2016-2021 McLaren 570S Window Regulator: Solving the Common Window Drop Glitch
This guide explains the common electronic glitches that cause the window to drop on its own and details what to look for when buying a used replacement regulator.
- The most common issue is an electronic glitch causing the window to drop, often linked to low battery voltage, not mechanical failure.
- A used OEM regulator is the only viable replacement option; aftermarket parts are not compatible with the required electronic calibration.
- The same regulator part (e.g., 13A2047CP for the left side) fits both Coupe and Spider models of the 570S.
- Professional installation is strongly recommended, as replacing the regulator requires a mandatory 'Window Calibration' with a dealer-level diagnostic tool.
Symptoms of Failure
Failures in the McLaren 570S window regulator system are more often electronic than mechanical. While traditional symptoms like grinding noises can occur, the most reported issues are related to software and control glitches.
- Window Drops on Its Own: The most notorious issue is the window dropping halfway or all the way down without user input. This often happens immediately after closing the door or unlocking the car.
- Incorrect Indexing: Instead of dropping slightly when the door handle is pulled, the window may drop completely, or not drop at all. This prevents the door from closing properly or leaves the window open.
- Unresponsive Switch: The window may not respond to the switch on either the driver's or passenger's side. Sometimes, one switch will work while the other does not.
- Failure After Battery Disconnection: Window functions often become erratic after the vehicle's battery has died or been disconnected for service. This is a strong indicator that the system has lost its calibration.
- Grinding or Clicking Noises: This is a classic sign of a mechanical failure within the regulator assembly. You may hear the motor trying to work, but the window doesn't move, or it moves with a loud, unpleasant noise. This points to stripped gears or frayed cables.
- Window is Slow or Crooked: If the window moves much slower than usual or tilts to one side as it goes up or down, the regulator's guide rails may be bent or the cables could be binding.
Known Issues, TSBs, and Recalls
The "Window Drop" Software Glitch
The most prevalent issue for the 570S is not a faulty part, but an electronic quirk. Many owners report the window dropping unexpectedly. This is widely understood to be a software issue within the Door Control Module, which can be triggered by low battery voltage. McLaren vehicles are very sensitive to battery charge; leaving the car off a battery tender for extended periods can lead to numerous electronic gremlins, with the window behavior being a primary one.
A McLaren Service Campaign Bulletin confirms the complexity of this system, noting that a specific "Window Calibration" procedure must be performed with the McLaren Diagnostic System (MDS) after any software updates to the door modules. This indicates that the window's position and limits are stored electronically and can be lost or corrupted.
Pro Tip: Before assuming the regulator is broken, ensure your vehicle's battery is fully charged using a proper battery tender. Many electronic issues on these cars resolve themselves once stable voltage is restored.
Recalls and Service Bulletins
As of now, there are no official NHTSA recalls specifically for the window regulator assembly on the 2016-2021 McLaren 570S. However, the existence of service bulletins related to door module software and window calibration procedures confirms that McLaren is aware of the system's sensitivity.
Buying a Used Window Regulator
For a vehicle like the 570S, a used OEM regulator is the only practical and recommended option. Aftermarket parts are generally not available, and even if they were, they would lack the specific electronic components required to communicate with the car's control modules.
Inspection and Compatibility
- Check Part Numbers: The most reliable way to ensure compatibility is to match the OEM part number. The known part number for the left (driver's side) is 13A2047CP and the right (passenger's side) is likely 13A2053CP.
- Coupe vs. Spider Compatibility: It has been verified that these window regulators fit both the 570S Coupe and Spider models. This is a critical piece of information, as you can confidently purchase a part from either model for your vehicle.
- Physical Inspection: When the part arrives, inspect it carefully. Look for frayed or kinked steel cables, cracks in any of the plastic pulley wheels, and signs of bending or damage on the metal guide rails. Ensure the electrical connector for the motor is clean and free of corrosion.
- The Motor is Key: The regulator is typically sold as a complete assembly with the motor. Do not purchase a regulator without the motor, as the motor contains the electronics that need to be calibrated.
Warning: Remember that installing a used regulator may not solve the 'window drop' glitch if the root cause is software-related. The replacement part will require professional calibration regardless.
Replacement and Calibration
Installation Difficulty: 5 out of 5
Replacing the window regulator in a McLaren 570S is a complex task best left to professionals or highly experienced DIY mechanics. While the mechanical unbolting and swapping of the part is manageable, the process has two major challenges:
- Door Panel Removal: Accessing the regulator requires removing the intricate, multi-piece door panel. 🎬 Watch: How to safely remove the 570S door panel This involves carefully disconnecting sensitive electronics and hidden fasteners without damaging the expensive leather, Alcantara, or carbon fiber trim.
- Mandatory Electronic Calibration: After the new regulator is installed, it must be calibrated using a McLaren Diagnostic System (MDS) or a high-end equivalent tool. 🎬 See how to fix window malfunctions using diagnostic tools This procedure teaches the door control module the window's upper and lower limits, which is essential for the one-touch up/down and door indexing features to work correctly. Skipping this step will almost certainly result in the same erratic behavior you were trying to fix.
| Part Type | Estimated Cost |
|---|---|
| New OEM | $1,000 - $1,500+ (dealer-only part) |
| Used OEM | $200 - $450 |
| New Aftermarket | Not available or recommended |
| Shop Labor | $500 - $1,000 (specialist required) |
Frequently Asked Questions (FAQ)
Will this window regulator fit my 2018 McLaren 570S Spider?
Yes, the front window regulators, including part number 13A2047CP for the left side, are confirmed to fit both the Coupe and Spider versions of the 570S from 2016-2021.
Why does my window drop by itself when I close the door?
This is a well-known electronic glitch with the McLaren Sports Series. It is usually caused by a software issue or, most commonly, by low battery voltage. Before replacing parts, ensure your car's battery is kept on a tender to maintain a full charge.
Can I fix the window dropping issue without replacing the regulator?
Possibly. First, try a full system reset by disconnecting the battery for one hour, then reconnecting it. You can also try the manual reset procedure found in the owner's manual, which typically involves holding the window switch in the full up and down positions for several seconds. 🎬 Watch: A guide to window calibration and switch configuration However, the most reliable fix for persistent electronic issues is having a dealer or specialist perform a 'Window Calibration' with a diagnostic tool.
Does a replacement window regulator need to be programmed?
Yes, absolutely. Any time a window regulator is replaced or the system loses power for an extended time, a 'Window Calibration' procedure must be performed with a McLaren-specific diagnostic tool. This is not optional; it is required for the window to function correctly.
Helpful Videos
Technical Specifications
OEM Part Numbers: 13A2047CP (Front Left) 13A2053CP (Front Right)
Electric regulator and motor assembly with integrated electronics for window indexing and calibration.
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.
- McLaren 570S: