2015-2019 Rolls-Royce Dawn Boot Lid Motor: Diagnosing Power Trunk Failures
This guide covers the symptoms, replacement costs, and what to inspect when buying a used power boot lid motor for your 2015-2019 Rolls-Royce Dawn.
- Replacement is a complex, professional-only job due to the integration with the Dawn's convertible top system; DIY attempts are strongly discouraged.
- Failure is not a common, recalled issue, but symptoms include slow operation, grinding noises, or a complete lack of movement.
- A faulty boot lid motor can prevent the convertible roof from functioning, making it a critical repair.
- Due to high OEM part costs, a quality-inspected used OEM motor is a viable alternative, but must be purchased from a reputable source.
Symptoms of a Failing Boot Lid Motor
A failing boot lid motor on a Rolls-Royce Dawn will typically present several distinct symptoms. Given the vehicle's quiet nature, any unusual noises from the rear will be immediately noticeable.
- Slow or Strained Operation: The boot lid may open or close much slower than it used to. It might seem to struggle or hesitate, especially at the beginning or end of its travel. This indicates a weakening motor or failing support struts.
- Grinding or Clicking Noises: Any grinding, clicking, or whirring sounds during operation are a clear sign of a problem. These noises often point to worn or broken gears inside the motor assembly or a problem with the drive mechanism.
- Failure to Open or Close: The most obvious symptom is a complete failure to operate. You might hear a click from the relay, but the motor itself does not engage. In other cases, the motor might be completely silent, suggesting an electrical issue like a blown fuse, a bad switch, or a dead motor.
- Intermittent Function: The motor may work sometimes but not others. This can be frustrating to diagnose and often points to a failing electrical component within the motor or a loose connection that is affected by temperature or vibration.
- Boot Lid Gets Stuck: The lid may open or close partway and then stop. This can leave the boot partially open and unable to complete its cycle, which is a significant issue on a convertible where weather sealing is paramount.
Known Issues, TSBs, and Recalls
As of mid-2026, there are no specific recalls or Technical Service Bulletins (TSBs) issued by Rolls-Royce or the National Highway Traffic Safety Administration (NHTSA) for widespread failure of the boot lid motor on the 2015-2019 Dawn. Recalls for this vehicle have primarily focused on issues such as side airbag inflators. While general electrical glitches can occur on complex luxury vehicles, the boot lid motor itself does not appear to be a common, systemic problem. Failures are typically isolated incidents related to the age and wear of the individual component.
Warning: The Rolls-Royce Dawn's boot lid is an integral part of the convertible top system. A malfunctioning boot lid can prevent the roof from opening or closing. Do not force the boot lid if it fails, as this could damage the far more expensive and complex roof mechanism.
Buying a Used Tailgate Lift Motor
Due to the extremely high cost of new OEM parts for a Rolls-Royce, a quality used motor can be a sensible alternative. However, careful inspection is critical.
- Verify the Part Number: Whenever possible, match the part number from your original motor to the used unit. A part number associated with this component is 51247211168, listed as a "trunk closing motor drive unit". Always confirm fitment with the seller, as parts can vary based on vehicle options.
- Physical Inspection: Check the motor's casing for any cracks, corrosion, or signs of water intrusion. Moisture is a major cause of failure for electrical components located in the trunk area. Ensure all electrical connectors are clean, straight, and free of corrosion.
- Check the Gearing: If possible, try to manually move the drive gear or arm. It should move smoothly, without any grinding or binding that would indicate internal damage.
- Source and Mileage: Purchase from a reputable recycler that provides the VIN and mileage of the donor vehicle. A motor from a lower-mileage, accident-free vehicle is always preferable. Avoid parts from flood-damaged cars at all costs.
- Why Used OEM is a Good Choice: For a vehicle like the Dawn, there are virtually no new aftermarket options. A used OEM motor was built to Rolls-Royce's original standards of quality and fitment. It is designed to integrate perfectly with the car's complex electronics, avoiding the compatibility issues that could arise from a non-existent aftermarket part.
Cost & Replacement Info
Replacing the boot lid motor on a Rolls-Royce Dawn is a complex task that should be left to a qualified technician specializing in luxury British vehicles.
Pro Tip: The boot lid mechanism is intertwined with the convertible top's operation. Improper removal or installation can trigger fault codes or damage other systems. A technician will need to use diagnostic tools to properly calibrate the new motor and ensure it communicates correctly with the vehicle's body control module.
| Part/Service | Estimated Cost |
|---|---|
| New OEM Motor | $2,000 - $4,000+ (estimate based on comparable vehicles and repair data) |
| New Aftermarket Motor | Not Available |
| Used OEM Motor | $500 - $1,200+ |
| Shop Labor | $600 - $1,200+ (estimated 3-5 hours at a specialist rate of $200-$250/hr) |
Note: Prices are estimates as of late 2026 and can vary significantly based on location, supplier, and the specific part required. The cost of a new OEM motor is difficult to pinpoint without a direct quote from a Rolls-Royce dealer, but repair data for a damaged "convertible trunk cover" on a 2017 Dawn exceeded $17,000 for the assembly, indicating the high cost of these parts.
Frequently Asked Questions
Can I replace the Dawn's boot lid motor myself?
This is not recommended for a DIY mechanic. The procedure requires removing significant interior trim, handling complex electrical connectors, and potentially calibrating the new motor with specialized diagnostic software. The risk of damaging the boot lid, its alignment, or the interconnected convertible top mechanism is very high. This job is best left to a professional technician. The installation difficulty is rated 5 out of 5.
Can I just open and close the trunk manually if the motor fails?
Possibly, but it is not advised. If the motor or latch has failed in a locked state, you may not be able to open it at all. Forcing it could cause significant damage. If the motor fails but the latch releases, you may be able to lift it, but you should not slam it shut. The system is not designed for repeated manual force. The primary risk is that a malfunctioning boot lid system can prevent the convertible top from operating.
Could a weak battery cause the boot lid motor to fail?
Yes. A weak or dying battery can cause various electrical issues on a modern Rolls-Royce. The boot lid motor requires significant power to operate. If you notice slow operation, it's wise to have your battery and charging system tested before assuming the motor itself is the sole cause of the problem.
Is a clicking sound always the motor?
Not necessarily. A single click when you press the button is often the sound of a relay sending power to the motor. If you hear a click but the motor doesn't run, the problem could be the motor itself, the wiring to the motor, or a mechanical jam. A series of rapid clicks or a grinding noise, however, is more indicative of a problem inside the motor assembly.
Technical Specifications
OEM Part Numbers: 51247211168
12V Electric Motor Drive Unit
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Rolls-Royce Dawn: