RennTech Performance ECU+ Upgrade For Mercedes-Benz C253 GLC 63 AMG - AutoTalent }
RennTech Performance ECU+ Upgrade For Mercedes-Benz C253 GLC 63 AMG S - AutoTalent }
RennTech Performance ECU+ Upgrade For Mercedes-Benz GLC 63 AMG S - AutoTalent }
RennTech Performance ECU+ Upgrade For Mercedes-Benz GLC 63 AMG - AutoTalent }
RennTech Performance ECU+ Tune For Mercedes-Benz C253 GLC 63 AMG S - AutoTalent }
RennTech Performance ECU+ Tune For Mercedes-Benz C253 GLC 63 AMG - AutoTalent }
Description: RennTech HHT (hand held tuner) allows you the unlimited ability to switch between tuned and stock ECU...
Vendor: RennTech
SKU: 54.253C.GLC63BT
Product Type: Performance
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Subtotal: $2,980.00
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RennTech HHT (hand held tuner) allows you the unlimited ability to switch between tuned and stock ECU programming and requires no ECU removal. RennTech proprietary tuning module stores both the RennTech tuned file and your vehicles stock file. The module plugs directly into the OBD2 port and delivers the file you choose directly to the ECU. Programming takes only a few minutes and the vehicle can be reflashed at any time as many times as you wish.

RennTech has been at the forefront of ECU tuning since electronic engine management started to show up in vehicles during the mid 1980s. RennTech experience, countless hours of in-house research, development and exhaustive testing ensure that our proprietary ECU upgrade offers incredible performance gains and rock solid daily driver reliability.

RennTech tuning software for Mercedes offers significant gains in horsepower and torque across the vehicle's entire power band. By modifying ignition timing and throttle mapping, optimizing air-to-fuel ratios, increasing the engine's rev limiter and modifying boost mapping for turbo-charged vehicles, RENNtech performance software unleashes the true potential of your Mercedes.

With the proprietary RENNtech ECU Plus Upgrade the C253 - GLC 43 AMG SUV gains up to +41 HP and +62 LB-FT, based on power numbers measured by RENNtech. Please note that the Mercedes M276 engine performance when measured, obtains higher numbers than rated from factory. The maximum power number reached with the RENNtech ECU Plus Upgrade for the X253 - GLC 43 AMG SUV is 416 HP and 460 LB-FT.

All RennTech HSMs are adjustable via USB using either Windows or Android OS.The software allows the user to adjust the ride-height at each corner in 1mm increments independently. The software also has three locations where the user can store pre-configured suspension setups for quick changes.


RENNtech stock power numbers are measured with the GLC 63 AMG. Tune is compatible with GLC 63 AMG and GLC 63 S AMG. Maximum power numbers are for both, S and non-S models.

We have found the M177 engine stock performance numbers vary from the baseline figures claimed by Mercedes-Benz. We typically see higher baseline numbers than claimed by the factory.

Power gains are calculated based on stock numbers measured by RENNtech. Crank Performance Numbers are calculated with a 16% Drivetrain loss on 4MATIC+ vehicles.

Numbers published by MBUSA are an average over a 750rpm range for HP and a 2,750rpm range for TQ. Power gains are calculated based on the peak stock performance measured by RENNtech.

Our numbers will be dependent on conditions and fuel quality. 93+ Octane gasoline is mandatory with this Performance Upgrade.

States known for poor fuel quality have to be supplied with a lower power setup


  • Gains: +75 HP & +113 LB-FT
  • Long-lasting and driver reliability
  • Significant gains in horsepower
  • Increases the performance
  • Significant gains torque 
  • Increasing the engine's rev limiter
  • Incredible performance gains

Stock Performance:

  • 469 HP @ 5,500-6,250rpm; 479 LB-FT @ 1,750-4,500rpm
  • 526 HP @ 6,250rpm; 532 LB-FT @ 4,600rpm

Modified Performance:

  • 601 HP @ 5,500rpm; 645 LB-FT @ 4,600rpm
  • 505 whp @ 5,600rpm; 542 wtq @ 4,600rpm

      Performance Graph:

      Vehicle Fitment:    

      • 2016 Mercedes-Benz C253 GLC 63 AMG
      • 2017 Mercedes-Benz C253 GLC 63 AMG
      • 2018 Mercedes-Benz C253 GLC 63 AMG
      • 2019 Mercedes-Benz C253 GLC 63 AMG
      • 2020 Mercedes-Benz C253 GLC 63 AMG
      • 2016 Mercedes-Benz C253 GLC 63 AMG S
      • 2017 Mercedes-Benz C253 GLC 63 AMG S
      • 2018 Mercedes-Benz C253 GLC 63 AMG S
      • 2019 Mercedes-Benz C253 GLC 63 AMG S
      • 2020 Mercedes-Benz C253 GLC 63 AMG S


                                Images are for representation purpose only and may differ depending on application.

                                  If you have any fitment questions, please feel free to reach out to our team via the contact methods below. If you are contacting us for any order status updates, please give us a call, or email us. We are a lean operation bringing you the best shopping experience possible. We are working on your orders as quickly as we can. We thank you for your patience.

                                  Please reach out to us at (310) 231-0292 for sales inquiries if you are in the United States, Canada, Mexico.
                                  For more in-depth product questions, fitment questions, product inquiries please email our performance specialists at
                                  All other inquiries:
                                  Please direct your inquiries to the chat functionality on our website.

                                  Returns Policy

                                  If a product is ordered and not wanted, the UNUSED item can be returned for a 25% restocking fee unless otherwise specified. In some cases, we may offer the ability to return the item to us for a lesser restocking fee and then keep the balance as a store credit. To return an item, it must be in brand new condition with original packaging.

                                  We cannot accept a return on special ordered or custom items.

                                  Shipping is non refundable in either direction unless approved by AutoTalent. All items wanting to be return MUST be reported within 30 days of the original invoice date. No items will be returnable after 30 days. All products shipped from the AutoTalent facility are shipped via FedEx, USPS, or USPS. Some packages shipped from the manufacturer may or may not require signatures for package release.

                                  Special Order Items

                                  Some items may be special order specifically for the customer’s vehicle. These items generally require a deposit or paid in full. Once this deposit amount is notified to the customer and they agree to order the special order item, the deposit becomes non-refundable. These special order items cannot be returned or resold. Cancellations are not allowed on special order parts.

                                  AutoTalent DOES NOT REFUND SHIPPING CHARGES. If you modify, install, or alter the item in any form, we cannot accept it as a return. We will not cover any expenses related to the product or installation, and you may be required to purchase a replacement.

                                  ** All cancellations that are requested that are NOT due to items not being in stock or delayed by the manufacturer are subject to a 5% processing fee. When you place an order with us we pay credit card fees that are NOT returned back to us. We will absorb these fees if we do not have the item in stock OR if you agree to the original ETA and that ETA is NOT met. If you decide to cancel for any other reason you will not receive this 5% fee back


                                  We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.

                                  When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

                                  Please also note that the shipping rates for many items we sell are weight-based.


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