My 2015 Mercedes-Benz GL63 AMG has suffered two separate ECU failures caused by oil migrating through the engine wiring harness. The first failure occurred at ~42,600 miles in 2020, and the second at ~59,000 miles in 2023. Both times, the vehicle developed misfires, check-engine warnings, and drivability issues that could have led to stalling at highway speeds. On both occasions, the vehicle has been completely disabled. Repairs required replacement of the wiring harness, ECU, sensors, and fuse box, costing over $5,600. This is a hidden, recurring defect that poses a safety risk and financial burden. The vehicle does not feel safe or reliable to drive, and dealer support and guidance is non-existent. I have been afraid to drive to the point that it has only accumulated 3,000 additional miles in the last two years.
The worst 2015 Mercedes-Benz AMG GL63 problems
Ranked by number of owner complaints. Mileage and cost come from what owners wrote.
- Electrical2
- Engine2
Problems by type
Tap a problem to see which part fails, at what mileage and in which other years.
- Electrical2
- Engine2
Recalls 3
Communication
- What is wrong
- Mercedes-Benz USA, LLC. (MBUSA) is recalling certain 2013-2017 vehicles due to a software fault that may cause the date and time for the emergency call system (eCall) to differ from the actual date and time, potentially relaying an inaccurate vehicle location. For a full list of the affected models visit:
- Risk
- An inaccurate vehicle location may delay emergency responders, increasing the risk of injury.
- Remedy
- MBUSA has initiated an Over the Air (OTA) remote update. MBUSA will also notify owners, and dealers will check software for a successful OTA or update the communication module software as needed, free of charge. The recall began December 23, 2019. Owners may contact MBUSA customer service at 1‑800‑367‑6372. MBUSA's number for this recall is 2019120008.
Recall number 19V787000 · Recall details
Suspension: front
- What is wrong
- Mercedes-Benz USA, LLC. (MBUSA) is recalling certain 2012-2014 ML350 Bluetec 4Matic and ML550 4Matic, 2012-2015 ML63 AMG 4Matic and ML350 4Matic, 2013-2016 GL350 Bluetec 4Matic, GL550 4Matic and GL63 AMG 4Matic, 2017 GLS350d 4Matic, GLS450 4Matic, GLS550 4Matic and GLS63 AMG 4Matic, 2015 ML400 4Matic, 2016 GLE400 4Matic, GLE350 4Matic, GLE63 AMG 4Matic, GLE63S AMG 4Matic, GLE450 4Matic Coupe and GLE63S AMG 4Matic Coupe, 2015-2016 GL450 4Matic and 2013-2014 GL450 4Matic vehicles equipped with the Active Curve System (ACS). In certain driving conditions, if the oil level in the ACS reservoir is below the minimum level, the oil may foam and leak out of the vent holes in the reservoir cap.
- Risk
- The leaking oil in the presence of an ignition source can increase the risk of a fire.
- Remedy
- MBUSA will notify owners, and dealers will correct the oil level as necessary and replace the reservoir sealing cap to prevent oil foam from leaking out, free of charge. The recall began August 30, 2018. Owners may contact MBUSA customer service at 1‑800‑367‑6372. MBUSA's number for this recall is 2018070015.
Recall number 18V272000 · Recall details
Power train: axle assembly: axle shaft
- What is wrong
- Mercedes-Benz USA, LLC. (MBUSA) is recalling certain model year 2015 GL350 4Matic Blutec, GL450 4Matic, GL550 4Matic, ML250 Blutec, ML350, ML350 4Matic, ML400 4Matic and 2015-2016 GL63 AMG 4Matic vehicles manufactured September 29, 2014 through March 27, 2015. The affected vehicles have axle bolts on the front and/or rear drive axle carriers that may not have been assembled correctly. As a result, the remaining bolts may fracture.
- Risk
- If any of the remaining front or rear axle bolts fracture, the vehicle may be unstable, reducing the handling capability and increasing the risk of a crash.
- Remedy
- MBUSA will notify owners, and dealers will replace the axle carrier bolts, free of charge. The recall is began February 2017. Owners may contact MBUSA customer service at 1‑800‑367‑6372.
Recall number 16V900000 · Recall details
Technical service bulletins for the 2015 Mercedes-Benz AMG GL63 85
Bulletins tell dealers how to fix known problems. A warranty extension means the manufacturer pays for that repair for longer.
- In our continuing efforts to ensure the proper performance of Mercedes-Benz products and to enhance the...
- Engine
- Visibility/wiper
- Repeat workshop visit for vehicle vibration while braking from 60MPH. NOTE: Although the symptom is...
- Clanking noise from the area of the speakers in the doors
- During part of the steering movement, it feels heavier or more difficult to steer in the same spot every time
- A popup is seen on the HU with the message "data connection temporarily not available". Potentially...
- Single throttle lift-off clunking noise from the side shaft when moving off (audible at the outboard end)
- Creaking noise, in irregular sequence when driving slowly in combination with slight steering movements...
- The customer requests deactivation of the N112/9 HERMES communication module Note: Deactivation of the...
What 2015 Mercedes-Benz AMG GL63 owners say
Most recent owner complaints, unedited.
The vehicle misfired while driving on city streets and presented a code for faulty ignition coils. Upon inspection, mercedes-benz service center found oil in the engine wiring harness rendering the car undriveable.
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Questions about the 2015 Mercedes-Benz AMG GL63
Is the 2015 Mercedes-Benz AMG GL63 reliable?
Owners have filed 2 complaints about the 2015 Mercedes-Benz AMG GL63, close to a typical AMG GL63 model year.
What is the most common problem with the 2015 Mercedes-Benz AMG GL63?
Electrical system, with 2 complaints. Next is engine (2).
How many recalls does the 2015 Mercedes-Benz AMG GL63 have?
3 recalls, covering communication, suspension and power train.
Was there a recall on the 2015 Mercedes-Benz AMG GL63 electrical?
Yes, 1 recall: 19V787000. Check your VIN to see if your car still needs the free repair.
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