Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2021 Mercedes Benz GLS450FACTORY OEM SERVICE PROCEDURE
DTC Index - Fuel Controls (FSCM_Gen5): Application
FUEL CONTROL APPLICATIONS (FSCM_GEN5)
| Model | Chassis Code | Engine Code | Transmission Code | Model Year | Control Module |
|---|---|---|---|---|---|
| AMG A35 | 177.151 | 260.920 | 724.0 | 2020 | FSCM_GEN5 |
| AMG A35 | 177.151 | 260.920 | 724.0 | 2021 | FSCM_GEN5 |
| AMG CLA 35 | 118.351 | 260.920 | 724.0 | 2020 | FSCM_GEN5 |
| AMG CLA 35 | 118.351 | 260.920 | 724.0 | 2021 | FSCM_GEN5 |
| AMG CLA 35 | 118.351 | 260.920 | 724.0 | 2022 | FSCM_GEN5 |
| AMG CLA 35 | 118.351 | 260.920 | 724.0 | 2023 | FSCM_GEN5 |
| AMG CLA 45 | 118.353 | 139.980 | 724.1 | 2020 | FSCM_GEN5 |
| AMG CLA 45 | 118.353 | 139.980 | 724.1 | 2021 | FSCM_GEN5 |
| AMG CLA 45 | 118.353 | 139.980 | 724.1 | 2022 | FSCM_GEN5 |
| AMG CLA 45 | 118.353 | 139.980 | 724.1 | 2023 | FSCM_GEN5 |
| AMG GLA 35 4M | 247.751 | 260.920 | 724.1 | 2021 | FSCM_GEN5 |
| AMG GLA 35 4M | 247.751 | 260.920 | 724.1 | 2022 | FSCM_GEN5 |
| AMG GLA 35 4M | 247.751 | 260.920 | 724.1 | 2023 | FSCM_GEN5 |
| AMG GLA 35 4M | 247.751 | 260.920 | 724.1 | 2024 | FSCM_GEN5 |
| AMG GLA 35 4M | 247.751 | 260.920 | 724.1 | 2025 | FSCM_GEN5 |
| AMG GLA 45 4M | 247.753 | 139.980 | 724.1 | 2021 | FSCM_GEN5 |
| AMG GLA 45 4M | 247.753 | 139.980 | 724.1 | 2022 | FSCM_GEN5 |
| AMG GLA 45 4M | 247.753 | 139.980 | 724.1 | 2023 | FSCM_GEN5 |
| AMG GLB 35 4M | 247.651 | 260.920 | 724.1 | 2021 | FSCM_GEN5 |
| AMG GLB 35 4M | 247.651 | 260.920 | 724.1 | 2022 | FSCM_GEN5 |
| AMG GLB 35 4M | 247.651 | 260.920 | 724.1 | 2023 | FSCM_GEN5 |
| AMG GLB 35 4M | 247.651 | 260.920 | 724.1 | 2024 | FSCM_GEN5 |
| AMG GLB 35 4M | 247.651 | 260.920 | 724.1 | 2025 | FSCM_GEN5 |
| AMG GLE 53 4M | 167.161 | 256.930 | 725. 0 | 2021 | FSCM_GEN5 |
| AMG GLE 53 4M | 167.161 | 256.930 | 725. 0 | 2022 | FSCM_GEN5 |
| AMG GLE 53 4M | 167.161 | 256.930 | 725. 0 | 2023 | FSCM_GEN5 |
| AMG GLE 53 4M coupe | 167.361 | 256.930 | 725. 0 | 2021 | FSCM_GEN5 |
| AMG GLE 53 4M coupe | 167.361 | 256.930 | 725. 0 | 2022 | FSCM_GEN5 |
| AMG GLE 53 4M coupe | 167.361 | 256.930 | 725. 0 | 2023 | FSCM_GEN5 |
| AMG GLE 63 'S' 4M | 167.189 | 177.980 | 725. 0 | 2021 | FSCM_GEN5 |
| AMG GLE 63 'S' 4M | 167.189 | 177.980 | 725. 0 | 2022 | FSCM_GEN5 |
| AMG GLE 63 'S' 4M | 167.189 | 177.980 | 725. 0 | 2023 | FSCM_GEN5 |
| AMG GLE 63 'S' 4M | 167.189 | 177.980 | 725. 0 | 2024 | FSCM_GEN5 |
| AMG GLE 63 'S' 4M coupe | 167.389 | 177.980 | 725. 0 | 2021 | FSCM_GEN5 |
| AMG GLE 63 'S' 4M coupe | 167.389 | 177.980 | 725. 0 | 2022 | FSCM_GEN5 |
