Safety Recall N222375270 Brake Pressure Switch Connector Fire – 2019-2023 Chevrolet Silverado Medium Duty 4500HD/5500HD/6500HD

April 13, 2023 NHTSA CAMPAIGN NUMBER: 23V266000

Brake Pressure Switch May Short and Cause Fire

An electrical short in the brake pressure switch can overheat the circuit and increase the risk of a fire while driving or parked.


NHTSA Campaign Number: 23V266

Manufacturer General Motors, LLC


Potential Number of Units Affected 40,428



General Motors. LLC (GM) is recalling certain 2019-2023 Chevrolet 4500HD, 5500HD, and 6500HD Medium-Duty trucks. The brake pressure sensor assembly may leak brake fluid into the brake pressure switch and cause an electrical short-circuit.



Owners are advised to park outside and away from structures until the recall repair is complete. Dealers will replace the master cylinder pressure sensor and inspect the wire harness, replacing it, if necessary, free of charge. Interim letters notifying owners of the safety risk are expected to be mailed May 29, 2023. Second letters will be mailed once the remedy is available. Owners may contact Chevrolet customer service at 1-800-222-1020. GM’s number for this recall is N222375270.



Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to


Check if your Vehicle has a Recall


Frequently Asked Questions (FAQs) for Safety Recall N222375270
Brake Pressure Switch Connector Fire

These questions and answers are being provided to help GM dealers respond to inquiries from involved vehicle owners about the Safety Recall identified above.


Q1) Which vehicles are involved?

Certain 2019 – 2023 model year Chevrolet Silverado Medium Duty 4500HD/5500HD/6500HD vehicles


Q2)What is the issue or condition?

These vehicles may have a brake pressure sensor assembly that allows brake fluid to leak beyond the diaphragm seal into the pressure switch.  The brake fluid may seep into the sensor’s electrical components and short the brake pressure switch and the associated fuse.


Q3) What symptoms may be experienced?  What warning signs may be associated with the issue or condition described?

Until the recall remedy is performed, owners are advised to park their vehicles outdoors.  This condition may declare with a “service brake system” malfunction indicator lamp.


Q4) What is the remedy/repair?

Dealers will replace the master cylinder pressure sensor.  Dealers will also inspect the associated wire harness and replace if necessary.


Q5) What is the safety risk?  Is the vehicle safe to drive?

If brake fluid shorts the brake pressure switch and the associated fuse, the circuit can generate excessive heat that could result in a fire, increasing the risk of injury.  An underhood fire may occur when the vehicle is off and possibly unattended.


Q6) Does the customer have to pay for this remedy/repair?

No, this inspection/repair will be done at no cost to the customer.  


Q7) Is the remedy/repair available now?

No, when a sufficient quantity of parts are available, the recall bulletin will be released, and dealers can begin repairing vehicles.


Q8) What should customers do until recall repairs can be completed?  Are there any special instructions?

Until the recall remedy is performed, owners are advised to park their vehicles outdoors.  This condition may declare with a “service brake system” malfunction indicator lamp.


Q9) How can customers check to see if their vehicle is involved in this field action?

Customers who own a vehicle involved in the field action will be notified by mail by General Motors, but they may also check their Vehicle Identification Number (VIN) for field actions in GM Owner Center at or via NHTSA’s website at


Q10) If customers are concerned, can they get a rental car or courtesy transportation? 

Courtesy transportation is not applicable to Medium Duty vehicles.  Towing is covered to the nearest Chevrolet Medium Duty dealer if your vehicle cannot be driven because of a warrantied defect.  Please refer to Warranty Administration Bulletin #07-00-89-037: Warranty Administration – GM Courtesy Transportation and Roadside Assistance Programs for further information.


Chronology :

On August 9, 2022, GM opened a product investigation following a claim of a vehicle fire on a 2019 Chevrolet Silverado Medium Duty vehicle. As part of that investigation, GM coordinated with Navistar, the manufacturer of the subject vehicles, to review field data and warranty returned brake pressure sensors.

While a series of tests failed to duplicate the SUFS vehicle’s condition, on January 25, 2023, a warranty returned sensor and harness was identified which exhibited signs of heat damage. This part was subjected to more detailed analysis, including X-ray scans which were completed on February 13, 2023, followed by chemistry laboratory analysis which was completed on February 28, 2023. The results from these analyses revealed the presence of brake fluid past the diaphragm seal, into the brake pressure switch and through the actual wire harness into the pump’s fuse circuit. Analysis of the returned components also revealed delamination of the corrosion inhibiting sealant, which allowed slow seepage of the brake fluid past the diaphragm seal.

On March 30, 2023, Navistar reported one potentially related field incident involving a part with alleged heat damage. On April 5, 2023, Navistar provided GM a list of potentially affected vehicle VINs.

On April 6, 2023, GM’s Safety Field Action Decision Authority (SFADA) decided to conduct a safety recall. GM’s final analysis of the field data, including legal claims, identified a total of twenty-one potentially related complaints, eleven of which alleged a fire, smoke, or flame. GM was provided notice of those events between July 26, 2021, and January 25, 2023.

GM is not aware of any accidents or injuries associated with this condition.


15 Affected Products


CHEVROLET 4500HD 2019-2023
CHEVROLET 5500HD 2019-2023
CHEVROLET 6500HD 2019-2023


5 Associated Documents

Manufacturer Notices(to Dealers,etc – Dealer Message re Stop Delivery Order for Safety Recall N222375270 Brake Pressure Switch Connector Fire

RCMN-23V266-2754.pdf 66.351KB



Defect Notice 573 Report

RCLRPT-23V266-6802.PDF 214.884KB



Recall Acknowledgement

RCAK-23V266-3257.pdf 645.466KB



Recall 573 Report – 4/14/23

RCLRPT-23V266-8748.PDF 214.882KB



Miscellaneous Document – Frequently Asked Questions (FAQs) for Safety Recall N222375270 Brake Pressure Switch Connector Fire

RMISC-23V266-2918.pdf 104.916KB



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  • DPF Regeneration】Supports exclusive OEM-level DPF function for Caterpillar, John Deere, Volvo, Komatsu, Bobcat diagnosis. Forced regeneration is performed, including DPF regeneration, DPF reset, BlueTec, forced DPR regeneration, DPR reset, differential pressure test, DPD forced regeneration etc., helps you better understand and solve the exhaust aftertreatment system problems, gets better MPG, throttle response, longer DPF life, less downtime and frequent regeneration (passive).
  • 【Manufacture-Level & OBD-Level Diagnostic】HD3600 performs full system diagnosis on construction equipment vehicles and trucks. When the warning lights of the engine, ABS, airbag, transmission or other system flash, HD3600 can help you easily know how serious the fault is. It also do OBD test, such as reading codes, clearing codes, reviewing live data, retrieving vehicle information, etc., so that you can get accurate information, avoid auto repair fraud and save time and money in maintenance.
  • 【Unique Display Wiring Diagram Feature】With the technology of wiring diagram display, you can connect HD3600 to vehicle with the jumper or jumper box without destroying the ECU or connector pins or cable insulation, helping you diagnose various electrical signals of Cummins engine. Meanwhile, you can connect or disconnect the wiring harness by plugging and unplugging the corresponding connector on the jumper box, so even the absence of diagnostic connectors will not delay your work in diagnosis.

Last update on 2023-05-29 / Affiliate links / Images from Amazon Product Advertising API

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