Keyecu Replacement Keyless Entry Remote for Subaru (CWTB1G077, 434MHz H Chip) — Uncut Fob for Ascent Crosstrek Forester Impreza 20

This Keyecu replacement keyless entry remote is an aftermarket fob built to replace remotes using board number CWTB1G077 and a 434MHz H chip when properly cut and programmed.

If your vehicle’s original key uses the CWTB1G077 circuit board and operates at 434MHz, this Keyecu remote is manufactured as a direct-form replacement to restore keyless locking and unlocking. Because aftermarket remotes sometimes lack printed board markings or brand logos, it’s important to confirm your current remote’s internal board number and frequency before ordering. The fob arrives uncut and requires a professional locksmith or dealer to cut the metal blade and program the transponder and remote functions to your vehicle.

How do I confirm this remote will fit my vehicle?

Open your existing key housing and compare the internal remote board number and frequency. The replacement is intended for remotes with the board number CWTB1G077 and operation at 434MHz; if both match, the housing shape and button layout should also align.

• Open original key to locate the board number (CWTB1G077) and frequency marking (434MHz).
• Compare the button count and exterior shape to ensure physical fitment.
• Note: aftermarket boards may arrive without printed numbers or logos—verify your original.

What must a locksmith do to make this remote work?

This replacement remote requires professional cutting of the key blade and programming with a suitable key programmer. A locksmith or dealer will synchronize the remote’s radio transmitter with your vehicle and program the transponder (H chip) into the immobilizer system.

• Have the metal blade cut to your vehicle’s key code or by impressioning.
• Use an appropriate key programmer to register the remote’s 434MHz transmitter.
• Program the transponder chip so the vehicle recognizes the key for ignition.

What are the construction and usability differences compared to an OEM fob?

Keyecu’s aftermarket remote uses durable materials and responsive buttons designed to match OEM function without branding on the case. Expect similar button sensitivity and range, but accept that the exterior case may be unbranded and the internal board sometimes lacks printed identifiers.

• Durable plastic construction for everyday use and pocket-wear resistance.
• Responsive lock/unlock buttons designed for consistent actuation.
• Aftermarket housing may ship without text or logos on the back panel.

What should I check after installation to confirm everything works?

After the locksmith completes cutting and programming, verify lock/unlock range, trunk release (if applicable), and that the vehicle starts using the transponder. Confirm battery seating and button responsiveness before leaving the shop.

• Test locking and unlocking from several distances around the vehicle.
• Confirm the car recognizes the transponder at ignition and starts reliably.
• Inspect button feel and battery compartment closure for secure fit.

Who is this for: This Keyecu replacement remote is best for owners whose original key fob uses the CWTB1G077 remote board and 434MHz H chip, and who are comfortable working with a qualified locksmith or dealership for blade cutting and programming. It’s a practical, cost-effective option for drivers who need a functional, durable aftermarket remote without OEM branding, provided they verify compatibility before purchase.