| AMG GLE 63 'S' 4M coupe | 167.389 | 177.980 | 725. 0 | 2023 | FSCM_GEN5 |
| AMG GLE 63 'S' 4M coupe | 167.389 | 177.980 | 725. 0 | 2024 | FSCM_GEN5 |
| AMG GLS 63 4M | 167.989 | 177.980 | 725.0 | 2020 | FSCM_GEN5 |
| AMG GLS 63 4M | 167.989 | 177.980 | 725.0 | 2021 | FSCM_GEN5 |
| AMG GLS 63 4M | 167.989 | 177.980 | 725.0 | 2022 | FSCM_GEN5 |
| AMG GLS 63 4M | 167.989 | 177.980 | 725.0 | 2023 | FSCM_GEN5 |
| AMG GLS 63 4M | 167.989 | 177.980 | 725.0 | 2024 | FSCM_GEN5 |
| AMG GLS 63 4M | 167.989 | 177.980 | 725.0 | 2025 | FSCM_GEN5 |
| A 220 | 177.144 | 260.920 | 724.0 | 2019 | FSCM_GEN5 |
| A 220 | 177.144 | 260.920 | 724.0 | 2020 | FSCM_GEN5 |
| A 220 | 177.144 | 260.920 | 724.0 | 2021 | FSCM_GEN5 |
| A 220 | 177.144 | 260.920 | 724.0 | 2022 | FSCM_GEN5 |
| A 220 4M | 177.145 | 260.920 | 724.0 | 2019 | FSCM_GEN5 |
| A 220 4M | 177.145 | 260.920 | 724.0 | 2020 | FSCM_GEN5 |
| A 220 4M | 177.145 | 260.920 | 724.0 | 2021 | FSCM_GEN5 |
| A 220 4M | 177.145 | 260.920 | 724.0 | 2022 | FSCM_GEN5 |
| C 300 | 205.083 | 264.920 | 725. 0 | 2019 | FSCM_GEN5 |
| C 300 | 205.083 | 264.920 | 725. 0 | 2020 | FSCM_GEN5 |
| C 300 | 205.083 | 264.920 | 725. 0 | 2021 | FSCM_GEN5 |
| C 300 4M | 205.084 | 264.920 | 725. 0 | 2019 | FSCM_GEN5 |
| C 300 4M | 205.084 | 264.920 | 725. 0 | 2020 | FSCM_GEN5 |
| C 300 4M | 205.084 | 264.920 | 725. 0 | 2021 | FSCM_GEN5 |
| CLA 250 | 118.346 | 260.920 | 724.0 | 2020 | FSCM_GEN5 |
| CLA 250 | 118.346 | 260.920 | 724.0 | 2021 | FSCM_GEN5 |
| CLA 250 | 118.346 | 260.920 | 724.0 | 2022 | FSCM_GEN5 |
| CLA 250 | 118.346 | 260.920 | 724.0 | 2023 | FSCM_GEN5 |
| CLA 250 4M | 118.347 | 260.920 | 724.0 | 2020 | FSCM_GEN5 |
| CLA 250 4M | 118.347 | 260.920 | 724.0 | 2021 | FSCM_GEN5 |
| CLA 250 4M | 118.347 | 260.920 | 724.0 | 2022 | FSCM_GEN5 |
| CLA 250 4M | 118.347 | 260.920 | 724.0 | 2023 | FSCM_GEN5 |
| GLA 250 | 247.746 | 260.920 | 724. 1 | 2021 | FSCM_GEN5 |
| GLA 250 | 247.746 | 260.920 | 724. 1 | 2022 | FSCM_GEN5 |
| GLA 250 | 247.746 | 260.920 | 724. 1 | 2023 | FSCM_GEN5 |
| GLA 250 | 247.746 | 260.920 | 724. 1 | 2024 | FSCM_GEN5 |
| GLA 250 | 247.746 | 260.920 | 724. 1 | 2025 | FSCM_GEN5 |
| GLA 250 4M | 247.747 | 260.920 | 724. 1 | 2021 | FSCM_GEN5 |
| GLA 250 4M | 247.747 | 260.920 | 724. 1 | 2022 | FSCM_GEN5 |
| GLA 250 4M | 247.747 | 260.920 | 724. 1 | 2023 | FSCM_GEN5 |
| GLA 250 4M | 247.747 | 260.920 | 724. 1 | 2024 | FSCM_GEN5 |
| GLA 250 4M | 247.747 | 260.920 | 724. 1 | 2025 | FSCM_GEN5 |
| GLB 250 | 247.646 | 260.920 | 724.1 | 2020 | FSCM_GEN5 |
| GLB 250 | 247.646 | 260.920 | 724.1 | 2021 | FSCM_GEN5 |
