The power hood, (eTrunk™), available on the 2022-2025 HUMMER EV Pickup; 2024-2025 HUMMER EV SUV; 2024-2025 Silverado RST EV; and 2024-2025 Sierra Denali EV offers secure storage in the front of the truck. (Fig. 11)
Fig. 11
The power hood can be opened and closed using the key fob, the button on the left side of the instrument panel, or the touchpad on the front fascia. Each feature requires a different operating procedure, so it’s important that customers understand the unique functionality of the key fob, instrument panel button and touchpad when operating the power hood.
Operating the eTrunk
Key Fob – To open the power hood using the key fob, press the power hood button twice on the fob. To close, press the power hood button twice on the fob, holding the second press until the hood fully closes. (Fig. 12)
Fig. 12
Instrument Panel Button – To open the power hood from inside the cabin, press the power hood button on the left side of the instrument panel. To close, press and hold the power hood button until the hood fully closes. (Fig. 13)
Fig. 13
Closing the hood is a supervised operation, which requires the user to press and hold the key fob button or instrument panel button until the hood is fully closed. Releasing the button will stop hood motion.
Front Fascia Touchpad – To open or close the power hood at the front of the truck, press the touchpad, located on the center, or right of center (depending on the model), of the front fascia. (Fig. 14) The vehicle must be unlocked or the key fob within range to open the hood at the front of the vehicle.
Fig. 14
To close the hood manually without using the power operation controls, pull down on the hood until the power assist engages and closes the hood the rest of the way. A chime will sound to indicate power assist activation. The power assist will only activate when the hood is above a minimum open position.
Manually forcing the power hood to open or close can damage the vehicle. Always allow the automatic operation to complete before operating the power hood again.
The power hood settings, including a custom hood open angle, can be changed in the Vehicle Settings. Go to Settings > Vehicle > Comfort and Convenience > Power Hood on the infotainment screen to adjust the settings.
Learned Position
Some vehicles may have a Hood Ajar message displayed on the instrument cluster, erratic operation of the power hood, and DTCs B1C8C (Front Closure Position Sensor 2 Signal 1), B1C8D (Front Closure Position Sensor 2 Signal 2), B1C80 (Front Closure Position Sensor Signal 1 Circuit Voltage), B1C81 (Front Closure Position Sensor Signal 2 Circuit Voltage) or P257F (Engine Hood Switch Circuit High) set. These conditions are an indication that the power hood has lost its learned position.
TIP: If the hood is not closed, the electronic drive unit lockout prevents the vehicle from shifting out of Park. Close the hood to shift out of Park. Confirm the hood is closed by checking that the hood is flush with the surrounding components. If the hood is closed but the Hood Ajar message is present, the electronic drive unit lockout can be overridden by applying the brake for 20 seconds and then shifting into Drive. The vehicle will not exceed 26 mph (42 km/h) when the hood is not completely closed.
The K241 Powertrain Compartment Cover Module continuously monitors power front stowage compartment cover operation and calculates its location and direction of travel using two Hall effect sensors that are part of the M145L Hood Power Assist Actuator – Left.
If these conditions are found, remove and reinstall the K241 Powertrain Compartment Cover Module (F54UA) fuse and then perform a relearn of the Powertrain Compartment Cover Module using a scan tool.
Refer to #PIT6202B for additional information.
When calibrating the front stowage compartment cover position, the Powertrain Compartment Cover Module is placed in a functional state to learn the front stowage compartment cover travel limits. DTC B1CB4 54 (Power Front Closure Module Missing Calibration) will set automatically as an indicator that the system is in learn mode, and not as a fault indicator. Once the travel limits are learned by the Powertrain Compartment Cover Module, the module will exit calibration mode and DTC B1CB4 54 will become a history code.
TIP: If the vehicle’s 12V battery has been disconnected, the power hood may fail to operate until certain parameters have been met. After the 12V system is restored, the power hood must be manually operated to the fully closed position with the vehicle on. If the vehicle has lost power, and the hood is open when the power is restored, the power hood and power closing latch will not operate. To allow powered hood operation again, the hood must be manually closed and fully latched.
To open the power hood when there is not any electrical power, pull the hood release cable twice on the lower left side of the instrument panel. (Fig. 15)
Fig. 15
– Thanks to Mark Shearer and Chris Semanisin
