TSB N242450631 — Chevrolet and GMC Service campaign
N242450631 is a service campaign on file with NHTSA for 2 Chevrolet and GMC models, 2019–2022 model years. A TSB is factory repair guidance, not a recall — the repair is not automatically free.
What the bulletin says. Service Update. Certain vehicles equipped with a 2.7L engine (RPO L3B), may have an Engine Control Module (ECM) that does not sufficiently control fuel injector flow rate under certain driving conditions. Dealers are to reprogram the ECM.
NHTSA's own summary of the document, quoted from the public manufacturer-communications file.
Worth checking your VIN against. N242450631 is filed as a service campaign, which unlike an ordinary bulletin can mean free or reimbursed work when a vehicle qualifies. Ask a dealer using the document ID below, and check open recalls separately at nhtsa.gov/recalls.
Vehicles and model years N242450631 names
| Vehicle | Model years |
|---|---|
| Chevrolet Silverado 1500 | 2019, 2020, 2021, 2022 |
| GMC Sierra 1500 | 2019, 2020, 2021, 2022 |
Every document filed under N242450631
| Document ID | Filed | Type |
|---|---|---|
| N242450631 | September 12, 2024 | Service campaign |
What N242450631 covers
Engine — the component vocabulary NHTSA files this communication under.
Questions buyers ask
What is TSB N242450631?
N242450631 is a service campaign filed with NHTSA by Chevrolet and GMC, covering 2 Chevrolet and GMC models across the 2019–2022 model years. NHTSA's summary reads: Service Update. Certain vehicles equipped with a 2.7L engine (RPO L3B), may have an Engine Control Module (ECM) that does not sufficiently control fuel injector flow rate under certain driving conditions. Dealers are to reprogram the ECM.
Which vehicles does N242450631 cover?
NHTSA's file names Chevrolet Silverado 1500 (2019–2022); GMC Sierra 1500 (2019–2022). A bulletin number can be re-issued against more vehicles later, so check the model-year list on this page against your own.
Is TSB N242450631 a recall, and is the repair free?
N242450631 is filed as a service campaign, not a recall — but this is the kind of communication that can mean free or reimbursed work if your VIN qualifies. Take the number to a dealer and ask. Recalls are separate and always free; check yours by VIN at nhtsa.gov/recalls.
How do I get the full text of N242450631?
Take the document ID to a dealer's service desk, or search NHTSA's manufacturer-communications records. This page carries every document ID filed under N242450631, its date, and NHTSA's own summary from the public file.
Every number on this page is a count of records in the federal complaint, recall, and investigation files published by NHTSA's Office of Defects Investigation. This page lists only what NHTSA's manufacturer-communications file records under N242450631. Check any specific vehicle's open recalls by VIN at nhtsa.gov/recalls.