Diag Enable Code New 2025 – Full List for All Smartphone Brands
Diag Enable Code New 2025 – Full List for All Smartphone Brands
Diag Mode (short for Diagnostic Mode) is a hidden function built into most modern smartphones.
When enabled, it allows advanced service software—such as HCU Tool, OptuPlus, QPST, and similar utilities—to communicate directly with the device.
This mode is widely used by technicians for tasks such as:
- IMEI repair
- Network unlocking
- Hardware testing and calibration
Enabling Diag Mode opens the diagnostic port, letting your PC access low-level device functions. The good news? For most phones, you can do this without rooting or flashing firmware.
Complete List of Diag Enable Codes (Updated 2025)
The table below contains the latest working Diag Mode codes for Huawei, Vivo, Motorola, Samsung, Xiaomi, OnePlus, and more. Follow the “Code / Steps” column carefully, as some models require accessing hidden engineering menus.
| Brand / Model | Code / Steps | Extra Info |
|---|---|---|
| Huawei | ##2846579## → Project Menu > Background Settings > Manufacture |
Open port via HCU Tool or OptuPlus |
| Vivo | *#585#, *#588#, ##558# → Quality Verification Test > Diagnostic Port |
Works on most Vivo models |
| Motorola | Motorola Menu > Enable Diag [Factory Enabled] | May require service menu access |
| OnePlus | *#801#, *#8011# OR CDMA/LTE > VoLTE > OnePlus Open Diag Menu > RNDIS + Diag Switch ON |
Works on OxygenOS & ColorOS builds |
| LT Mobile | CDMA/LTE > VoLTE > LT Open Diag Menu | Used for CDMA/LTE testing |
| China Mobile | ##717717## |
Some models require engineering mode enabled |
| Samsung (Sprint) | ##3424# |
Opens Sprint Diag Menu |
| Samsung (Verizon/USC) | ##3666333# |
For Verizon & US Cellular models |
| Samsung (Others) | *#0808# |
Opens USB settings menu |
| Xiaomi / Redmi | ##717717##, ##13491## OR Enable Diag in engineering settings |
Works on MIUI-based devices—see Xiaomi Flash Tool |
| Lenovo | ##8899## |
Opens Lenovo service mode |
| ZTE | *#7678# OR Enable Hidden Menu: ZTEOPENEM# (983673636#) → Quick Pop-Up → 98387274# OR CDMA/LTE > VoLTE > ZTE Open Diag Menu |
Multiple access methods available |
| LG | Open Diag Menu OR *#546368#*model# OR ##7262626## |
Sprint & other variants supported |
| OPPO | *#801# → Enable Engineer Mode Toggle |
Works on ColorOS—works great with OPPO Unlock Tools |
How to Enable Diag Mode
1) Open your phone’s dialer app.
2) Enter the code from the table above (include all # and * symbols).
3) When the service menu appears, look for:
- Diag Mode
- USB Settings
- Engineering Mode
4) Select Diagnostic Port or similar.
5) Connect your phone to your PC with a USB data cable and launch your service tool (e.g., Android Utility Tool, DFT Pro).
Important Warnings & Tips
- Regional and Carrier Restrictions: Some codes only work on specific firmware versions or regions.
- Risk of Misconfiguration: Changing wrong settings in service mode may cause network issues or hardware malfunctions.
- Legal Compliance: In many countries, IMEI repair and certain network unlocks are regulated or illegal—always check your local laws.
- Extra Tools Needed: For brands like Huawei and Xiaomi, additional software tools such as HCU Tool or Xiaomi Service Tool may be required to fully activate the port.
Why These Codes Are Useful for Technicians
For mobile repair shops and advanced users, knowing the correct Diag Enable Code can save hours of work. Instead of flashing special firmware, you can quickly open the diagnostic port, connect to service software, and perform:
- Baseband repairs
- Carrier unlocks using tools like SamKey
- Modem calibration
- NV data backup/restore
By keeping this updated list handy, you’ll be ready to work on almost any phone in 2025.
Pro Tip: Bookmark this page or print the table so you have it ready for on-the-spot repairs. For the latest flashing and unlocking utilities, check the Mobile Repair Tools Download Section.
Article written and published by SoftwareCrushs.com
Tested by SoftwareCrushs.com Team
Tested by SoftwareCrushs.com Team
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Deepak Potalwad
The author of SoftwareCrushs.com is a skilled mobile repair technician with years of hands-on experience in Android repair, firmware flashing, IMEI repair, FRP bypass, and mobile unlocking. excited about making mobile software solutions easy for everyone, we create step-by-step mobile repairing tutorials, tool downloads, and fixes for software issues on popular brands like Samsung, Xiaomi, Oppo, Vivo, Realme, and more. facebook twitter youtube instagram
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