service bulletin provides information for maintenance cleaning of the fuel injectors and gasoline detergent additive.
- [21\-NA\-043](/bulletins/10234144.md), 2023-04-13, Service bulletin: ELECTRICAL SYSTEM; FUEL SYSTEM, GASOLINE; WHEELS; ENGINE AND ENGINE COOLING. This informational bulletin advises the dealers to maintain the vehicle stock on hand by doing a full inspection on the vehicles before being sold \(prepping\) to the customer.
- [05\-06\-04\-022T](/bulletins/10222766.md), 2022-10-11, Service bulletin: ENGINE AND ENGINE COOLING; FUEL SYSTEM, DIESEL; FUEL SYSTEM, GASOLINE. This bulletin provides information on the TOP TIER Detergent Gasoline Licensed Brands and the TOP TIER Diesel Fuel Licensed Brands that are recommended for use in all GM vehicles and the TOP TIER FUELS website URL.

JSON: [/v1/bulletins/10249793](/v1/bulletins/10249793)

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