2021 Chevrolet SILVERADO 4500: complaints, problems and recalls
Explore the records behind recurring owner reports.
Key facts
2 owner complaints analyzed
1 distinct recall campaigns
Not available median reported failure mileage
Scope: 2021 model year. Data updated: . 0 complaints include usable failure mileage. View data status.
This selection has limited data. It remains available for lookup but is excluded from search indexing.
Most common problems
Service Brakes, Hydraulic is the most frequently named component, appearing in 2 of 2 complaints (100.0%). A complaint can name multiple components.
| Topic | Matching reports | Share of complaints |
|---|---|---|
| Braking behavior | 2 | 100.0% |
Topic matches use published keyword rules. They describe mentions, including negations or comparisons, and do not confirm a diagnosis. Read the matching rules.
Component breakdown
Number of unique complaints naming each component. Top eight shown.
| Category | Count |
|---|---|
| Service Brakes, Hydraulic | 2 |
Service Brakes, Hydraulic: 2
Reported problems by failure mileage
Complaint counts in mileage bands. These are not failure rates per vehicle or mile.
| Category | Count |
|---|---|
| Under 25,000 | 0 |
| 25,000 to 49,999 | 0 |
| 50,000 to 74,999 | 0 |
| 75,000 to 99,999 | 0 |
| 100,000 to 149,999 | 0 |
| 150,000 and above | 0 |
Under 25,000: 0; 25,000 to 49,999: 0; 50,000 to 74,999: 0; 75,000 to 99,999: 0; 100,000 to 149,999: 0; 150,000 and above: 0
No usable failure mileage is recorded. 2 complaints have missing, zero or invalid mileage.
Complaints over time
Year the complaint was filed, not the vehicle model year or incident year. The snapshot year is partial.
| Category | Count |
|---|---|
| 2023 | 2 |
2023: 2
Pattern summary
Service Brakes, Hydraulic leads the component reports. Braking behavior appears in 2 complaint narratives. Use these patterns to inspect individual reports and prepare questions for a mechanic.
Calculated from recorded counts. An AI narrative has not been published for this selection.
Examples from the source records
Examples provide context, not a representative sample or a verified diagnosis.
Owner report 11520061 · 2023-05-02 (May 2, 2023)
The contact owns a 2021 Chevrolet Silverado 4500HD. The contact received notification of Manufacturer Recall Number: N222375270 (Service Brakes, Hydraulic), NHTSA Campaign Number: (TBD) however, the part to do the recall repair was not yet available. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The dealer was made aware of the issue. The manufacturer was not made aware of the issue. The contact had not experienced a failure. Parts distribution disconnect.
Owner-reported narrative. Look up ODI 11520061 at NHTSA ↗
Owner report 11524533 · 2023-05-30 (May 30, 2023)
The contact owns a 2021 Chevrolet Silverado 4500HD. The contact received notification of NHTSA Campaign Number: (TBD); Manufacturer Recall Campaign Number: N222375270 (Service Brakes, Hydraulic) however, the part to do the recall repair was not yet available. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The dealer was not made aware of the issue. The manufacturer was not made aware of the issue. The contact had not experienced a failure. VIN tool confirms parts not available.
Owner-reported narrative. Look up ODI 11524533 at NHTSA ↗
Recall history
1 distinct campaigns affect this selection. Announcement dates below are different from vehicle model years. A campaign may cover multiple years.
25V390000 · Service Brakes, Hydraulic:Brake Fluid Low Warning:Switch/Sensor/Float
Reported: 2025-06-12 (June 12, 2025)
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.
Consequence: An electrical short in the brake pressure switch can overheat the circuit and increase the risk of a fire while driving or parked.
Remedy: 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.
NHTSA campaign record ↗Vehicle analysis explorer
Inspect model-year patterns, reported mileage, monthly activity and the evidence behind each signal.
Data completeness
2 unique complaints in this selection. Analysis snapshot: 2026-10-01.
Missing, zero and invalid mileage is excluded. Dates after the snapshot are excluded. Examples are limited selections, not a representative sample.
Problems by model year
Model-wide comparison of the eight most reported components across the model. Cells show counts and shares within each model year. Open a cell for source examples.
