The vehicle is experiencing an under-chassis manufacturing wiring harness restriction (Connector X185) that was installed too tightly from the factory, dropping the 5-volt reference power circuit down to 0 volts under load. This intermittent electrical failure completely starves the fuel pump, causing the fuel loop pressure to drop to a dangerous 43.5 PSI while driving (GM factory specification is 55–100 PSI). This electrical breakdown simultaneously chokes the fuel tank vapor loops, causing the fuel tank pressure to spike to an extreme -1100 vacuum pressure parameter. This results in severe engine hesitation, random vehicle starving of fuel, an abysmal 9.9 MPG average compared to the 13 MPG combined standard, and an automated network communication failure resulting in four distinct audible dashboard warning beeps. It also cuts power to the Brake Pedal Position sensor, crashing the StabiliTrak traction control system. This creates a severe, immediate safety hazard under heavy highway driving conditions. This active powertrain hazard has been verified by a certified independent service center via secondary diagnostic data stack logs. MacMulkin Chevrolet is currently holding the commercial vehicle and explicitly refusing to execute the necessary wiring harness circuit trace to resolve the underlying hazard because a dashboard light is not illuminated, leaving a documented safety defect completely un-repaired on a commercial asset.
The worst 2020 Chevrolet Express problems
Ranked by number of owner complaints. Mileage and cost come from what owners wrote.
- Transmission9
- Body3
- Electrical3
- Engine3
- Brakes2
Problems by type
Tap a problem to see which part fails, at what mileage and in which other years.
- Transmission9
- Body3
- Electrical3
- Engine3
- Brakes2
- Fuel system1
Recalls 1
Tires
- What is wrong
- General Motors LLC (GM) is recalling certain 2020 Buick Enclave, Cadillac XT4, XT5, Escalade, Escalade ESV, Chevrolet Suburban, Tahoe, Traverse, GMC Yukon, Yukon XL, 2018-2021 Chevrolet Express, GMC Savana, 2019-2020 Chevrolet Blazer, Silverado 1500, GMC Acadia, Sierra 1500, and certain Continental tires sold to the aftermarket for various model year 2018-2021 vehicles. The affected tires were cured for too long during production.
- Risk
- Over cured tires may develop a break in the sidewall resulting in sudden air loss or a belt edge separation which could lead to a tread/belt loss. Either condition can cause a loss of vehicle control, increasing the risk of a crash.
- Remedy
- GM will notify owners, and dealers will inspect the tires, replacing them as necessary, free of charge. The recall began March 22, 2021. Owners may contact GMC customer service at 1‑888‑988‑7267, Buick customer service at 1‑866‑608‑8080, Chevrolet customer service at 1‑800‑222‑1020 or Cadillac customer service at 1‑800‑458‑8006. GM's number for this recall is N212329050.
Recall number 21V115000 · Recall details
Technical service bulletins for the 2020 Chevrolet Express 716
Bulletins tell dealers how to fix known problems. A warranty extension means the manufacturer pays for that repair for longer.
- This service bulletin provides information about GM Accessories
- This PI provides Diagnostics tips on how the LIN bus works and how to diagnosis it.
- This PI communicates the proper part numbers for transmission connectors and internal harness to prevent...
- This preliminary information advises a dealer on how to email GDS2 session logs into Technical Assistance.
- PI to help diagnose A/C concern
- This preliminary information communicates information about how to determine if a wheel and tires size...
- This Preliminary information communicates the steps on how to save a GDS2 Session Log and upload to a...
- This Preliminary information communicates to the field on how to diagnosis a GPS issue with the Telematic...
- This Preliminary information communicates to the field on how to diagnosis a GPS issue with the Telematic...
- This PI Communications information on an alternative product dealers can use to perform 19-NA-255: Wax...
What 2020 Chevrolet Express owners say
Most recent owner complaints, unedited.
The contact owns a 2020 Chevrolet Express. The contact stated that while driving 60 MPH on the highway, the vehicle lost motive power and shuddered abnormally, causing the vehicle to decelerate to 40 MPH. The vehicle was pulled over and restarted; however, the failure persisted. The failure recurred while driving at 40 MPH on several occasions. An independent mechanic was unable to determine the cause of the failure. The vehicle was towed to a dealer, and the contact was informed that the VIN was not associated with the federal safety agency Campaign Number: 24V839000 (POWER TRAIN); and refused to provide a diagnosis without a visible fractured part. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was 98,753.
The contact owns a 2020 Chevrolet Express. The contact stated that while driving at 60 MPH, the vehicle experienced a sudden loss of power and was shuddering while driving on the highway. The vehicle was pulled over to the side of the road and restarted; however, the failure reoccurred shortly afterwards while driving at 15 MPH. The contact stated that the failure had occurred on several occasions. The vehicle was taken to an independent mechanic, but it was not diagnosed. The vehicle was then driven to a dealer, where the contact referenced the federal safety agency Campaign Number: 24V839000 (POWER TRAIN); and associated the issue with the recall; however, the VIN was not included in the recall. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was 100,000.
While driving this cargo van, the driver stopped in traffic to make a left hand turn. In the middle of the turn, the vehicle stalled out and would not immediately start, exposing the vehicle to nearly being hit by the oncoming traffic. When the vehicle eventually restarted, and later brought to a GM dealer for repair, it was discovered that the main ground cable had completely deteriorated. In our fleet of 15 GM vehicles, this is now the SEVENTH vehicle that has needed this main ground cable replaced. This is a serious issue that needs to be addressed.
Door latches on the side rear door need replaced every few months. Dealer charges $1300 to fix this issue on 8 of the 2020 Chevy Expresses that I we own.
Transmission needed replaced at 61,000 miles
Certified mechanic said it needs a transmission.
Transmission needed replaced at 50,000 miles
Transmission issues at 50,00 to 60,000 miles
Catalytic converter cracked at exhaust manifold @5 yrs, 34,600 miles. Known problem, denial, scam warranty allowing them to break ‘clean air act’ and scam customers into paying. On the hook myself for a fed law requiring manufacturers repair. At my shop getting fixed when they offered to fix after my mention of fraud! 3 years of claimed-broken welds in vans (doghouse over motor). I know of 4th year problem. Also not believing bad weld.Engineer friend says stress crack. Weak metal, no support due to flex pipe I believe. Cheap parts, money over safety again. And I have proof they do it and deny, misdiagnose, and lie. Criminal I think. Posting online about warranty scam. I was schooled in auto, small business owner. I know law! Given up on gov I’m sorry to say.
Compare the 2020 Chevrolet Express
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Questions about the 2020 Chevrolet Express
Is the 2020 Chevrolet Express reliable?
Owners have filed 17 complaints about the 2020 Chevrolet Express, close to a typical Express model year.
What is the 2020 Chevrolet Express year score?
The 2020 Chevrolet Express scores 70 out of 100 (average). The score compares it with the other model years of the Chevrolet Express: 75 is a typical year, 50 means twice the usual complaints, and serious complaints and recalls lower it.
What is the most common problem with the 2020 Chevrolet Express?
Transmission and drivetrain, with 9 complaints. Next is body (3).
How many recalls does the 2020 Chevrolet Express have?
1 recall, covering tires.
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