2020 Chevrolet Silverado 4500 problems, complaints & recalls
Most-reported problem areas: Service Brakes (1)
Safety recalls (2)
Service Brakes, Hydraulic:power Assist 2025-11-06 · campaign 25V768000 · 891 vehicles
Defect: General Motors, LLC (GM) is recalling certain 2019-2020 Chevrolet Silverado Medium Duty 4500HD, 5500HD, and 6500HD vehicles. These vehicles were remedied under NHTSA Recall 25V390 with a brake jumper wire harness that was assembled without protective tape. A wiring harness that is missing protective tape can allow the wires to become damaged.
Risk: Damaged brake jumper wires can result in power brake assist failure, increasing the risk of a crash.
Fix: Dealers will remove the installed wire harness, apply protective tape, and reinstall the wire harness, free of charge. Owner notification letters are planned to be mailed December 22, 2025. Owners may contact GM customer assistance number at 1-866-467-9700. GM's number for this recall is N252531990. Vehicles in this recall were previously repaired under 25V390 and will need to have the new remedy completed. Vehicle Identification Numbers (VINs) involved in this recall became searchable on NHTSA.
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 (694)
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 2026-07-21 · PIT5099J · Service Bulletin/Repair Instructions
pi to help diagnose a/c concern
Unknown Or Other 2026-04-14 · PIP6108 · Service Bulletin/Repair Instructions
this pi instructs technicians to inspect the ground plane on md silverado vehicles with dtc p251a
Unknown Or Other 2026-04-01 · PIT3271Q · Service Bulletin/Repair Instructions
this preliminary information communicates information about how to determine if a wheel and tires size change is available.
Showing the 6 most recent of 694 bulletins. Search all of them free at nhtsa.gov.
What owners report
2025-07-10 · Service Brakes“vehicle lost engine power on the road. light display came on stating engine reduce power. it would not pull the trailer. had to pull over and the display went away only to appear again later. we brought vehicle to chevrolet dealer . the part needed to hopefully fix is on backorder. there is also recall with no available remedy. this is a revenue ge…”
Excerpts of consumer complaints filed with NHTSA, lightly truncated. They are owner statements, not verified findings.