2021 Chevrolet Silverado 6500 problems, complaints & recalls
Most-reported problem areas: Service Brakes (2)
Safety recalls (1)
Service Brakes, Hydraulic:brake Fluid Low Warning:switch/Sensor/Float 2025-06-12 · campaign 25V390000 · 62,468 vehicles ⚠ PARK OUTSIDE
Defect: General Motors (GM) is recalling certain 2019-2024 Chevrolet Silverado Medium Duty 4500HD, 5500HD, and 6500HD vehicles. The brake pressure sensor assembly may leak brake fluid into the brake pressure switch and cause a short circuit.
Risk: An electrical short in the brake pressure switch can overheat the circuit and increase the risk of a fire while driving or parked.
Fix: Owners are advised to park outside and away from structures until the recall repair is complete. Dealers will replace the brake pressure switch wire harness, free of charge. Owner notification letters were mailed September 11, 2025. Owners may contact GM customer assistance number at 1-866-467-9700. GM's number for this recall is N242482680. Vehicles in this recall that were previously repaired under 23V266 will need to have the new remedy completed.
Service bulletins (442)
Technical service bulletins are repair instructions manufacturers send dealers for known issues. Unlike recalls, the fix is not automatically free — but naming the bulletin at the service desk can save diagnosis time and support goodwill repairs.
Unknown Or Other 2026-09-26 · PIP6133 · Service Bulletin/Repair Instructions
this pi was created to help address the correct repair regarding a low coolant message on the dic
Unknown Or Other 2026-09-26 · PIT5698F · Service Bulletin/Repair Instructions
this pi provides diagnostics tips on how the lin bus works and how to diagnosis it.
Unknown Or Other 2026-09-04 · PIP4902W · Service Bulletin/Repair Instructions
this preliminary information advises a dealer on how to email gds2 session logs into technical assistance.
Unknown Or Other 2026-08-20 · PIC6551C · Service Bulletin/Repair Instructions
this preliminary information communicates to dealer to perform a mec reset for wireless projection issues
Unknown Or Other 2026-07-21 · PIT5099J · Service Bulletin/Repair Instructions
pi to help diagnose a/c concern
Unknown Or Other 2026-06-23 · PIT5966F · Service Bulletin/Repair Instructions
this preliminary information communicates an issue with an ota pending message still displayed after an ota event and how to reset/clear the message.
Showing the 6 most recent of 442 bulletins. Search all of them free at nhtsa.gov.
What owners report
2025-03-28 · Service Brakes“see attached document for complaint. …”
2023-01-13 · Service Brakes“brake line fitting leaking at the main line pressure fitting. this caused brake fluid to leak out and loss of brakes occured.…”
Excerpts of consumer complaints filed with NHTSA, lightly truncated. They are owner statements, not verified findings.