| Component | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
|---|---|---|---|---|---|---|
| Service Brakes, Hydraulic | 0UnavailableNo examples available for this selection. | 00.0%No examples available for this selection. | 2100.0%ODI 11520061The contact owns a 2021 Chevrolet Silverado 4500HD. The contact received notification of Manufacturer Recall Number: N222375270 (Service Brakes, Hydraulic), NHTSA Campaign Number: (TBD) however, the part to do the recall repair was not yet available. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The dealer was made aware of the issue. The manufacturer was not made aware of the issue. The contact had not experienced a failure. Parts distribution disconnect. | 0UnavailableNo examples available for this selection. | 1100.0%ODI 11633661 · 59,500 miThe contact owns a 2023 GM GM515. The contact stated that the vehicle was designed with a 12-Volt power brake booster auxiliary pump. The contact stated that upon parking and turning off the vehicle, the power brake booster auxiliary pump was running and making a loud sound. The contact stated that upon starting the vehicle, the pump stopped running; however, the failure recurred while the vehicle was turned off. The brake warning light was illuminated. The contact stated that upon disconnecting the power brake booster auxiliary pump wiring cab… | 0UnavailableNo examples available for this selection. |
| Engine | 0UnavailableNo examples available for this selection. | 1100.0%ODI 11672450Vehicle 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 generating vehicle. We had this problem happen on and off. Dealer didn't want us to bring in until the light physically stayed on dashboard for them to assess vehicle. It was now been in shop for over 2… | 00.0%No examples available for this selection. | 0UnavailableNo examples available for this selection. | 00.0%No examples available for this selection. | 0UnavailableNo examples available for this selection. |
| Power Train | 0UnavailableNo examples available for this selection. | 1100.0%ODI 11672450Vehicle 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 generating vehicle. We had this problem happen on and off. Dealer didn't want us to bring in until the light physically stayed on dashboard for them to assess vehicle. It was now been in shop for over 2… | 00.0%No examples available for this selection. | 0UnavailableNo examples available for this selection. | 00.0%No examples available for this selection. | 0UnavailableNo examples available for this selection. |
| Service Brakes | 0UnavailableNo examples available for this selection. | 1100.0%ODI 11672450Vehicle 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 generating vehicle. We had this problem happen on and off. Dealer didn't want us to bring in until the light physically stayed on dashboard for them to assess vehicle. It was now been in shop for over 2… | 00.0%No examples available for this selection. | 0UnavailableNo examples available for this selection. | 00.0%No examples available for this selection. | 0UnavailableNo examples available for this selection. |
Darker cells indicate a larger share of submitted complaints. Components overlap. This measures complaint composition, not failure probability.
Failure mileage by component
Median and middle 50% of usable owner-reported mileages. Ranges require at least five records.
| Component | Mileage range (25th–75th percentile) | Median | Usable records | Examples |
|---|---|---|---|---|
| No usable records for this analysis. | ||||
Complaint and recall timeline
Explore monthly filing activity alongside recall announcements. Up to ten years of monthly history is available.
Solid line: filed complaints. Dashed amber lines: recall announcement dates for this vehicle selection; markers include all recall components. The latest month is partial. Temporal proximity does not establish causation.
Monthly counts, recall campaigns and complaint examples
| Month | Complaints | Campaigns announced | Examples |
|---|---|---|---|
| 2024-11 | 0 | None | No examples available for this selection. |
| 2024-12 | 0 | None | No examples available for this selection. |
| 2025-01 | 0 | None | No examples available for this selection. |
| 2025-02 | 0 | None | No examples available for this selection. |
| 2025-03 | 0 | None | No examples available for this selection. |
| 2025-04 | 0 | None | No examples available for this selection. |
| 2025-05 | 0 | None | No examples available for this selection. |
| 2025-06 | 0 | 25V390000 | No examples available for this selection. |
| 2025-07 | 0 | None | No examples available for this selection. |
| 2025-08 | 0 | None | No examples available for this selection. |
| 2025-09 | 0 | None | No examples available for this selection. |
| 2025-10 | 0 | None | No examples available for this selection. |
| 2025-11 | 0 | None | No examples available for this selection. |
| 2025-12 | 0 | None | No examples available for this selection. |
| 2026-01 | 0 | None | No examples available for this selection. |
| 2026-02 | 0 | None | No examples available for this selection. |
| 2026-03 | 0 | None | No examples available for this selection. |
| 2026-04 | 0 | None | No examples available for this selection. |
| 2026-05 | 0 | None | No examples available for this selection. |
| 2026-06 | 0 | None | No examples available for this selection. |
| 2026-07 | 0 | None | No examples available for this selection. |
| 2026-08 | 0 | None | No examples available for this selection. |
| 2026-09 | 0 | None | No examples available for this selection. |
| 2026-10 (partial) | 0 | None | No examples available for this selection. |
Emerging complaint spikes
Complete months in the latest six months with at least 10 complaints, at least twice the preceding 12-month average, and at least three square-root deviations above that average.
This is a descriptive screening rule, not a statistical defect finding. Publicity and reporting changes can increase submissions.
No complete months meet the spike thresholds for this selection.
Equal-age model-year comparison
Model-wide cumulative reports during the first three or five calendar years, starting with the model year (age 0). Only fully elapsed windows are compared.
2022: 0 complaints · 2023: 1 complaints
| Model year | Through age 0 | Through age 1 | Through age 2 |
|---|---|---|---|
| 2022 | 0 | 0 | 0 |
| 2023 | 0 | 1 | 1 |
Date coverage across each selected cohort
| Year | Incident dates used | Filing date fallbacks | Excluded dates |
|---|---|---|---|
| 2022 | 0 | 0 | 0 |
| 2023 | 1 | 0 | 0 |
Incident date is preferred when valid and no later than filing; otherwise filing date is used. Model year approximates age. Equal observation time does not adjust for sales, distance driven or reporting delays. One complaint linked to multiple model years can appear in each cohort.
Components reported together
Each cell counts unique complaints naming both components. Open a nonzero cell for examples.
| Component | Service Brakes, Hydraulic |
|---|---|
| Service Brakes, Hydraulic | — |
Co-reporting does not establish that one component caused another concern.
Recurring narrative patterns
Specific keyword mentions beyond broad component labels. Matching includes negations and comparisons and does not confirm a diagnosis.
0 patterns with matching reports.
No narratives match the published patterns.