Recall 23V266 covers 40,428 2019-2023 Chevrolet 4500HD, 5500HD, and 6500HD trucks for brake-pressure sensor leaks. Park outside. Repair will be free once available.
An electrical short in the brake pressure switch can overheat the circuit and increase the risk of a fire while driving or parked. Park outside and away from structures until the recall repair is complete. If the service brake system warning light appears, call the dealer and arrange service. Repair will be free at any franchised Chevrolet dealer once available.
Chevrolet is recalling 40,428 2019-2023 4500HD, 5500HD, and 6500HD Medium-Duty trucks because the brake pressure sensor assembly can leak brake fluid into the brake pressure switch and short the circuit. The short can overheat and raise the risk of a fire while driving or parked, so owners should park outside until the free dealer repair is available.
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What's wrong?
The brake master cylinder pressure sensor on 2019-2023 Chevrolet 4500HD, 5500HD, and 6500HD trucks monitors hydraulic brake pressure and sends an electrical signal to the brake system. It sits where brake fluid pressure is measured, so the sensor must keep brake fluid sealed away from the electrical switch and wiring.
On affected trucks, a zinc nickel plating and corrosion-inhibiting sealant inside the pressure sensor assembly can separate. Small pieces of that sealant get under the diaphragm seal during assembly, which lets brake fluid seep past the seal. The fluid can reach the brake pressure switch and travel through the wire harness into the pump fuse circuit, where it can cause an electrical short circuit and heat damage.
Owners are told to watch for a "service brake system" malfunction indicator lamp. Until the recall remedy is performed, GM advises owners to park the truck outdoors.
Who's affected?
Covers the 4500HD, 5500HD, and 6500HD across 2019-2023, all tied to the same brake master cylinder pressure sensor.
| 2021 Chevrolet 5500HD | hydraulic brake system |
|---|---|
| 2022 Chevrolet 5500HD | hydraulic brake system |
| 2022 Chevrolet 6500HD | hydraulic brake system |
| 2023 Chevrolet 4500HD | hydraulic brake system |
| 2019 Chevrolet 6500HD | hydraulic brake system |
| 2023 Chevrolet 5500HD | hydraulic brake system |
| 2023 Chevrolet 6500HD | hydraulic brake system |
| 2022 Chevrolet 4500HD | hydraulic brake system |
| 2021 Chevrolet 4500HD | hydraulic brake system |
| 2021 Chevrolet 6500HD | hydraulic brake system |
| 2020 Chevrolet 6500HD | hydraulic brake system |
| 2019 Chevrolet 4500HD | hydraulic brake system |
| 2020 Chevrolet 4500HD | hydraulic brake system |
| 2019 Chevrolet 5500HD | hydraulic brake system |
| 2020 Chevrolet 5500HD | hydraulic brake system |
| Units affected | 40,428 |
| Field incidents | NHTSA has logged no field incidents to date. |
A matching year and model does not guarantee inclusion. Check your VIN to confirm whether your specific truck is included in this recall.
What's the safety risk?
An electrical short in the brake pressure switch can overheat the circuit and increase the risk of a fire while driving or parked. Park outside and away from structures until the recall repair is complete. If the service brake system warning light appears, call the dealer and arrange service. Repair will be free at any franchised Chevrolet dealer once available.
What should I do?
- Check your VIN to confirm your 2019-2023 Chevrolet 4500HD, 5500HD, or 6500HD is included in this recall.
- Park outside and away from structures until the recall repair is complete.
- Use Chevrolet's owner letter, mailed July 11, 2023, to confirm repair timing before scheduling service.
- Contact a franchised Chevrolet dealer to schedule the free master cylinder pressure sensor replacement and wire-harness inspection that addresses brake fluid leaking into the brake pressure switch.
- Bring the owner letter to the dealer and reference recall number 23V266 and Chevrolet recall N222375270 when you call.
What happens at the repair
Until Chevrolet opens the final dealer repair, park the truck outside and away from structures. Once the repair is available, a Chevrolet technician will replace the master cylinder pressure sensor and inspect the wire harness. If the harness is damaged, the technician will replace it. Parts and labor will be covered under the recall. GM's reimbursement plan covers owners who already paid for a related repair before the recall notice. Keep repair invoices and payment records, then contact Chevrolet customer service or ask the dealer how to submit documentation.
| Reimbursement | Reimbursement available |
|---|
Timeline
| April 13, 2023 | NHTSA published the recall |
|---|---|
| April 13, 2023 | Dealer notification began |
| April 13, 2023 | Dealer notification ended |
| May 29, 2023 | Interim owner notification (was planned for this date) |
| July 11, 2023 | Owner notification mailed |
Frequently asked questions
What is recall 23V266?
Recall 23V266 covers 40,428 2019-2023 Chevrolet 4500HD, 5500HD, and 6500HD medium-duty trucks with a brake pressure sensor assembly that can leak brake fluid into the brake pressure switch. An electrical short can overheat the circuit and increase fire risk while driving or parked.
What should I do if my 2019-2023 Chevrolet 4500HD, 5500HD, or 6500HD is on this recall?
Check your VIN to confirm your specific truck is included in recall 23V266. If it is, park outside and away from structures until the repair is complete, then contact a franchised Chevrolet dealer to schedule the sensor replacement and harness inspection.
Is the recall repair free?
Yes. Federal recall law requires the manufacturer to repair the defect at no cost. Chevrolet dealers will replace the master cylinder pressure sensor and inspect the wire harness, replacing it if needed, free of charge.
What is the fire risk in recall 23V266?
The risk is an electrical short in the brake pressure switch that can overheat the circuit and increase the risk of fire while driving or parked. If your VIN is included, park outside and away from structures until the dealer completes the free recall repair.
When were owners notified about recall 23V266?
Chevrolet mailed owner notification letters on July 11, 2023. If you bought the truck used or never received a letter, the VIN still decides whether the recall applies. You can also call Chevrolet customer service at 1-800-222-1020 and reference GM recall N222375270.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/23V266000 |
|---|---|
| Chevrolet customer service | 1-800-222-1020 |
| NHTSA recall # | 23V266 |
| NHTSA recall # (full) | 23V266000 |
Source documents
-
Download Quarterly Report (PDF) - Download Owner Notification Letter (PDF)
- Download Owner Notice (PDF)
- Download Misc. Document (PDF)
- Download Recall Investigation Document (PDF) (PDF)
- Download Recall Report (PDF)
- Download Recall Document (PDF) (PDF)
- Download Recall Acknowledgement (PDF)
This article is generated from NHTSA's primary recall filings and reviewed against the source on May 20, 2026. RecallNotify does not paraphrase NHTSA's consequence language; that text is reproduced as written above. Editorial standards →