| GLB 250 | 247.646 | 260.920 | 724.1 | 2022 | FSCM_GEN5 |
| GLB 250 | 247.646 | 260.920 | 724.1 | 2023 | FSCM_GEN5 |
| GLB 250 | 247.646 | 260.920 | 724.1 | 2024 | FSCM_GEN5 |
| GLB 250 | 247.646 | 260.920 | 724.1 | 2025 | FSCM_GEN5 |
| GLB 250 4M | 247.647 | 260.920 | 724.1 | 2020 | FSCM_GEN5 |
| GLB 250 4M | 247.647 | 260.920 | 724.1 | 2021 | FSCM_GEN5 |
| GLB 250 4M | 247.647 | 260.920 | 724.1 | 2022 | FSCM_GEN5 |
| GLB 250 4M | 247.647 | 260.920 | 724.1 | 2023 | FSCM_GEN5 |
| GLB 250 4M | 247.647 | 260.920 | 724.1 | 2024 | FSCM_GEN5 |
| GLB 250 4M | 247.647 | 260.920 | 724.1 | 2025 | FSCM_GEN5 |
| GLE 350 | 167.148 | 264.920 | 725. 0 | 2020 | FSCM_GEN5 |
| GLE 350 | 167.148 | 264.920 | 725. 0 | 2021 | FSCM_GEN5 |
| GLE 350 | 167.148 | 264.920 | 725. 0 | 2022 | FSCM_GEN5 |
| GLE 350 | 167.148 | 264.920 | 725. 0 | 2023 | FSCM_GEN5 |
| GLE 350 4M | 167.149 | 264.920 | 725. 0 | 2020 | FSCM_GEN5 |
| GLE 350 4M | 167.149 | 264.920 | 725. 0 | 2021 | FSCM_GEN5 |
| GLE 350 4M | 167.149 | 264.920 | 725. 0 | 2022 | FSCM_GEN5 |
| GLE 350 4M | 167.149 | 264.920 | 725. 0 | 2023 | FSCM_GEN5 |
| GLE 450 4M | 167.159 | 256.930 | 725. 0 | 2020 | FSCM_GEN5 |
| GLE 450 4M | 167.159 | 256.930 | 725. 0 | 2021 | FSCM_GEN5 |
| GLE 450 4M | 167.159 | 256.930 | 725. 0 | 2022 | FSCM_GEN5 |
| GLE 450 4M | 167.159 | 256.930 | 725. 0 | 2023 | FSCM_GEN5 |
| GLE 580 4M | 167.186 | 176.980 | 725. 0 | 2020 | FSCM_GEN5 |
| GLE 580 4M | 167.186 | 176.980 | 725. 0 | 2021 | FSCM_GEN5 |
| GLE 580 4M | 167.186 | 176.980 | 725. 0 | 2022 | FSCM_GEN5 |
| GLE 580 4M | 167.186 | 176.980 | 725. 0 | 2023 | FSCM_GEN5 |
| GLS 450 4M | 167.959 | 256.930 | 725.0 | 2020 | FSCM_GEN5 |
| GLS 450 4M | 167.959 | 256.930 | 725.0 | 2021 | FSCM_GEN5 |
| GLS 450 4M | 167.959 | 256.930 | 725.0 | 2022 | FSCM_GEN5 |
| GLS 450 4M | 167.959 | 256.930 | 725.0 | 2023 | FSCM_GEN5 |
| GLS 580 4M | 167.986 | 176.980 | 725.0 | 2020 | FSCM_GEN5 |
| GLS 580 4M | 167.986 | 176.980 | 725.0 | 2021 | FSCM_GEN5 |
| GLS 580 4M | 167.986 | 176.980 | 725.0 | 2022 | FSCM_GEN5 |
| GLS 580 4M | 167.986 | 176.980 | 725.0 | 2023 | FSCM_GEN5 |
| Mercedes-Maybach GLS 600 4M | 167.987 | 177.980 | 725.0 | 2020 | FSCM_GEN5 |
| Mercedes-Maybach GLS 600 4M | 167.987 | 177.980 | 725.0 | 2021 | FSCM_GEN5 |
| Mercedes-Maybach GLS 600 4M | 167.987 | 177.980 | 725.0 | 2022 | FSCM_GEN5 |
| Mercedes-Maybach GLS 600 4M | 167.987 | 177.980 | 725.0 | 2023 | FSCM_GEN5 |
| Mercedes-Maybach GLS 600 4M | 167.987 | 177.980 | 725.0 | 2024 | FSCM_GEN5 |
| Mercedes-Maybach GLS 600 4M | 167.987 | 177.980 | 725.0 | 2025 | FSCM_GEN5 |
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.