TSB PIT5687B — Chevrolet and GMC Service bulletin
PIT5687B is a service bulletin on file with NHTSA for 2 Chevrolet and GMC models, 2019–2021 model years. A TSB is factory repair guidance, not a recall — the repair is not automatically free.
What the bulletin says. This PI provide diagnostic tip for an SES MIL with DTC P16A7 and/or P16AF. Dealers are to inspect for a loose connection.
NHTSA's own summary of the document, quoted from the public manufacturer-communications file.
Vehicles and model years PIT5687B names
| Vehicle | Model years |
|---|---|
| Chevrolet Silverado 1500 | 2019, 2020, 2021 |
| GMC Sierra 1500 | 2019, 2020, 2021 |
Every document filed under PIT5687B
| Document ID | Filed | Type |
|---|---|---|
| PIT5687B | May 8, 2026 | Service bulletin |
Questions buyers ask
What is TSB PIT5687B?
PIT5687B is a service bulletin filed with NHTSA by Chevrolet and GMC, covering 2 Chevrolet and GMC models across the 2019–2021 model years. NHTSA's summary reads: This PI provide diagnostic tip for an SES MIL with DTC P16A7 and/or P16AF. Dealers are to inspect for a loose connection.
Which vehicles does PIT5687B cover?
NHTSA's file names Chevrolet Silverado 1500 (2019–2021); GMC Sierra 1500 (2019–2021). 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 PIT5687B a recall, and is the repair free?
No. PIT5687B is repair guidance the manufacturer sent its dealers, not a safety defect finding. You pay for the work unless the vehicle is still under warranty. Recall repairs, by contrast, are always free.
How do I get the full text of PIT5687B?
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 PIT5687B, 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 PIT5687B. Check any specific vehicle's open recalls by VIN at nhtsa.gov/recalls.