The 2021 Chevrolet 4500HD has two recalls, with the most serious being a brake pressure sensor that can leak fluid into the brake switch, causing an electrical short that may start a fire while the truck is in motion or parked.
The second recall involves lock nuts used in the suspension and steering joints that can break and lose tension, which may cause the steering to become unstable and raise the risk of a crash.
At a glance
What can fail
The brake pressure sensor assembly may leak brake fluid into the brake pressure switch, causing an electrical short-circuit.
What the fix does
Dealers will replace the master cylinder pressure sensor and inspect and replace the wire harness if needed, at no cost.
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Summarized — see the official notice for exact wording, dates, and contacts.
At a glance
What can fail
Hex flange lock nuts in suspension and steering joints were improperly heat treated and may break.
What the fix does
Dealers will replace the affected hex flange lock nuts at no charge.
Summarized — see the official notice for exact wording, dates, and contacts.
