Table 1 shows one common electrical system related problems of the 2020 Chevrolet Express.
| Problem Category | Number of Problems |
|---|---|
| Electrical System problems |
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.
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.
The contact owns a 2021 jayco redhawk. The contact stated that while inspecting underneath the RV the plumbing hoses and lines as well electrical wires, fuel line from the propane tank, and fuel line from the generator was just lying on the frame. The hoses and lines were not insulated or secured underneath the RV. The contact stated that he was concerned that a fire could have been started. The contact stated that he wire-tied all the wires, so they were not laying on the frame. The vehicle was taken to the dealer who only secured the wires with a single wire tie. The contact stated that many of the wires were still just hanging as the dealer did not repair the problem. The contact stated that the brake, fuel, and electrical harness were all clamped together which could cause a failure. The jayco dealer advised the contact to take the vehicle to a gm dealer for repairs to the chassis. The contact stated he contacted mcgee Chevrolet (1455 new state hwy, raynham, MA 02767) and they stated they could not repair the RV due to the large size. The contact stated that the jayco manufacturer was notified and advised to take the RV to a jayco dealer for repairs. The failure mileage was approximately 1,000.